Dentistry Uncensored with Howard Farran
Dentistry Uncensored with Howard Farran
How to perform dentistry faster, easier, higher in quality and lower in cost.
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766 Easier, Faster, and Better with Densen B. Cao, PhD : Dentistry Uncensored with Howard Farran

766 Easier, Faster, and Better with Densen B. Cao, PhD : Dentistry Uncensored with Howard Farran

7/11/2017 10:02:36 AM   |   Comments: 0   |   Views: 319

766 Easier, Faster, and Better with Densen B. Cao, PhD : Dentistry Uncensored with Howard Farran

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Densen Cao, PhD, is founder and CEO of the CAO Group, Inc. in West Jordon/UT and engages in research, development, manufacturing, marketing and sales of products in Medical, Dental, Veterinary, Forensic, and LED lighting. Since year 2000, Dr. Cao has lead the company organically grown into a global company and has created many innovative technologies and products in engaged fields to serve its global customers. 

Dr. Cao is the inventor of more than 160 issued and pending patents and published more than 20 technical papers. 

Dr. Cao came to United States in 1986 from China to pursue PhD degree at University of Utah. Before founding the CAO Group, Inc. in year 2000, Dr. Cao worked as Coordinator of Materials Science at Clinical Research Associated (CRA, now as CR Foundation) and Staff Engineer at Fairchild Semiconductor. 

Dr. Cao holds PhD and MS degrees in Materials Science and Engineering from University of Utah and MS and BS degrees in Electronic Engineering from Jilin University of China. 

The notable technologies developed by Dr. Cao include LED dental curing lights, modern diode lasers, 360 degree beam LED lighting sources, LED forensic lights, and medicament delivery strips. Each of these technologies has made significant impact on the industry and is described below. 

Dr. Cao invented LED dental curing light in year 2000 and introduced the first LED curing light to the market in 2001 with a distribution partner.  The key patent is US patent 6,331,111 which teaches fundamental methods to build an LED curing light. There are more than 30 patents issued to Dr. Cao for LED curing light to cover all features of LED curing lights. LED curing light invented by Dr. Cao has been adopted by dentistry and become a standard tool in daily practice. As today, nearly all the LED curing light manufacturers licensed the technology from Dr. Cao. The technology is estimated to save more than $6K each year for each dentist in addition to providing better care for the patients.

Dr. Cao invented 360 degree beam LED light bulbs in 2002 and setup an instrumental structure to build an efficient, 360 degree beam LED bulb to replace traditional incandescent light bulb. Dr. Cao introduced the first 360 degree beam LED to the market in 2006. The key patents are 6,465,961; 6,634,770; and 6,746,885. The structure invented by Dr. Cao is essential to use LEDs to replace traditional incandescent and HID lamps. These teachings are adopted by LED lighting industry worldwide. As known, LED light bulbs will save up to 70% of energy comparing incandescent light source. LED light bulb is a $25 billion industry as today. 

Dr. Cao invented modern diode laser systems in year 2003 with features of cartridge fiber management, disposable tips, touch screen control, wireless footswitch, battery operation, and etc. The first product was introduced to the dental market in 2003 with a distribution partner. The key patents are 7,485,116; 8,337,097; 8,834,457; 8,961,040; 8,967,883.  These technologies enable the wide adoption of diode lasers in medical, dental, and veterinary fields to provide much desired patient/client care and become standards for modern diode laser products. The diode laser applications in dental, medical, and veterinary fields are more than $100 million industry as now and growing from year to year. 

Dr. Cao invented the LED forensic lights in 2004. The key patents are 6,954,270; 7,252,678; and 7,267,457. The technology enables the investigators to collect evidence timely and efficiently. The products have been widely used in policy community and featured in CSI TV shows. The products have helped to solve many cases worldwide. Notable cases are Taiwan President shooting, JonBenet Ramsey, Lacy Peterson, Kobe Brian, O.J Simpson, and etc. The same principal has been used to oral cancer detection in the dentistry.

Dr. Cao and his colleagues invented advanced medicament delivery strip to deliver different medicaments to teeth surface in 2006. The technology features a flexible substrate and gelatin compound to enable patients to do the applications at anytime and anywhere. The technology was first applied to teeth whitening. The strip technology will be used for fluoride treatment, desensitizing, topical anesthetic, periodontal treatment, caries prevention, tooth remineralization, and any possible medicament delivery to oral environment. 

Dr. Cao continues to work in solving critical issues in the dental and medical fields including methods to eliminate first and secondary caries, reversible cement for better bonding and de-bonding of prosthetics including orthodontic brackets, sterile endo process for 100% successful endo, better prosthetic materials for long term clinical success, advanced laser surgical procedures, laser cancer treatment, and etc. with a goal to make practitioners’ daily job Easier, Faster, and Better.

Howard Farran: It is just a huge honor for me today to be podcast interviewing Densen Cao, PhD. This man is amazing. He is the founder and CEO of the Cao group in West Jordan, Utah, and engages in research and development, manufacturing, marketing and sales of products in medical, dental, veterinary, forensic and LED lighting. Since year 2000, Dr. Cao has led the company organically, grown into a global company, and has created many innovative technologies and products engage fields to serve its global customers.

Dr. Cao is the inventor of more than 160 issued and pending patents and published more than 20 technical papers. Dr. Cao came to the United States in 1986 from China to pursue PhD degree at the University of Utah. Before founding the Cao group in the year 2000, Dr. Cao worked as coordinator of material science at Clinical Research Associates, CRA, now CR Foundation, that's Gordon Christensen and Rella Christensen and staff engineer at Fairchild Semiconductor.

Dr. Cao holds PhD and MS Degrees in materials science and engineering from University of Utah and MS and BS Degrees in Electrical Engineering from Jilin University of China. 

The notable technologies by Dr. Cao include LED curing lights, modern diode lasers, 360 degree beam LED lighting sources, LED forensic lights and medicament delivery strips. Each of these technologies has made significant impacts on the industry and is described below.

Dr. Cao invented, he invented, LED dental curing lights in year 2000 and introduced the first LED curing lights to the market in 2001 with a distribution partner. The key patent is US patent 6,331,111, which teaches fundamental methods to build a LED curing light. There are more than 30 patents issued to Dr. Cao for LED curing lights to cover all features of LED curing lights.

LED curing light, invented by Dr. Cao has been adopted by dentistry and becomes a standard tool in daily practice. As today, nearly all the LED curing light manufacturers license the technology from Dr. Cao. The technology is estimated to save more than $6,000 each year for each dentist in addition to providing better care for patients.

Dr. Cao invented 360 degree beam LED light bulbs in 2002 and set up an instrumental structure to build an efficient 360 degree beam LED bulb to replace the traditional incandescent light bulb. Dr. Cao introduced the first 360 degree beam LED to the market in 2006. The key patents are 6,465,961, 6,634,770, and 6,746,885. The structure invented by Dr. Cao is essential to use LED's to replace traditional incandescent and HID lamps.

These teachings are adopted by LED lighting industry worldwide. As known, LED lightbulbs will save up to 70% of energy comparing incandescent light source. LED lightbulb is a $25 billion industry as today.

Dr. Cao also invented modern diode laser systems in year 2003 with features of cartridge fiber management, disposal tips, touchscreen control, wireless foot switch, battery operation, and etc.

The first product was introduced to the dental market in 2003 with a distribution partner. The key patents are 7,485,116, 8,337,097, 8,834,457, 8,961,040, 8,967,883. These technologies enable the wide adoption of diode lasers in medical, dental, and veterinary fields to provide much desired patient clinical care and become standards for modern diode laser products.  The diode laser market applications in dental, medical and veterinary fields are more than $100 million industry as now and growing from year to year. 

Dr. Cao also invented the LED forensic lights in 2004. The key patents are 6,954,270, 7,252,678, and 7,267,457. The technology enables the investigators to collect evidence timely and efficiently. The products have been widely used in policing community and featured in CSI TV shows. The products have helped to solve many cases worldwide. Notably, cases are Taiwan President's shooting, JonBenet Ramsey, Laci Peterson, Kobe Bryant, OJ Simpson, but he did not use this technology to solve my murder, which we won't talk about. 

Densen Cao: Okay.

Howard Farran: The lawyers told me not to say anything.

Densen Cao: Alright.

Howard Farran: The same principle has been used to oral cancer detection in dentistry. Dr. Cao and his colleagues also invented advanced medicament delivery strip, to deliver different medicaments to teeth surface in 2006. The technology features a flexible substrate in gelatin compound to enable patients to do the applications anytime, anywhere.

The technology was first applied to teeth whitening. The strip technology will be used for fluoride treatment, desensitizing, topical anesthesia, periodontal treatment, caries prevention, tooth remineralization and any possible medicament delivery to an oral environment.

Dr. Cao continues to work in solving critical issues in the dental and medical field including methods to eliminate first and secondary caries, reversible cement for better bonding and de-bonding on prosthetics including OrthAlign brackets, sterile endo process for 100% successful endo, better prosthetic materials for long-term clinical success, advanced laser surgical procedures, laser cancer treatment, etc, with a goal to make practitioners lives easier, faster, and better.

My God, Gordon Christensen told me you were the man behind the scenes that has done so much for dentistry. It's incredible.

Densen Cao: Thank you.

Howard Farran: It's so hard to get a patent, and you have so many. What are you excited and passionate about today in dentistry? What are you working on now?

Densen Cao: A few topic is critical to dentistry, definitely, dental caries and part of your talk reveal quite a bit already, how we can arrest caries and it is a tough challenge, to the entire dentistry. So that's one thing we're working on.

Another one we're really wild about [inaudible 00:06:46] proof, endo process so every dentist can do endo. Third one is, you talk about it, you want every dentist can do orthodontics and we're working on a technology we can really have all the GP's can do orthodontic comfortably and basically we talk about it as a reversible cement so you can bonding, de-bonding the orthodontic bracket on command. So, those are the few things we're working on right now.

Howard Farran: Your website is Caogroup. Cao is spelled C-A-O, group so What would all the dentists listening to you today find if they went to your website

Densen Cao: Right now with our product in North America exclusively distributed by [inaudible 00:07:45] and few products on our website right now definitely the lasers and curing lights and also our whitening strip. That's the main product and we also have a topical varnish for the anesthetic applications and we also have a hemostat agent and all other products, so.

Howard Farran: So, lets start with LED light bulbs. Tell us your journal on LED. How did you go from being born 1000 miles north of Beijing, end up in Salt Lake City, and invent the fundamental technology of the LED curing light and what percent of the curing lights that the 2 million dentists around the world use today are using your technology that you invented and patented?

Densen Cao: Let me answer your first question first. I was born in China and as a first batch of college students and after cultural revolutions 1978 ...

Howard Farran: What year were you born? You were born in '62?

Densen Cao: '62. Same as you.

Howard Farran: Same as me, we're both 55, you just look 10 years younger than me. You must have had ...

Densen Cao: Oh no, I think you look much younger.

Howard Farran: You must have had a much easier life than me. When was Mao's revolution?

Densen Cao: Mao's revolution about 1966 and so cultural revolution from 1966-1977 there's all the colleges were stopped, so no college student during that time period. So China start the first college entry exam starting 1977. I was lucky enough, I got into college in 1978, so, the year after.

Howard Farran: So, how old were you then? So, '62 to ... So you were 16 years old.

Densen Cao: 16. Yeah, I was the youngest student in my class.

Howard Farran: Nice. Nice.

Densen Cao: So, my college, I study, they call it optoelectronics at that time, and basically is electronic that deal with product that emitting lights. Right now you can call LED or lasers. The reason I invented LED happen always in my career and I came to University of Utah to pursue my PhD program, actually in LED's and my mentor, his name was Jerry Stringfellow, and he is the one that create the fundamental technologies so can make LED to be a mass production. That's why the LED have the low cost as today. Definitely he deserve a Nobel Prize, I think, one day he may get it.

So that's why I'm in the LED and laser field and I'm able to bridge the gap between LED and the medical dental field. So as today, all the LED light in the dentistry, they all use my technology. In the US, nearly all the manufacturers, probably I don't know what curing light you use, Howard, in your practice, or whatever the purpose it would be I believe they all licensed my technology and to use that technology for their products.

Howard Farran: So, what was everyone using before the LED?

Densen Cao: Before the LED is a Halogen. The brand name is [inaudible 00:12:00] so they used the Halogen light bulb and the Halogen have a lot of issues, definitely number one is the heat. They have a lot of heat. Number two is they are a large size, the size is pretty large, like a pistol gun. And the third one is really the lifetime. You know, the dentist has to change the Halogen light bulb probably every six month or so. Right now the LED, I think almost every single manufacturer can warranty the LED light at least for two years or longer.

Howard Farran: We're both 55, I'll be 55 next month, August 29. When I got out of school 30 years ago, the main filling was an amalgam. It was half mercury, half silver, zinc, copper and tin. The reason it worked so well was because when it set up it actually slightly expanded and then corroded and oxidized and it sealed out all those microorganisms, fungi and viruses that we can't see with our eye, and now because of the tooth-colored, cosmetic revolution they all went to tooth-covered and when you cure these composites with your LED light, they slightly shrink, leaving a gap, which makes them very ... Bugs, microorganisms get underneath it and they don't last as long. A lot of people think the metal mercury fillings lasted about 38 years and these tooth-colored, pretty fillings last six and a half years. How do you think that problem will be solved in the future? Do you think that you will ever shine an LED on a composite and it won't shrink? Or maybe even slightly expand?

Densen Cao: I think you have to look at this as two issues. One is really the curing property of the material and itself. Another one is the material properties. Number one, we need a curing technology so you have at least a shrinkage in both bonding side and also on the material side. Another one truly resolve this issue is, Howard, probably you already cited amalgam history and story, we need a white color amalgam.

Howard Farran: Yes. A white metal. Is there a white metal? Are you working on a white metal?

Densen Cao: It is not a white metal. It's a white material that would have the same property as amalgam. That's what you need.

Howard Farran: And when you a white material that has the same property of amalgam, do you mean expands upon setting? Is that the main property you're looking at? Or are you looking at the strength of the metal?

Densen Cao: No, actually, you look at it slightly setting wise but the most critical is you have to have a long-term, permanent bacterial inhibitant agent inside. That's what amalgam is about. Amalgam expands a little bit but amalgam leak like other material. The interface between amalgam and tooth also leaks too. It's a matter of the bacteria cannot exist or grow in that interface. That's why made an amalgam is good for the long term. That's why you don't have less secondary caries with amalgam material.

Howard Farran: So what do you think the main bacterial inhibitant is to a silver filling, I mean, it's half mercury, you never find mercury in a multi-vitamin. The other half of the mercury is silver, we use silver diamine fluoride in pediatric decay, tin, we use stannous fluoride in mouthwashes in the hygiene department. Silver, zinc, copper, tin, what do you think is the main bacterial inhibitance to bacteria microorganisms in an amalgam?

Densen Cao: Amalgam definitely it's the silver. That's the element stop the bacterial growth.

Howard Farran: Is silver ...

Densen Cao: Yeah, the silver is the one. That's why a lot of people use silver diamine as today for quite a few treatment the key is, nobody like the color. I think that's also, you know, amalgam ...

Howard Farran: Which I think is crazy because like right now I've been talking to you for ten minutes and I still haven't seen one of your molars. I get it if it's a girl, I get it if it's your front ten teeth upper and lower but molars? Are you out of your mind? When's the last time you've seen a man's molar.

Densen Cao: Not very often, that's for sure and particular, depending on from person to person and to me an amalgam is not a bad material but, you know, there are politics in there, as you know, the toxicity issues and already been banned in Europe now being used. So, i think the best way to look at it is how we can really make a material and it be a long-term bacterial inhibitant. That's going to be the key.

Howard Farran: So, are you working on that material now?

Densen Cao: Yeah, we are working on a lot of material and we did [inaudible 00:17:58] study at the University of Washington and we can see clearly after at least one year, there is no bacteria regrowth with that material. While continue working with [inaudible 00:18:19] and other people and we wanted ... There is more testing on there and if this material is very feasible, like I said, it's a [inaudible 00:18:28] and then we could have one material or compound or composite or cement, whatever that would be long term bacterial inhibitant. That's very, very important.

Howard Farran: I remember talking to the president of Ivoclar, a very amazing dental company and he said if he had two dreams, two wishes, he said it would be a composite that had a bacterial inhibiting effect and the other would be a reversible cement with cementing crowns on implants or teeth, it would be so nice if you could do something, warm it up, zap it with a laser, something, to take the crown back off and check how it's going underneath there. How close are we, do you think, to a reversible cement where we can take the crown off the implant or the natural tooth and see what's going on underneath and clean it up?

Densen Cao: I think probably maximum two years I think maybe less than that.

Howard Farran: Wow. Two years? That's like tomorrow!

Densen Cao: Yeah, less than two years for sure. We already finished all the lab study already. So, we already have the product, is matter, you know, we need to do more validation so we can put it on the market.

The first application will be for the bonding, de-bonding orthodontic bracket on [inaudible 00:20:02]. 

Howard Farran: And what will de-bond it? Will it be heat? Will it be a laser?

Densen Cao: It will be a laser. 

Howard Farran: And that has always been your passion, right? Laser, light amplification, stimulation, emission of radiation.

Densen Cao: Yeah, and also the material too.

Howard Farran: So, your love for lasers, and you've done so much, what percent of the diode lasers in dentistry around the world use your technology?

Densen Cao: I don't have the exact numbers but I relatively know, estimated how many units in the market based on the shipment we have, from our side and consider other people. I think closely it would be around 40 or 50 thousand units.

Howard Farran: You started out, you cut your teeth, on LED curing lights and then you moved into diode laser systems. Are LED curing light technology and diode laser systems, is that kind of a similar technology?

Densen Cao: It's the same principle, but it's different devices. They all come from a semiconductor material emitting a light. And when you emit the light in a mono wavelength, that's called a laser. When you emit a light in a broader wavelength, that's called an LED, light-emitting diode.

Howard Farran: What's more cold and freezing, where you were born in Northern China or Salt Lake City?

Densen Cao: Definitely my hometown in China.

Howard Farran: Is it?

Densen Cao: The coldest day is 40 below zero Celsius.

Howard Farran: So you were up near Mongolia then?

Densen Cao: Yeah, near Mongolia, actually on the East side of Mongolia and also very close Russia. My hometown is about 300 mile from Russia.

Howard Farran: And how often do you go back?

Densen Cao: I go back to China pretty often because I have a factory in there, so, probably every two or three months.

Howard Farran: Can I tell you the funniest Chinese story of my life?

Densen Cao: Sure.

Howard Farran: I was lecturing in Hong Kong and Shenzhen. And then we were driving, maybe two hours into China, away from Hong Kong, so maybe two hours away from Hong Kong in a car, and we went and we saw a school and all these little kids and they couldn't have been five. And I sat down on the floor with them and the biggest five year old, starts slowly approaching me, he was trying to read me, like what I was going to do. And he finally reached out and touched my bald head and he goes, "ooooooh!" And as soon as it was safe and I smiled, all the kids leaped forward and they were all touching ...

Densen Cao: They all touch you.

Howard Farran: My head, going, "ooooooh." It was so adorable.

Densen Cao: Alright. You are a lucky man!

Howard Farran: I don't think there's a lot of male pattern baldness where I was at. Is baldness rare around Shenzhen?

Densen Cao: No, I think, not rare, probably just not bald people shaving the head like you did.

Howard Farran: So that's what it was?

Densen Cao: Yeah.

Howard Farran: It's because I was bald and shaving it? But oh my God those kids were adorable.

So, you did the LED's, and then you did diodes, and now you think the reversible cement, that we're within two years away from cementing a crown, zapping it with a laser and being able to take the crown off and check it?

Densen Cao: Exactly. I think right now our technology pretty for sure we can do the orthodontic cement can also do the material like e.max. We still working on the material like zirconia, others, because they have different translucencies and, so, I think certain materials will be in the near future for sure.

Howard Farran: So, what's got you passionate right now?

Densen Cao: Right now, I think we're working on, we call it Star Trek Project. Number one, definitely, we know some of the goals, we know we can reach them. Some of the goals we know we have to explore them. Number one, for us, is [inaudible 00:24:45] in the caries. Definitely that's my biggest passion at the moment. Different method, different approach, see is it possible. Number two is, I want to use a laser to treat cancers. It definitely is a long-term project but we already test and validate on the mice so laser is very, very possible to treat the cancers.

Howard Farran: So you're basically an engineer. And I've always thought, whenever you're sitting at a table with a bunch of dentists, they talk like engineers. They talk about wear rates of fillings, they talk about bonding, they talk about bridges. But I always thought that we build like an engineer, like we build a barn, but at the end of the day we lose the barn because of termite's biology. And they're always talking about wear rates of fillings. I don't have a problem with my fillings wearing down. They talk about bonding strengths of fillings. I don't have a problem with my fillings falling out. 

What I have a problem with, is that usually six and a half years after you put in that tooth colored filling, there's a biofilm of microorganisms, bacteria, viruses and fungi that completely destroys and eats the tooth structure. You've been working with medicaments on strips. We have the same problem with implants. Now that we've placed millions of implants over a decade ago the literature's pretty clear that about 20% of them have peri implantitis around them. Again, I think dentists need to become more biologists and less engineers. We build these great structures, but they fail from biofilm, microorganisms, fungus, viruses. What are you doing with the medicament strips? How do you think these medicaments will reduce decay or peri implantitis, things like that?

Densen Cao: You know, the challenge, Howard, for the oral environment is how you can consistently deliver a medicament onto the surface or in the socket. I think this is the number one challenge. We do have good drugs, like chlorhexidine or others can kill or prevent bacteria. It's a matter of how you can have those drug can be consistently delivered to the treatment surface. Right now, you look at it and you can use a tray, you know, put a gel, everything in there, it delivers medicament or you can use a tablet into your blood system, circling through your blood and getting into the treatment area and then brush and rinse, have a very short period of time the medicament can stay on the surface so the key is how you can make a device, people can put it on and not being annoyed can use it on a regular basis and put all the necessary medicament[inaudible 00:28:27] and the [inaudible 00:28:28] can deliver the medicament.

Howard Farran: So were you behind the bleaching materials on the strips?

Densen Cao: Yes. Actually I'm wearing my strip right now.

Howard Farran: From Crest Strips?

Densen Cao: No, it's ours.

Howard Farran: But were you behind the technology of the Crest Strip?

Densen Cao: No, we are not behind Crest Whitestrip but we are the only one overcome whitestrips patent and made a huge improvement on top of that. Right now I'm wearing my strip since I talking with you so you see you cannot see the difference. That's the future of technology.

Howard Farran: Who is distributing your improvement upon the Crest Whitestrip?

Densen Cao: Henry Schein.

Howard Farran: Henry Schein. And what is it called?

Densen Cao: Called Sure White.

Howard Farran: Sure White. S-U-R-E?

Densen Cao: No, S-H-E-E-R, Sheer. Sheer White.

Howard Farran: Spell it again? S-U-R ...

Densen Cao: No, S-H-E-E-R. Sheer. Sheer White.

Howard Farran: Oh, S-H-E-E-R? Or E-A-R?

Densen Cao: E-E-R.

Howard Farran: E-E-R. Sheer Strip?

Densen Cao: White. 

Howard Farran: Sheer White.

Densen Cao: Sheer White.

Howard Farran: Can you text me that, Ryan? It's called Sheer White Strips by Henry Schein?

Densen Cao: Yeah. [inaudible 00:29:51] by Henry Schein. Yeah. 

Howard Farran: And is that sold to the dentists or directly to the consumer?

Densen Cao: To the dentists. To the dentists only.

Howard Farran: To the dentists only. And what's the price of Sheer White Dental Strips versus Crest Whitestrips?

Densen Cao: To the dentist, the price are around $20 per treatment and one treatment is five days. Our five-day treatment can be as effective as 14-day treatment of Crest. 

Howard Farran: Nice. I just pulled that up. Okay, Ryan, so you sent me his ... Is Sheer White Dental Strips, do they have their own website? Or are they on Twitter? Or is that a ...

Densen Cao: No, it's just on the website.

Howard Farran: The Cao ... Okay, ask your Henry Schein representative to order what you need today, call 1-800-372-4346 or purchase online at Henry Schein. And how much do you think the Crest Whitestrips are? You think yours is ...

Densen Cao: A Crest Whitestrips to a dentist probably, I don't now a price but on the retail side, Crest Whitestrip ranged from $25 up to $60 depending on different packaging or technology they used.

Howard Farran: Should we add this YouTube video you have at the end of our PodCast?

Densen Cao: That would be great.

Howard Farran: Yeah, so, Ryan, why don't you email that YouTube video to me and Ryan, does he need to send it to you, Ryan, or do you have it? Okay, I'll email it to you, Ryan.

Was that your first medicated strip? This Sheer Whitestrip? Was that your first medicament on a strip?

Densen Cao: Yeah. Right now we have, you know, desensitizing, we're working on fluoride and imperial and topical anesthetic and also remineralization of a tooth's surface. And we're working on all-around, for the treatment, so, people can use it as a part of a layered, daily oral care activities.

Howard Farran: You said something very interesting, it just rolled off your tongue, but, when dentists do root canals, the number one cause of a failed root canal is we miss an entire canal.

Densen Cao: Right. 

Howard Farran: But even if we find all the canals and we get to the bottom and we clean and shape and file them all out, we're actually only removing about 60% of all the pulp and debris and microorganisms and virus and fungi. There's another 40% in periphery canals, fins, I mean, there's no such thing as a canal that's perfectly round to fit your file. 

Densen Cao: Sure. 

Howard Farran: Are you working on a way to clean that additional 40% that you could never file out or you would have to destroy the whole tooth to get to it all if you're going to mechanically remove it?

Densen Cao: Yes. That's why we are working on such a technology, you know, Gordon Christensen tell me right now endo is witchcraft. You just, a lot of inconsistency depending on who doing it. Or what technology you use. Most important part is the residual bacteria or residual tissues, you know, residual contaminations after you file them. Even there are a lot of technology claim you can clean them, like you said, Howard, but none of them can really have them cleaned.

So we're working on a process which we try to be a dummy proof process. You can simple and easy clean the canals and same time after that, back to the original amalgam conversation is, if you can fill it up with a material containing an agent can permanently, permanently, have the bacteria inhibitant property. So you [inaudible 00:34:16] you will have a complete, 100% success endo process.

Howard Farran: Well, you know, that was the original theory of an Italian dentist named Dr. Angelo Sargenti, who said that you shouldn't be filling these canals with an inert cement like Grossman's cement and he recommended a paste with paraformaldehyde. There's all kinds of versions of it, some had lead in it, some had arsenic in it. But the endodontists did not like this at all, the lawyers did not like this at all because when paraformaldehyde, lead and arsenic went out the end of the tooth, it was a disaster. So, you're looking for and agent, a bacterial inhibitant in the paste that's not toxi to the whole body if it went out the apex?

Densen Cao: Exactly.

Howard Farran: Do you already got ideas on that? Or can you not talk because you're ...

Densen Cao: Yeah, we're working on that and we not only have the idea, we are in the middle of the process and we just definitely need further validation just make sure in apex area and then it will be safe through the nerve and other than that, we do have a material that works. We have a cement like you talk about, it's going to expand a little bit after being cured and can seal the canal, same times and also containing an agent like the long-term bacterial inhibitant.

Howard Farran: Well, if you need any research, if you can't afford primates and monkeys and apes and all that stuff, I will donate my five sisters and my four sons for this research. Ryan would you mind being the first Guinea pig? He can't afford a Rhesus monkey so I'll send Ryan.

Densen Cao: Alright. Yeah. 

Howard Farran: You know, you have an extensive background in lasers and there are some endodontists around the world trying to clean canal systems with lasers. What are your thoughts of that?

Densen Cao: Laser alone, that will not work, just because you need quite a bit of energy to carbonize the tissues or clean the surface of the dentin. That energy would cause big thermal issues for the tooth. Just be better kill the tooth even just use the laser alone. So, laser alone I think is quite a bit unproven at this moment until other new wavelengths been identified. Current lasers on the market doesn't matter is a diode or a solid laser or CO2 laser itself cannot do the endo process. People talk about [inaudible 00:37:23] all the things they can do parts of endo process but they cannot do a complete endo process. It has to be a laser plus other chemicals so you can use a low energy of a laser with a local [inaudible 00:37:39] effect without increasing temperatures on the apex area or the entire tooth structure.

Howard Farran: So, when you look at dentistry, half the world is afraid of a dentist. The other half are afraid of the cost of a dentist. It seems like the two major fears are, "are you going to hurt me" and "how much is this going to cost". Regarding, "are you going to hurt me", what do you think of the lasers, you've done extensive diode lasers, what do you think of the hard tissue lasers and do you think that will ever be mainstream to remove tooth structure?

Densen Cao: I think right now hard tissue laser [inaudible 00:38:34] CO2, they can definitely remove tooth structure but the cost definitely is a prohibit feature at this moment. Compared to our lasers around the $5000, in that price range, but most hard-tissue lasers still range around $30,000. Plus they're kind of slow compared to a high speed hand piece. I think that's another drawback for hard-tissue laser but if the price is lower enough for hard-tissue lasers and then dentists learning how to master to use the laser to cut tissue, it can be a mainstream and definitely going to be a lot of drive to lower the price and also increasing the cutting speed. Dentistry, Howard, you know you have been in dentistry how many years?

Howard Farran: 30 years.

Densen Cao: It's a slow industry, right? You look at laser has been in dentistry almost more than 20 or 30 years and still not a mainstream. You look at a CAD/CAM, also I first remember look at a first CAD/CAM from Cerec when I was in the CRA [inaudible 00:39:53] almost 25 years ago. You look at it today, still not mainstream. So, I guess laser had to wait until the technology really mature, but, need another [inaudible 00:40:06] innovation from time to time. Get the technology into the mainstream.

Howard Farran: When dental X-Rays came out, and when the high-speed handpiece came out, pretty much all the dentists adopted it within a year or two. But when the CAD/CAM came out, and when the lasers came out, 25 years later they don't even 10% of the dentist. Right?

Densen Cao: That's correct. I think laser is a matter can those technologies resolved immediate issues, right? The X-Ray definitely is a necessary tool and same thing for the high-speed handpiece. You look at a CAD/CAM and also laser-wise is an accessory at this moment. It will help, but it's not saying, "hey, I must have it."

Howard Farran: Do you think, as far as the implants go, we've heard that an implant company ... You know, when you place a hip implant, if it gets a staph infection, it's a nightmare. And there's word out that Zimmer is coming out with a surface on their titanium that will be more resistant to a staph infection on the surface of its implant. When you look at filling material, you say the filling materials should have the composite, the tooth colored white material should be bacterial inhibitant. Do you think it will be that and medicaments on strips or floss, do you think the next generation of titanium dental implants will have some type of bacterial inhibitant on their surface or do you think that will also be something applied with floss and strips? I'm still always surprised that your standard floss that people use around the world doesn't have a medicament on it.

Densen Cao: Yeah, I think you are absolutely right, Howard, that definitely next generation implant material definitely [inaudible 00:42:18] few things you know already. Bacterial growth, infection same time [inaudible 00:42:27] periodontal disease, all the things, I think, should be incorporated in next generation implant and I think probably not only us, will be many companies working in this directions.

Howard Farran: Yeah. What's next for you? I've been asking you a lot of questions but I feel like I'm not smart enough to be asking you the questions. I feel like I'm not smart enough to even know where your mind is. What's next around the corner for you?

Densen Cao: I don't know, definitely my passion is develop new technologies and I don't settle myself in a box. If one day I wake up and I have an idea, my colleague have the idea, one thing I know next, let's try it and see if it works, right? And throw many thing to the wall, hope one thing will stay. Internally we have like 20-30 projects going parallel, we don't know which one will work as well until we got the scientific evidence [inaudible 00:43:36] engineer about it. We rely on everything on science, it's not for instinct. 

Next thing, big thing I think if we could, working on eliminating caries, that would be the big one. How we can come out [inaudible 00:43:53] and why you go to the dental office and they'll tell you, "hey Howard, you have a high risk for caries" because a lot of people misunderstood caries quite a bit, through our research is a lot of thing is relate to the genetic. How much calcium can be released from your gland, that's one of the major factors for caries and at the same time people always thinking, oh if you have a low PH level you will have caries, but the caries are really determined by two major factors. One is the PH level and another one is buffer capacity in your mouth. The buffer capacity determined is really by how much calcium you will release to the saliva, through your gland. It's a genetic. So, how we can tell the dentist to help patients say, hey, you're going to be high risk, you need to do more for your oral hygiene, flossing at the right time, brushing ... Everybody know we brush teeth at the wrong time every day. The morning and the evening, it's all the wrong time that you do. The best time to brush your teeth is within 15 minutes after you're eating any food. 

My next thing definitely try to find a way, if we can, really, conquer, arrest caries. That will be my big goal, but I don't know if I can accomplish on that but definitely I'll give it a try.

Another one we did a good testing already and got initial results, hopefully we can use lasers and one day we can cure cancers.

Howard Farran: Before you get into oral cancer, let's go back to ... You say we brush our ... Caries has more to do with the PH level and the buffering capacity of the saliva, how much calcium your body could emit and that would be genetic. You say we brush at the wrong times, first thing when we wake up and before we go to bed and the best time to brush within 15 minutes. A lot of people wonder about toothpaste, that they're too abrasive. When you look at the abrasivity chart, it looks like what our grandpa was using 100 years ago, which is just straight out Arm & Hammer baking soda, seems to be the least abrasive and the best at buffering. What is your favorite toothpaste?  And then there's some people, like Trisha O'Hehir, a very famous hygienist, she says she doesn't even believe in toothpaste. She just thinks dry-brushing is actually effective and all the toothpaste and surfactants and all that stuff, she doesn't even care about any of that. She prefers dry brushing. So where do you weigh in on all that?

Densen Cao: Definitely I don't have my favorite toothpaste, I just pick out whatever is available. I think that all the toothpaste ... I would agree with the hygienist, yes, toothpaste is just a medium making tooth brushing comfortable or pleasure, all those things. Definitely there are a lot of medicament in toothpaste that help you for the biofilms, for the bacteria, whitening, imperial, desensitizing, all other things but none of them really working factor efficiently. So it's all about popular education. I truly don't know why human, you know, you and I have to have the habit, go brush the teeth before go to bed, maybe just wonder if your partner feel good about it or you brush in the morning and you want fresh breath. So all those things work but do less work for your oral health. Based on the data that we collected, we know your high risk time in your oral environment is within 15 or 30 minutes after you're eating food, particularly you're eating sugar or whatever. Most bacterias will grab any sugars in your mouth and discharge acid immediately. That's about how we get caries. People can either rinse or brush or flossing after you're eating and we would have less caries for sure.

Howard Farran: I think it was amazing when Rella Christensen was telling me, if you ask a dentist, "what causes a cavity?" they'll just say streptococcus mutans. And Rella was saying that by the time you get 4 millimeters deep into a cavity, that there's not even streptococcus mutans and that 4 millimeters down into a cavity every three months, they're discovering a complete new species of bacteria. And then there was another paper I read this year that they were very amazed at how much fungi work together with other bacterias, so fungi and bacteria are working together in the cavity.

Densen Cao: Yeah, definitely, I just talked to Rella 3-4 weeks ago and she found a lot of new bacteria. I said she should be nominated for a Nobel Prize too because she's doing a lot of work that a lot of people don't want to pioneer or explore and you have to definitely invest time and money into it. Everyone know that we have more ... hundreds bacteria in our oral environment [inaudible 00:50:13] with us every day. If you're talking bacteria, you're talking dirtiest place in the human body is your mouth because you have more bacteria in that place than any part of your body.

Howard Farran: So, who are you doing you're endodontic research with?

Densen Cao: Right now, we're doing internally right now, we may have a team up with other schools doing it. So ...

Howard Farran: Hey, Ryan. Brad, will you bring your endo book and come over here. This is probably one of the smartest people in the world. He's got a PhD and he's working on an endo ... Ryan can take we take this off to where.

Ryan: Just set it down.

Howard Farran: Just set it down. This is Brad Gettleman. This is the man who has ... yeah. [inaudible 00:51:09]. Well, here. You put it on. 

Brad Gettleman: I can talk to him.

Howard Farran: This is Brad Gettleman. He wrote a chapter in the ... chapter 8 in the most read endodontic book. This is the man. He has a PhD. He's from China. He's up in Salt Lake City. But he's the one who has all the patents on LED curing lights, the modern diode lasers. So when you're using an LED curing light or you see a diode laser in dentistry they're using ... he's got like 20 patents ... but he's working on an endodontic cleaning system. 

Tell Dr. Gettleman ...

Brad Gettleman: What's your cleaning system?

Howard Farran: Well, what is your cleaning system?

Densen Cao: Our cleaning system is a use of laser and a solution. And this solution have a 100% absorption of the laser energy. 

Brad Gettleman: The solution [crosstalk 00:52:05] absorbs the laser energy.

Densen Cao: Right. And the solution itself gonna explode in a microlabel to ablate all the residual tissues or bacteria or whatever inside the canal.

Brad Gettleman: Okay. It kills bacteria. It dissolves tissue as well?

Densen Cao: Yes.

Brad Gettleman: Vital?

Densen Cao: Yeah. I mean anything inside is canal carbonized it. 

Brad Gettleman: Okay? What does it do to dentyne?

Densen Cao: It's going to carbonize a thin layer of dentyne.

Brad Gettleman: Okay. [crosstalk 00:52:42] fixes for canals?

Densen Cao: Well, can have the other tubules exposed. 

Brad Gettleman: Go ahead say that again. I'm sorry.

Densen Cao: After carbonization and all the tubules can be cleanly exposed.

Brad Gettleman: Okay, including accessory canals, then, I assume.

Densen Cao: Yes.

Brad Gettleman: What depth? Any idea what depth?

Densen Cao: We can use a fiber tip. Oh you mean the depth. Depth is right now we measured them at about a few hundred microns. 

Brad Gettleman: Okay. And so it's a solution as opposed to all the other lasers, you have to have straight line control and access. This is a solution that gets activated.

Densen Cao: Yeah.

Brad Gettleman: And dissolves the tissue, kills the bacteria. Interesting. Interesting. The new hot thing right now ... not the new, but the thing that's been hottest lately is the sonendo [crosstalk 00:53:34]

Densen Cao: Yeah. Sonendo is a cycling the chemical agent.

Brad Gettleman: Exactly. 

Howard Farran: What is soloendo?

Brad Gettleman: Sonendo. 

Howard Farran: Sonendo.

Brad Gettleman: Yes.

Densen Cao: Sonendo.

Brad Gettleman: S-O-N-E Endo. Sonendo. 

Howard Farran: And who makes that?

Brad Gettleman: That's the company ...

Howard Farran: Where are they at?

Brad Gettleman: I believe so.

Densen Cao: They're in Boston, I believe. Yeah.

Brad Gettleman: Boston?

Densen Cao: Yeah. Boston or San Francisco, either way. 

[crosstalk 00:54:01]

Brad Gettleman: Yeah, just endo.

Densen Cao: Just for endo. 

Brad Gettleman: How long has it been on the market? A good couple years, like I said it's the new-

Densen Cao: It's been there about a year or so.

Brad Gettleman: Yeah, they've been-

[crosstalk 00:54:18].

I know a little bit about. I've not used one. I can talk to you about it and we can look it up and you can get a rep to come talk to you. It's interesting stuff, but it's getting into the real conservative end of Endo, which is where he's going with this is more conservative preparations just because ... The bottom line-

Densen Cao: Our technology-

Brad Gettleman: Like we talked about yesterday, the reason we shape is just [crosstalk 00:54:41], a situation, a system we can fill. If we just clean the canals, the shape is just [inaudible 00:54:47].

Densen Cao: Exactly.

Brad Gettleman: The cleaning is the key thing and we've never been able to sterilize a canal system. If he's saying 100%, he's talking sterilization. He's not talking 95% disinfection. There's a big difference there.

Densen Cao: Exactly.

Brad Gettleman: If you can create sterilization, it's big difference ... Look I look like a sportscaster with my Titleist hat on. So Bubba Watson had a nice drive on the third hole. 

There's a big difference. I can talk to you about all the stuff if you want to and this misinterpretation, misunderstanding that ... You ought to go up to Utah and talk with him about this. I'll go up there with you.

Densen Cao: Yeah I mean, he's a-

Brad Gettleman: If you want to ... I'd like to-

Densen Cao: I'm sorry, name Brad right?

Brad Gettleman: Yes. Brad to you, Howard has to call me Dr. Gettleman. You can call me Brad though.

Howard Farran: No, I call him Brad Gettleman. Middle name is Howard.

[crosstalk 00:55:47]

Densen Cao: You made the key point that even if I'm not a dentist but you made a key point. Right now, doesn't matter what technology on the market, there's not a technology that can claim sterilization. 

Brad Gettleman: No, you cannot. There's a lot of companies that falsely claim that, but they're full of bologna.

Densen Cao: Exactly. 

Howard Farran: Dr. Densen Cao, this is the number one endo book in the world and there's Brad. The reason I am so mad at Brad is he abbreviated the H. Howard. It's Bradley Howard Gettleman. It should have just gone B. Howard-

Brad Gettleman: No, but more importantly than that, I have a lot better-

Densen Cao: Alright. 

Brad Gettleman: I have much better hair than Howard.

Densen Cao: So you don't have to shave?

Brad Gettleman: I mean let's get down to the brass tax of what's important here. I'd like to to you about it and I'll fly up there for just two hours and look at this with him if you want to Howard. 

Densen Cao: With all this idea, we talk to Dr. Cohen 3 or 4 years ago-

Brad Gettleman: Steve? Steve Cohen?

Densen Cao: Yeah, he said go for it. If we can do that, it lasts 4 or 5 years doing different testing everything all together. I think we're getting very close. I think the process I told Howard is I don't think I tell Howard, but I can just describe to you since you're both on the big book on endodontists, not trying to educate you any just want to get your input.

Our process is like this, you open up the canal, you use one file, what number would it be, remove the bulk tissue in the canal, then you irrigate our solutions and then you have to dry the canal with a paper point. After that, you put our specialized fiber tip into the apex area just slowly moving up. This fiber has the special property, a very large wide angle beam.

Brad Gettleman: What angle beam? A what angle beam dye?

Densen Cao: It is about a 65. It'll cover all the canals, but the bigger challenge is the heat. Managing the heat for the right concentration of dye and the right power sighting of the key. Then after that, we can carbonize everything inside the canal. 

Brad Gettleman: Okay, you're right along what's hot in Endo right now, which is conservative preparations, let's not induce fracture. That's the whole Sonendo deal, and what everyone is going to more and more conservative preparations. The problem that we've had with our irrigating solutions and something you'll have to address is when you're putting the solution down the canal, we're falsely impressed with ourselves, our ability to get the hypochlorite down the apical. We don't, we get a vaporlock. We have the endovac, which is really nice, does a good job. Are you familiar with endovac, how it brings the solution down and sucks it back up?

Densen Cao: Yup.

Brad Gettleman: It's a great idea if it gets clogged up. The idea is nice, it actually carries that solution down the apical region, which has been something that ... We don't really get that as much as we think we do. 

I'd like to go over all of this with you. I'm sure you've addressed this stuff, but these are issues you have to prove you can avoid-

Densen Cao: Definitely. 

Brad Gettleman: They're big issues. Go ahead, just things come to mind.

Densen Cao: Yeah I think, the two issues Brad, you and Howard know already, that's how we target endo. Number one, make sure you clean them well. Number two, you can seal them well, so you don't have any leakage. Sometimes-

Brad Gettleman: Both coronally apically, as well as coronally?

Densen Cao: Yeah, after that then you must have a property, long term bacterial inhibitant.

Brad Gettleman: Which zinc oxide does for a few days-

Densen Cao: No, zinc oxide-

[crosstalk 01:00:26]

We test the zinc oxide, it's doing nothing. 

Brad Gettleman: Yeah it doesn't do what we've been told. So you have a observation material that's antibacterial?

Densen Cao: Yes. 

[crosstalk 01:00:39].

Brad Gettleman: It's the formula. The formaldehyde ...

[crosstalk 01:00:46].

Densen Cao: No it's something brand new, never used in dentistry before. That's number one. Number two-

Brad Gettleman: And it's antibacterial?

Densen Cao: Yes, long term.

Brad Gettleman: Wow. That's pretty cool.

Howard Farran: Can you tell us what it is or is that a secret?

Densen Cao: Still confidential at this moment.

Howard Farran: I want you to tell us-

Brad Gettleman: But it is antibacterial long term? When you say long term, what is that? Is that forever?

Densen Cao: Nearly forever. 

Brad Gettleman: That's pretty cool. An antibacterial observation material would be really nice. 

Densen Cao: Yes. So even dentists don't clean them well. Even you see how some bacteria lasts inside the canal-

Brad Gettleman: Again, we've got sterilization-

Densen Cao: You still have the infection. 

Brad Gettleman: This guy's on the right path, Howard. 

Howard Farran: On the right path?

Brad Gettleman: This is good. This could potentially, this could be a big deal. 

Howard Farran: I mean look at this track record. He's already batting a million. 

Brad Gettleman: This is impressive stuff. I mean without knowing the name and seeing the literature. You're doing the research right now?

Densen Cao: Yes, we are doing in house and usually we don't research ... You know outsource everything other than at the writing stage I talk to Gordon and the writers. 

Brad Gettleman: So when can we come up and talk to you and take a look and see?

Densen Cao: Anytime. You and Howard are welcome here anytime. We're in Salt Lake City and-

Brad Gettleman: It's an hour and 20 minute flight from here. 

Densen Cao: 20 minute flight, you let me know. Of course, we'll coordinate a time based on your travel schedule, my travel schedule, but you're welcome to come any given time. 

Howard Farran: So Silicon Valley is high tech, now they're calling it in Utah, what do they call it? Silicon Slopes?

Densen Cao: Yes it's called Silicon Slope.

Howard Farran: If you look at the ... If you said okay Silicon Valley is the hottest tech bed, where would be next? It's actually northern Utah. It's actually-

Densen Cao: Yeah Utah has a lot of startup companies, particular in the software and other medical field-

Howard Farran: There's a lot of dental companies.

Densen Cao: Yeah, a lot. Of course Utah you autodent, you know Dr. Fisher of course. You have dentists, that's the [inaudible 01:03:02]-

Howard Farran: Dental intelligence-

Densen Cao: Yeah there are many dental companies in Utah. 

Howard Farran: Yeah.

Brad Gettleman: This could be big. 

Howard Farran: Yeah-

Brad Gettleman: Nice meeting you, we'll see you in a few months.

Densen Cao: Yeah, excited Brad you and Howard can come here [crosstalk 01:03:19] let me know. I'll be happy to demonstrate the technology to you.

Brad Gettleman: Yeah I'd like to see it.

Howard Farran: I'd like to say if you need any research companies, I'll donate my 5 sisters and all 4 of my kids-

Densen Cao: Alright.

[crosstalk 01:03:33]

Howard, I want to give you a thumbs up.

Brad Gettleman: Here's what I'll do, I'll access a molar on Howard and we'll go ahead an operate it when we're up there. I'll access it, we'll leave it open, the oral cavity, we'll get it filled all kinds of bacteria and crap for about two weeks, then we'll go up there and see how antibacterial your observation material is. If he lives through we may have something.

Densen Cao: Brad I consult with the data. We did a one year study at University of Washington and-

Brad Gettleman: Can you email it to me? I'd love to read it.

Densen Cao: Yeah, we definitely can send to you. The key right now, we definitely need more testing for sure, but we want to kill bacteria, but we don't want to kill all the bacteria, right?

Brad Gettleman: I'm adjunct faculty at UMKC School of Dentistry in the grad endo department. If you want to do more research in other locations, I can help you with that too. I'll be doing research and implications is key.

Densen Cao: Sure. 

Brad Gettleman: As far as your-

Densen Cao: Exactly. Endo is-

Brad Gettleman: I mean if you're doing research in multiple locations, that's real important to get not the kind-

Densen Cao: Sure.

Brad Gettleman: I can set you up at the University of Minnesota, but I'm adjunct faculty at KC graduate department school down-

Densen Cao: Alright. 

Brad Gettleman: If you want to work with a grad student, I can line that up too.

Densen Cao: How hard KC dental school become? My daughter applying dental school this year. 

Brad Gettleman: Who the heck knows. We're-

Howard Farran: I want to introduce you to the smartest man next to me. These guys  [inaudible 01:05:10]

Chris: You're Brad Gettleman?

Brad Gettleman: Yeah. You're?

Chris: I'm Chris Boltcheck.

Brad Gettleman: Nice to meet you.

Howard Farran: Dr. Chris Boltcheck invented the only 100% way to sterilize root canal. What he does is he takes his patients and he cremates them until they're-

[crosstalk 01:05:33]

Brad Gettleman: Until now, that's the only way to do it. Nice meeting you.

Densen Cao: Nice to meet you too. 

[crosstalk 01:05:41]

Howard Farran: Here, talk to Dr. Densen Cao, he's the one who invented the diode laser, the LED curing light, he invented all of these LED curing lights that we use. 

Chris: Very good.

Howard Farran: There's the man.

Chris: How do you pronounce your name sir?

Densen Cao: Densen Cao.

Chris: Good to meet you, Chris Boltcheck. 

Densen Cao: Good to meet you. 

[crosstalk 01:06:09]

Chris: Where are you located?

Densen Cao: Salt Lake City.

Chris: Oh, very good.

Densen Cao: Yeah.

Chris: How long have you been in Salt Lake?

Densen Cao: This is my 31 year anniversary.

Chris: Oh, very good. 

Densen Cao: Yeah.

Chris: Are you often on Howard's show?

Densen Cao: No this is the first time.

Chris: Oh it is?

Densen Cao: We have never met each other before and just because Gordon Christensen mentioned my name and knew Howard connect me. I thought, "Oh that will definitely be good talking with Howard."

Chris: Oh, very good. Hold on one second. LED dental curing lights, modern diode laser ... What university are you associated with?

Densen Cao: No ...

Chris: Your own?

Densen Cao: I own my own company so ...

Chris: Okay, very good. Did you already do your podcast with Howard?

Densen Cao: I think we are almost done.

Chris: Oh. It's very good to meet you. Oh you came in '86. 

Densen Cao: Yeah.

Chris: What province?

Densen Cao: Heilongjiang.

Chris: I will let you continue with Howard. It was very good to meet you.

Densen Cao: Nice to meet you too. 

Dr. Hadfield: Hi, I'm Dr. Hadfield. Welcome. Let's talk about curing lights. CAO, the pioneer of LED technology has developed a new light called the Assemp PX. Let's take a look at some of the features of this light. 

One of the first things you noticed the Assemp Px is its sleek design. It works with any photo initiator and fits all standard hand piece holders. The long, narrow wand provides an advantage as it rotates a full 360 degrees. The low profile head makes it easy to access all areas of the mouth. The Assemp PX is a fast LED with a high intensity and wide spectrum output. The unique reflection allows you to cure all dental materials fast and completely. A thorough cure only takes about 5 seconds. When you're finished using the Assemp PX, you can detach the end of the light to sanitize it with approved antimicrobial cleaners. The long life lithium ion battery allows one charge to last up to three days and provide nearly 200 full power cycles. The unit can become usually corded if needed.

The Assemp PX is a fantastic light. In fact, it's the light I use in my office. For more information, go to

Category: dental, Podcast
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