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Q: Which injection anesthetizes the maxillary posterior teeth?
(A). Inferior alveolar nerve block(B). Posterior superior alveolar nerve block(C). Middle superior alveolar nerve block(D). Greater palatine nerve blockKeyword: teeth Posterior superior alveolar (PSA) nerve block: anesthetizes the maxillary first/second/third molars, periodontal tissues, buccal...  Read More
Q: Which heart condition requires premedications?
(A). Calcified aortic stenosis(B). Rheumatic heart disease(C). Ventricular septal defect(D). Artificial heart valvesThe conditions that require antibiotics prior to dental care according to the most recent American Heart Association guideline (2012) are: Cardiac transplantthat develops cardiac...  Read More
Q: Which drug falls under pregnancy category B?
(A). Carbocaine(B). Marcaine(C). Citanest(D). SeptocaineThe question needs to be solved in 2 parts: The answer choices show brand names of drugs, but what are their generic names? Let’s memorize them here: Citanest (prilocaine), Xylocaine (lidocaine), Carbocaine (mepivacaine), Marcaine...  Read More
Q: Which condition is NOT caused by a virus?
(A). Hand-foot-mouth disease(B). Herpes labialis(C). Infectious mononucleosis(D). Candidiasis Candidiasisis caused by thefungusCandida albicans. Herpeslabialis is caused by a group ofvirusescalled human herpes viruses. Hand foot mouth diseaseis caused by the Coxsackievirus. Infectious...  Read More
Q: Which of the following is a facial bone?
(A). Occipital(B). Parietal(C). Sphenoid(D). Zygomatic(E). FrontalThere are 22 bones in the skull (8 cranial bones and 14 facial bones), excluding the middle ear ossicles.8cranialbones: occipital bone 2 temporal bones 2 parietal bones sphenoid bone ethmoid bone frontal...  Read More
Q: Which bacteria are mainly involved in caries formation?
(A).Streptococcussalivarius(B).Streptococcusmutans(C).Streptococcussanguis(D).PorphyromonasgingivalisKeyword: cariesThe mouth is colonized by 200 to 300 bacterial species, but only a limited number of these species participate in dental decay (caries) or periodontal disease. ...  Read More
Q: Where are the lingual tonsils located?
(A). Posterior to the circumvallate lingual papillae(B). On lateral border of the tongue(C). Along the sulcusterminalisof the tongue(D). Spread evenly on the entire surface of the tongueThere are different types of tonsils and papillae on the tongue: Lingual tonsilsare an irregular mass of...  Read More
Q: When is a package considered to be contaminated?
(A). When it is dropped on the floor(B). When it is punctured(C). When it is wet(D). All of the aboveBefore opening a dental instrument package, examine it carefully chair side. Packages that are dropped on the floor, punctured,torn,or wet are considered contaminated. In those events, repackage and...  Read More
Q: Which radiographic error caused this “flat” smile?
(A). Lead collar is above the line(B). The chin is tipped down too far(C). The chin is tipped up too far(D). The patient’s head is twistedThewill show you panoramic radiographs and ask you what type of error was made. There is a whole list of errors that you need to memorize! As we know,...  Read More
Q: What happens in the depolarization of a nerve?
(A). Sodium ions exit the nerve membrane(B). Sodium ions enter the nerve membrane(C). Both sodium ions and potassium ions enter the nerve membrane(D). Both sodium ions and potassium ions exit the nerve membraneKeyword: depolarizationNerve conduction (and recovery) follows the steps of...  Read More
Q: This unusual incisor shape is most likely caused by:
(A). Syphilis(B). Attrition(C). Erosion(D). FluorosisThe maxillary central incisors in this image feature an unusual indentation which is characteristic ofcongenital syphilis. Those malformed incisors are called “screwdriver-shaped” incisors. Besides abnormal incisors, congenital...  Read More
Q: This type of swelling is a(n):
(A). Ranula(B). Mucocele(C). Exostosis(D). UlcerThe image shows a rounded elevation that looks like it may contain some fluid and is located on thelower lip. Amucoceleis a benign, mucus-containing cystic lesion of theminorsalivary gland. It can appear with any minor salivary glands, but the most...  Read More
Q: The mental nerve block anesthetizes the:
(A). Lingual gingiva of the mandible(B). Facial gingiva of the mandibular anterior teeth(C). Buccal gingiva of the mandibular molars(D). All teeth posterior to the mental foramenThe mental nerve is a terminal branch of the inferior alveolar nerve that exits through themental foramenlocated on the...  Read More
Q: The infraorbital nerve block does NOT affect the:
(A). Anterior superior alveolar nerve(B). Middle superior alveolar nerve(C). Posterior superior alveolar nerve(D). Infraorbital nerveThe infraorbital nerve block anesthetizes the infraorbital nerve branch that passes through the infraorbital foramen andsplits intothe anterior superior alveolar...  Read More
Q: Solar cheilitis is more common in:
(A). Immunocompromised patients(B). Dark-skinned adults(C). Patients undergoing cancer therapy(D). Fair-skinned adultsSolar cheilitis, also calledactinic cheilitisoccurs more commonly infair-skinnedindividuals. Here are some more characteristics(bullet point style, that's what we like at StudentRDH...  Read More
Q: The senses of the anterior third of the tongue are provided by which cranial nerve?
(A). Fifth(B). Ninth(C). Eighth(D). TwelfthKeywords: senses, anterior thirdThis is a very difficult question in my opinion. But we will dissect it together so you are more ready for the dental hygiene board exam (NBDHE, NDHCE). First of all, we know that there are12 cranial nerves, like a dozen...  Read More
Q: A black line stain is generally related to:
(A). Chlorhexidine(B). Clean mouth(C). Black tea(D). TobaccoBlack line stainis usually related to acleanmouth. It is anextrinsic stainthat can be removed. Some scientific research suggests that it is associated with iron compounds (ferric sulfide) and betel leaf chewing habits. The bacteria found...  Read More
Q: 80, 85, 67, 90, 86, 87, 85, 90, 83, 75, 89, 82, 82, 88, and 85. What is the mode?
(A). 75(B). 80(C). 85(D). 90 Themodeis the value that ismostfrequently observed. In this case, 85 is observed 3 times. Themedianis the number that separates the data intotwo halves. (If there are two middle numbers, get their average). In this case, the median is also 85. Themeanis...  Read More
What happens with depolarization of a nerve?
Local Anesthesia | For the WREB, CDCA Dental Hygiene Board ExamQ: What happens with depolarization of a nerve?(A). Sodium ions exit the nerve membrane(B). Sodium ions enter the nerve membrane(C). Both sodium ions and potassium ions enter the nerve membrane(D). Both sodium ions and potassium ions...  Read More
Which of the following routes CANNOT spread HIV?
(A). Blood(B). Breast milk(C). Vaginal fluids(D). Saliva HIV (human immunodeficiency virus) invades T lymphocyte cells in the body.The virus can be transmitted only by certain bodily fluids such as blood, semen, rectal fluids, vaginal fluids, and breast milk.The virus must come in contact with a...  Read More
The piezoelectric scaler tip moves in which pattern?
(A). Linear(B). Round(C). EllipticalPiezoelectric scaler uses ceramic discs or quartz plates to convertelectricity to movement. The tip moves in a linear pattern (front andback) with the two sides of the tip move at 25,000 to 50,000 cycles/sec(cps). The tip moves in an elliptical motion, at 18,000...  Read More
The force of attraction between unlike atoms and molecules is called:
(A).Cohesion(B).Viscosity(C).Mechanical bonding(D).AdhesionKeywords: unlikeThe force of attraction between unlike atoms and molecules on two different surfaces is called adhesion (e.g., a water molecule is attracted to a tree leaf). The chance of adhesion is directly proportional to the amount of...  Read More
The basic unit of the tooth enamel is the:
(A). Enamel rod(B). Enamel tuft(C). Enamel spindle(D). Enamel lamellaeEnamel consists of small fish-shaped rods (prisms) that are lined up next to each other, collectively forming the enamel. Those rods extend from the DEJ (dentino-enamel junction) to the enamel surface. Enamel tufts are defects...  Read More
Which instrument type and cross-sectional shape are matched correctly?
(A). Explorer - half moon(B).Universal curette - circle(C).Sickle - triangle(D).Area-specific curette - rectangleThe design of the working end and its cross-sectional shape are directly related to the function of the instrument. Half-moon cross-sectional shape instrument: rounded at the back....  Read More
Which cell component synthesizes lysosomes?
(A). Cell membrane(B). Golgi complex(C). Cytoplasm(D). Endoplasmic reticulumEukaryotes or normal cells are composed the following: Golgi complex: stack of sacs that packages and distributes proteins out of the cell. The complex also synthesizes lysosomal cells, which break down the foreign...  Read More
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