Nbde Released Exam Questions With Complete Solutions

1. The highest incidence of caries around Class II composite resin restorations occurs on which of the following margins? - Gingival Proximal 2. In a Class II cavity preparation, preparing the gingival wall at a right angle to the long axis of the tooth is a function of which of the following? - Resistance Form 3. While preparing tooth #9 for an ideal class II distal composite, the enamel on the gingival seat has the appearance of etched enamel. The enamel is; - Decalcified and should be included in the preparation 4. One month after treatment of tooth #5, a properly placed composite restoration on an abfraction popped out. Which of the following options is least indicated concerning placement of a new restoration? - Preparation of a conventional class V to retain the restoration. 5. Each of the following determines the outline form for a Class III composite restoration except one. Which is the exception? - Extension for prevention. 6. The axial walls in an MOD cavity prepared for a cast gold onlay should. - Converge from the gingival walls to the pulpal wall. 7. The dentist will use composite resin to restore a Class V facial lesion that extends slightly subgingivally. Which of the following isolation techniques is most appropriate? - Retracting the gingival with a clamp and rubber dam. 8. Which of the following is the primary reason for using a custom ring liner? - Allowing uniform setting expansion of the investment. (Indirect Restorations) 9. In normal occlusion, which of the following cusps moves between lingual cusps of a mandibular first molar in lateral excursion? - The mesio-lingual cusp of a maxillary first molar. 10. Which has the highest coefficient of thermal expansion? - Resin 11. A patient needs a DO amalgam restoration on #29, #30, and #31, which will be restored in the same appointment. Which tooth should be restored first? - Tooth #31 12. During shade selection for a composite resin, which shade parameter is most perceptible? - Value 13. A gingival margin trimmer differs from a hatchet by which of the following? - Angle of the blade edge. 14. A patient presents with an amalgam restoration fracture at the isthmus six months after placement. What is the most likely cause? - Inadequate depth of restoration. 15. Gingival irritation during dentist supervised at-home bleaching procedures is best minimized by; - Proper tray design 16. A conservative class II preparation for dental amalgam should have which of the following characteristics? - Independent retention and resistance form for proximal and occlusal portions. 17. Which most appropriate sequence when restoring a case is indicated? - Control pain, perform comprehensive exam, and treat advanced caries. 18.A fracture of a recently placed class II DO silver amalgam in tooth #29 in a patient with a class I occlusion is most likely caused by; - Lingual cusp of tooth #4 19. A patient has an incipient lesion on the mesial of a mandibular 1st premolar. The lesion exhibits slight penetration into dentin. The transverse ridge is pronounced and intact. The correct cavity preparation is described by which of the following? - The pulpal floor will be parallel to the occlusal plane of the tooth. 20. A newly condensed amalgam restoration seems to chip away when being carved. What is the most likely cause? - The amalgam was condensed after the working time elapsed. 21. Which of the following cements is least soluble? - Resin 22. Which of the following is the most toxic form of mercury? - Organic 23. An occlusal adjustment of a porcelain restoration is BEST accomplished by using which bur? - Diamond 24. A composite restoration is wider than the diameter of the light tip of the curing unit. In this situation, the restoration is cured by; - Placing the tip stepwise over each area and exposing each area for the required time. 25. Fluoride inhibits caries through each of the following mechanisms EXCEPT; - Stabilizing collagen against acid denaturing. 26. According to ADA specifications, which of the following represents the maximum film thickness of cements used for luting precision castings? - 25 microns. 27. Which of the following effects on caries activity would occur if caries-prone animals were fed cariogenic diets by stomach tubes? - Stopped 28. Each of the following instruments can be used to place gingival bevels on class II inlay preparations EXCEPT; - Enamel hatchets 29. The critical pH in the oral environment below, which the carious process begins; - 5.5 30. A customized impression tray is recommended with an elastomeric impression material because; - It provides uniform thickness of the impression material. 31. Dental plaque is believed to adhere to teeth because; - Dextrans are insoluble and sticky. 32. The removal of caries from the deepest aspect of a cavity preparation should be accomplished with; - A large round bur starting at the periphery of the lesion.