NBDE 2004 released exam questions &
answers
1. The highest incidence of caries around Class II composite resin restorations occurs on which of the
following margins? - ANSWERSGingival 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? - ANSWERSResistance 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; - ANSWERSDecalcified 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? - ANSWERSPreparation 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? - ANSWERSExtension for prevention.
6. The axial walls in an MOD cavity prepared for a cast gold onlay should. - ANSWERSConverge 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? - ANSWERSRetracting the gingival with
a clamp and rubber dam.
8. Which of the following is the primary reason for using a custom ring liner? - ANSWERSAllowing
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? - ANSWERSThe mesio-lingual cusp of a maxillary first molar.
, 10. Which has the highest coefficient of thermal expansion? - ANSWERSResin
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? - ANSWERSTooth #31
12. During shade selection for a composite resin, which shade parameter is most perceptible? -
ANSWERSValue
13. A gingival margin trimmer differs from a hatchet by which of the following? - ANSWERSAngle 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? - ANSWERSInadequate depth of restoration.
15. Gingival irritation during dentist supervised at-home bleaching procedures is best minimized by; -
ANSWERSProper tray design
16. A conservative class II preparation for dental amalgam should have which of the following
characteristics? - ANSWERSIndependent retention and resistance form for proximal and occlusal
portions.
17. Which most appropriate sequence when restoring a case is indicated? - ANSWERSControl 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; - ANSWERSLingual 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? - ANSWERSThe pulpal floor will be parallel to the occlusal plane of
the tooth.
answers
1. The highest incidence of caries around Class II composite resin restorations occurs on which of the
following margins? - ANSWERSGingival 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? - ANSWERSResistance 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; - ANSWERSDecalcified 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? - ANSWERSPreparation 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? - ANSWERSExtension for prevention.
6. The axial walls in an MOD cavity prepared for a cast gold onlay should. - ANSWERSConverge 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? - ANSWERSRetracting the gingival with
a clamp and rubber dam.
8. Which of the following is the primary reason for using a custom ring liner? - ANSWERSAllowing
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? - ANSWERSThe mesio-lingual cusp of a maxillary first molar.
, 10. Which has the highest coefficient of thermal expansion? - ANSWERSResin
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? - ANSWERSTooth #31
12. During shade selection for a composite resin, which shade parameter is most perceptible? -
ANSWERSValue
13. A gingival margin trimmer differs from a hatchet by which of the following? - ANSWERSAngle 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? - ANSWERSInadequate depth of restoration.
15. Gingival irritation during dentist supervised at-home bleaching procedures is best minimized by; -
ANSWERSProper tray design
16. A conservative class II preparation for dental amalgam should have which of the following
characteristics? - ANSWERSIndependent retention and resistance form for proximal and occlusal
portions.
17. Which most appropriate sequence when restoring a case is indicated? - ANSWERSControl 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; - ANSWERSLingual 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? - ANSWERSThe pulpal floor will be parallel to the occlusal plane of
the tooth.
