We all know that one of the largest segments of the U.S.
population is over 65. We all know that this section of
the population has a great deal of economic buying
power. But as dentists very few of us cater to this population by
offering cost-effective solutions to help them live the rest of their
lives enjoying one of the things we all like to do - eat.
As the average life span increases and the number of totally
edentulous arches increases, these patients will suffer from poor
nutrition. This can be greatly improved with the use of implants
that are adequately sized to fit in the residual ridges. With the average
person over 75 being on more than 11 drugs, additional preprosthetic
surgery might not be necessary, case acceptance can rise,
potential surgical complications can be avoided and a minimally
invasive procedure can be completed with a high success rate.
Most of the small-diameter (mini) implants on the market today
use the O-ring attachment as their retentive element. While this has
worked well over the past decade, the height needed can create
restorative issues, such as bulky acrylic areas or over-contoured areas
in the palate. With the recent creation of the LODI (Locator
Overdenture Implant), a low-profile attachment solution now exists.
In addition to the lower height, the ability to change the amount of
retention is also an option. Retention up to 5 lbs. is possible.
Case Report
A 56-year-old woman presented with a fully edentulous
upper and lower arch. She reported that the teeth have been
missing for more than 25 years and that she has been wearing
full dentures for that entire time and is now on her fourth set.
The upper denture has been well-fitting and does not require
any adhesive products at this time. Her chief complaint was her
ill-fitting lower denture. As an anecdotal comment, I have rarely
met patients who liked their lower full dentures. With so many patients with ill-fitting lower dentures, I am at a loss as to why
our profession does not make denture stabilization more accessible
and affordable. The patient’s request was to add some
“screws” to help hold her denture in place. I think it is important
to note that most seniors now know there exists something
to help them with their dentures other than adhesives. They may
not call them implants but they are aware, and in some cases
know someone who has implants, and will actively seek out dental
offices that are well qualified to provide this service for them.
Clinical examination revealed a thin atrophic residual alveolar
ridge (Fig. 1). Ridge calipers (ACE Surgical) were used to determine
buccal lingual dimension at around 4mm in most areas
between the mental foramen. Based off this information, a CT
scan was decided on to help determine the best size implants to
utilize, as well as locations. The patient was sent to get a CT scan
(i-CAT FLX). The vast improvements in i-CAT digital technology
now can offer a full 3D scan with radiation doses similar or
lower than some panoramic images. The DICOM file was then
seamlessly uploaded to 3DDX (3D Diagnostics) for conversion
and treatment planning (Simplant). With the use of this service I
can easily see where the most ideal areas are for the implants,
as well as where they will be contained in the prosthesis (Figs. 2
and 3). This does require a dual scan where the patient scan is
taken with radiographic markers placed in the existing denture
(Fig. 4). Rather than make a radiographic scan appliance, nine
dots of radiopaque composite (VOCO Grandio Flow) were
placed on the denture in various locations to accomplish this. An
additional scan of just the denture was also taken. These two scans
were then merged together by the 3DDX technicians giving us
the ability to generate a prosthetically driven treatment plan.
Once implant size and location were agreed upon, a surgical guide
was fabricated (Materalize) (Fig. 5). It is important to note that
this is not just a prosthetic guide (a suck down template on a stone
model from locations determined on a 2D pan X-ray), but a true
surgical guide digitally made from only the CT scan. For this case,
to stay within the thin ridge, five 2.9mm Locator Overdenture
Implants (LODI) were selected.
On treatment day the surgical guide was tried in and assessed
for fit. I like to utilize only a pilot guide (one where only the pilot
bit will pass through the guide tubes) (Fig. 6). Once the pilot
osteotomies are made, a blunt-ended endodontic probe is used to
confirm there are no perforations of the buccal or lingual plates.
Parallel pins were placed to assess the orientation and if any corrections
needed to be made prior to implant placement (Fig. 7).
As with most of my cases, I prefer to place the implant with a
handpiece (Aesptico AEU-7000) (Fig. 8).This helps me keep a
constant speed to prevent overheating the bone as well as keep
the driving torque on the long axis to the implant. One by one
the LODI implants were removed from the sterile vails and
inserted in the A, B, C, D and E positions. Because these are twopiece
implants, the Locator attachment was then placed and
torqued to 30Ncm on all five implants (Fig. 9).
The existing denture was then loaded with FitCheck material
(VOCO) and seated over the Locators. In 30 seconds the
exact areas where relief would be needed in the denture could
be identified with ease (Fig.10). A cylinder-shaped ceramic cutter
(Komet) was used in the Aseptico handpiece to create the
relief wells. The denture could then be soft lined (UfiGel
VOCO) during the healing phase while a new denture was
being fabricated.
With the addition of small-diameter implants such as the
Locator Overdenture Implants thin ridges can now benefit from
straightforward denture stabilization with the huge benefit of
a well-tested and patient-approved attachment
(Fig. 11). I encourage restorative-minded dentists
who wish to incorporate a few additional
surgical techniques into their offices to consider
getting the implant training they need and offer
overdentures with the Locator attachment. You
will find great success for your practice as well
as offering a service to a well-deserving section
of our population.
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