NBDE Part II - Exam A Questions and Answers
A patient has the asymptomatic condition seen in the radiograph. The MOST probable
diagnosis is
A. Hypercementosis.
B. Complex odontomas.
C. Sickle cell anemia.
D. Sclerosing osteitis.
E. Periapical cemental dysplasia. - Answers-E. Periapical cemental dysplasia.
.During which trimester of pregnancy does calcification of teeth begin?
A. First
B. Second
C. Third - Answers-B. Second
.Which of the following principles requires health professionals to inform their patients
about treatment and to protect their confidentiality?
A. Justice
B. Autonomy
C. Beneficence
D. Nonmaleficence - Answers-B. Autonomy
.Each of the following can occur as a result of a successful root canal treatment
EXCEPT one. Which one is this EXCEPTION?
A. Apical seal of cementum
B. Regeneration of alveolar bone
C. Regeneration of the periodontal ligament
D. Formation of reparative dentin - Answers-D. Formation of reparative dentin
.A dentist is preparing Tooth #30 for an occlusal amalgam restoration. Once the ideal
outline form and depth have been established, the dentist notes that caries remains on
the facial, pulpal, and lingual walls of the preparation. The next step in treatment is to
A. Extend the outline form.
B. Remove the caries with a spoon excavator.
C. Remove the caries with a larger round bur. - Answers-A. Extend the outline form.
.A mandibular radiolucency can be seen in the radiograph. This radiolucency could be
diagnosed as each of the following EXCEPT one. Which one is this EXCEPTION?
,A. Odontogenic myxoma
B. Ameloblastoma
C. Traumatic bone cyst
D. Central cell granuloma
E. Odontogenic keratocyst - Answers-C. Traumatic bone cyst
.A needle tract infection following an inferior alveolar block injection would initially
involve which space?
A. Pterygomandibular
B. Sublingual
C. Submandibular
D. Lateral pharyngeal - Answers-A. Pterygomandibular
.Which of the following characteristics most readily distinguishes amelogenesis
imperfecta from dentinogenesis imperfecta?
A. Radiographic appearance
B. Hereditary background
C. Presence of blue sclera
D. Color of the teeth
E. Associated hair loss - Answers-A. Radiographic appearance
.Which of the following factors is the most critical in the determination of prognosis of a
tooth with periodontal disease?
A. Probing depth
B. Mobility of the tooth
C. Amount of attachment loss
D. Presence of furcation involvement - Answers-C. Amount of attachment loss
.Which of the following is derived from the unsaturated fatty acids in cell membranes?
A. Histamine
B. Serotonin
C. Prostaglandins
D. Bradykinin
E. Endorphins - Answers-C. Prostaglandins
.After a threshold stimulus, the cell-membrane permeability becomes altered. The
liberation of which of the following transmitter substances causes this alteration?
A. Acetylcholine
B. Cholinesterase
C. Hydroxycholine
D. Acetylsalicylic acid - Answers-A. Acetylcholine
, .In the radiograph, a radiolucency appears at the apex of the maxillary canine. This
finding represents a (an)
A. Apical rarefying osteitis.
B. Nasal fossa.
C. Ameloblastoma.
D. Maxillary sinus. - Answers-D. Maxillary sinus.
.The strength of a soldered connector of a fixed partial denture is best enhanced by
A. Using a higher carat solder.
B. Increasing its height.
C. Increasing its width.
D. Increasing the gap. - Answers-B. Increasing its height.
.During which of the following stages of tooth development does fused or geminated
teeth occur?
A. Apposition
B. Calcification
D. Eruption and exfoliation
E. Initiation and proliferation - Answers-E. Initiation and proliferation
.Through the Bloodborne Pathogen Standard, the Occupational Safety and Health
Administration (OSHA) directs activity for each of the following EXCEPT one. Which
one is this EXCEPTION?
A. Using barrier techniques
B. Using material safety data sheets (MSDS)
C. Obtaining hepatitis B vaccinations
D. Communicating hazards to employees
E. Performing housekeeping - Answers-B. Using material safety data sheets (MSDS)
.Which of the following is the most likely postoperative complication of bleaching a tooth
that has not been adequately obturated?
A. Fracture
B. Discoloration
C. Acute apical periodontitis
D. Chronic apical periodontitis
E. External cervical root resorption - Answers-C. Acute apical periodontitis
.Which of the following is the best method for evaluating centric occlusion on a newly
placed onlay restoration?
A patient has the asymptomatic condition seen in the radiograph. The MOST probable
diagnosis is
A. Hypercementosis.
B. Complex odontomas.
C. Sickle cell anemia.
D. Sclerosing osteitis.
E. Periapical cemental dysplasia. - Answers-E. Periapical cemental dysplasia.
.During which trimester of pregnancy does calcification of teeth begin?
A. First
B. Second
C. Third - Answers-B. Second
.Which of the following principles requires health professionals to inform their patients
about treatment and to protect their confidentiality?
A. Justice
B. Autonomy
C. Beneficence
D. Nonmaleficence - Answers-B. Autonomy
.Each of the following can occur as a result of a successful root canal treatment
EXCEPT one. Which one is this EXCEPTION?
A. Apical seal of cementum
B. Regeneration of alveolar bone
C. Regeneration of the periodontal ligament
D. Formation of reparative dentin - Answers-D. Formation of reparative dentin
.A dentist is preparing Tooth #30 for an occlusal amalgam restoration. Once the ideal
outline form and depth have been established, the dentist notes that caries remains on
the facial, pulpal, and lingual walls of the preparation. The next step in treatment is to
A. Extend the outline form.
B. Remove the caries with a spoon excavator.
C. Remove the caries with a larger round bur. - Answers-A. Extend the outline form.
.A mandibular radiolucency can be seen in the radiograph. This radiolucency could be
diagnosed as each of the following EXCEPT one. Which one is this EXCEPTION?
,A. Odontogenic myxoma
B. Ameloblastoma
C. Traumatic bone cyst
D. Central cell granuloma
E. Odontogenic keratocyst - Answers-C. Traumatic bone cyst
.A needle tract infection following an inferior alveolar block injection would initially
involve which space?
A. Pterygomandibular
B. Sublingual
C. Submandibular
D. Lateral pharyngeal - Answers-A. Pterygomandibular
.Which of the following characteristics most readily distinguishes amelogenesis
imperfecta from dentinogenesis imperfecta?
A. Radiographic appearance
B. Hereditary background
C. Presence of blue sclera
D. Color of the teeth
E. Associated hair loss - Answers-A. Radiographic appearance
.Which of the following factors is the most critical in the determination of prognosis of a
tooth with periodontal disease?
A. Probing depth
B. Mobility of the tooth
C. Amount of attachment loss
D. Presence of furcation involvement - Answers-C. Amount of attachment loss
.Which of the following is derived from the unsaturated fatty acids in cell membranes?
A. Histamine
B. Serotonin
C. Prostaglandins
D. Bradykinin
E. Endorphins - Answers-C. Prostaglandins
.After a threshold stimulus, the cell-membrane permeability becomes altered. The
liberation of which of the following transmitter substances causes this alteration?
A. Acetylcholine
B. Cholinesterase
C. Hydroxycholine
D. Acetylsalicylic acid - Answers-A. Acetylcholine
, .In the radiograph, a radiolucency appears at the apex of the maxillary canine. This
finding represents a (an)
A. Apical rarefying osteitis.
B. Nasal fossa.
C. Ameloblastoma.
D. Maxillary sinus. - Answers-D. Maxillary sinus.
.The strength of a soldered connector of a fixed partial denture is best enhanced by
A. Using a higher carat solder.
B. Increasing its height.
C. Increasing its width.
D. Increasing the gap. - Answers-B. Increasing its height.
.During which of the following stages of tooth development does fused or geminated
teeth occur?
A. Apposition
B. Calcification
D. Eruption and exfoliation
E. Initiation and proliferation - Answers-E. Initiation and proliferation
.Through the Bloodborne Pathogen Standard, the Occupational Safety and Health
Administration (OSHA) directs activity for each of the following EXCEPT one. Which
one is this EXCEPTION?
A. Using barrier techniques
B. Using material safety data sheets (MSDS)
C. Obtaining hepatitis B vaccinations
D. Communicating hazards to employees
E. Performing housekeeping - Answers-B. Using material safety data sheets (MSDS)
.Which of the following is the most likely postoperative complication of bleaching a tooth
that has not been adequately obturated?
A. Fracture
B. Discoloration
C. Acute apical periodontitis
D. Chronic apical periodontitis
E. External cervical root resorption - Answers-C. Acute apical periodontitis
.Which of the following is the best method for evaluating centric occlusion on a newly
placed onlay restoration?
