NBDE Part II - 1993 Exam A QUESTIONS AND ANSWERS ALL CORRECT

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. Correct Answer: E. Periapical cemental dysplasia. During which trimester of pregnancy does calcification of teeth begin? A. First B. Second C. Third Correct Answer: 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 Correct Answer: 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 Correct Answer: 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. Correct Answer: 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 Correct Answer: 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 Correct Answer: 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 Correct Answer: 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 Correct Answer: 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 Correct Answer: 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 Correct Answer: 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. Correct Answer: 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. Correct Answer: 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 Correct Answer: 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 Correct Answer: 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 Correct Answer: C. Acute apical periodontitis Which of the following is the best method for evaluating centric occlusion on a newly placed onlay restoration? A. Shim stock