NBDE Part II - 1993 Exam D QUESTIONS AND ANSWERS 100% CORRECT

The dentist plans to place a crown on a patient's maxillary canine. Altering the existing canine-guided occlusion in a right-lateral excursive movement to that of a group-function will result in which of the following? A. Greater clearance on the left side-less potential for a non- working contact B. Less clearance on the left side--greater potential for a non-working contact C. No effect on the non-working side clearance Correct Answer: B. Less clearance on the left side--greater potential for a non-working contact Which of the following is the LEAST effective for enhancing orthodontic anchorage? A. Use of extraoral force B. Use of .018 round wire in a .022 rectangular slot C. Attachment to a greater number of teeth D. Wider force distribution in the periodontal ligament Correct Answer: B. Use of .018 round wire in a .022 rectangular slot Which of the following best explains why drugs that are highly ionized tend to be more rapidly excreted than those that are less ionized? The highly ionized are A. less lipid soluble. B. less water soluble. C. more rapidly metabolized. D. more extensively bound to tissue. Correct Answer: A. less lipid soluble. Non-perforating internal resorption is best managed by A. surgical curettage. B. incision and drainage. C. root canal treatment. D. calcium hydroxide pulpotomy. E. periodic evaluation and recall. Correct Answer: C. root canal treatment. What is the mode of the following data set? 1, 1, 1, 1, 2, 2, 3, 3, 7, 9 (n=10; sum=30) A. 1 B. 2 C. 3 Correct Answer: A. 1 Radiographs of a patient's teeth reveal that the crowns are bulbous; the pulps, obliterated; and the roots, shortened. These findings are associated with which of the following? A. Porphyria B. Pierre Robin syndrome C. Amelogenesis imperfecta D. Osteogenesis imperfecta E. Erythroblastosis fetalis Correct Answer: D. Osteogenesis imperfecta Because of its root structure, which of the following teeth is the LEAST responsive to rotation forces during extraction? A. Mandibular canine B. Maxillary central incisor C. Maxillary first premolar D. Mandibular first premolar E. Mandibular second premolar Correct Answer: C. Maxillary first premolar A teen-aged patient presents with numerous proximal carious lesions that undermine the occlusal enamel. Which of the following is the treatment-of-choice? A. Restore involved teeth with onlays to preserve occlusion B. Restore involved teeth as rapidly as possible using dental amalgam C. Place the patient on a prevention regimen and delay treatment until the effectiveness of home care is evaluated Correct Answer: B. Restore involved teeth as rapidly as possible using dental amalgam Which of the following dimensions are compared in the transitional dentition analysis? A. Arch width to arch length B. Leeway space to freeway space C. Leeway space to size of tooth D. Space available to space required E. The arch perimeter of the primary and transitional dentition Correct Answer: D. Space available to space required Which of the following groups of drugs is CONTRAINDICATED for patients who have glaucoma? A. Adrenergic B. Cholinergic C. Anticholinergic D. Adrenergic blocking Correct Answer: C. Anticholinergic Which of the following cells in the inflammatory infiltrate of an acute periodontal abscess are the MOST numerous? A. B-lymphocytes B. T-lymphocytes C. Macrophages D. Plasma cells E. Neutrophils Correct Answer: E. Neutrophils Which of the following best explains why the dentist should provide a postpalatal seal in a complete maxillary denture? The seal will compensate for A. errors in fabrication. B. tissue displacement. C. polymerization and cooling shrinkage. D. deformation of the impression material. Correct Answer: C. polymerization and cooling shrinkage. An employee has just terminated employment in a dental office. The dentist-employer should retain this individual's medical records for how many more years? A. 1 B. 3 C. 10 D. 30 Correct Answer: D. 30 Oral cytology smears are MOST appropriately used for the diagnosis of which of the following? A. Pseudomembraneous candidiasis B. Lichen planus C. Squamous cell carcinoma D. Benign mucous membrane pemphigoid Correct Answer: A. Pseudomembraneous candidiasis Which of the following represents the appropriate way for a practitioner to manage a patient's hostility and anger? A. Using one's authority as a dentist and issuing a firm warning B. Allowing the patient to control the situation C. Attempting to extinguish the behavior by ignoring it D. Identifying the underlying source of the patient's anger Correct Answer: D. Identifying the underlying source of the patient's anger Why is a matrix for a Class II dental amalgam restoration extended occlusally to the cavity preparation? A. It serves as a guide to determine the completed restoration. B. It allows for overfilling the amalgam. C. It prevents escape of the amalgam during condensation. Correct Answer: B. It allows for overfilling the a