NBDE Part II -2006 Exam C| QUESTIONS AND ANSWERS| 100% CORRECT

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Addition cured silicones (polyvinyl siloxanes) are often the material of choice for impressions for fixed restorations. Each of the following is true about these materials EXCEPT one. Which one is thi... s EXCEPTION? A. Give off ethyl alcohol during their setting reaction B. Can be poured more than once and still remain accurate C. Can be poured after 24 hours and still remain accurate D. Rebound from undercuts without permanent deformation E. May release hydrogen gas during setting Correct Answer: A. Give off ethyl alcohol during their setting reaction Which of the following describes the laterotrusive movement (Bennett angle)? A. It is the angle that is formed by the non-working condyle and the sagittal plane during lateral movements. B. It is the angle that is formed by the condyle and the horizontal plane during protrusive movements. C. It is the difference in condylar inclination between protrusive and lateral movements. D. It is the difference between the condylar and incisal inclinations. Correct Answer: A. It is the angle that is formed by the non-working condyle and the sagittal plane during lateral movements. In selecting an impression tray for a preliminary maxillary impression, how far should the tray extend posteriorly? A. To the tuberosity B. To the fovea palatine C. Beyond the vibrating line D. To the pterygomaxillary notches Correct Answer: C. Beyond the vibrating line Occlusal morphology is determined by the height of the cusp and the depth of the fossa. Each of the following is a vertical component of this morphology EXCEPT one. Which one is this EXCEPTION? A. Side shift B. Intercondylar distance C. Curve of Spee D. Horizontal overlap of anterior teeth Correct Answer: B. Intercondylar distance Why is it advisable to dispense the liquid component of cement immediately before mixing? A. To avoid absorption of moisture from the air B. To avoid spreading over a large area of the slab C. To allow tempering of the powder by the mixing slab D. To reduce the temperature influence of the mixing slab E. To prevent evaporation of the volatile components Correct Answer: E. To prevent evaporation of the volatile components Which of the following groups of muscles are influential in molding the lingual border of the final mandibular impression for a complete denture? A. Hyoglossus, mylohyoid, medial pterygoid, digastric B. Mylohyoid, styloglossus, medial pterygoid, depressor anguloris C. Palatoglossus, superior pharyngeal constrictor, mylohyoid, genioglossus D. Genioglossus, mylohyoid, middle pharyngeal constrictor, posterior belly of the digastric Correct Answer: C. Palatoglossus, superior pharyngeal constrictor, mylohyoid, genioglossus Which of the following represents the MOST likely cause of plastic denture teeth being dislodged from the acrylic resin of the denture base? A. Excessive occlusal forces applied B. Occlusal surfaces adjusted excessively C. Retentive undercuts not placed in the teeth D. Residual wax on teeth when processing Correct Answer: D. Residual wax on teeth when processing Which of the following represents the optimal incisal reduction for a metal-ceramic crown preparation? A. 1.0 mm B. 1.5 mm C. 2.0 mm D. 2.5 mm E. 3.0 mm Correct Answer: C. 2.0 mm All-ceramic crowns should NOT be used for patients who are associated with each of the following conditions EXCEPT one. Which one is the EXCEPTION? A. Severe bruxism B. Previous history of ceramic crown fractures C. Amalgam restorations with marginal breakdown D. Extensive wear of tooth structure or restorations Correct Answer: C. Amalgam restorations with marginal breakdown A static positional record can be used to adjust posterior articulator controls. In order to set the left condylar inclination and the left sideshift, which of the following are minimally required? A. Protrusive checkbite in incisal edge-to-edge position B. Protrusive checkbite in extreme protrusive position C. Right lateral excursive record D. Left lateral excursive record Correct Answer: C. Right lateral excursive record The long-term prognosis of a single-abutment cantilever fixed partial denture may be compromised, because forces are best tolerated by the periodontal supporting structures when directed in the long axes of the teeth. A. Both the statement and the reason are correct and related. B. Both the statement and the reason are correct but NOT related. C. The statement is correct, but the reason is NOT. D. The statement is NOT corr [Show More]

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