NBDE Test 1986

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NBDE Test 1986
2010-02-24 22:00:42
Dental Anatomy Occlusion

Dental anatomy and occlusion
Show Answers:

  1. Arrange the three furcations of a maxillary first molar from closest to farthest from the cervical line.
    (a) Facial (b) Mesial (c) Distal
  2. Which of the following teeth have sharp demarcations between pulp chambers and pulp canals?
    A) Maxillary lateral incisors B) Mandibular second premolars C) Mandibular canines D) Maxillary first premolars
    D because of the mesial root concavity
  3. The contact area, a self-protective feature of the dentition, functions to:
    (a) prevent food impaction;
    (b) distribute occlusal forces;
    (c) protect mucosal tissues;
    (d) form embrasures;
    (e) stabilize the dental arch.

    A) (a), (d) and (e)
    B) (c) and (d)
    C) (e) only
    D) (b) and
    (d)E) (a), (b) and (c)
  4. Which of the following primary teeth has a distinctly prominent facial cervical ridge that makes it uniquely different from other teeth?

    A) Mandibular first molar
    B) Maxillary central incisor
    C) Maxillary second molar
    D) Mandibular canine
    E) Maxillary canine
    A. mandibular 1st molar
  5. Identify the permanent anterior tooth that most frequently exhibits a bifurcated root and identify the positions of the roots
    Mandibular canine: facial and lingual
  6. When an adult with normal occlusion moves his mandible from right lateral relation to centric occlusion, which cusp moves between facial cusps of the maxillary right second molar?

    A) Distal cusp of the mandibular first molar
    B) Distofacial cusp of the mandibular second molar
    C) Mesiofacial cusp of the mandibular third molar
    D) Mesiofacial cusp of the mandibular second molar
    E) Distofacial cusp of the mandibular first molar
  7. In an adult, which of the following occur normally while swallowing?

    (a) Masseter muscles contract;
    (b) The suprahyoid group of muscles relaxes;
    (c) Teeth come into occlusal contact;
    (d) The tip of the tongue touches the roof of the mouth.
    A) (a), (c) and (d)B) (a), (b) a n d (c)C) (b), (c) and (d)D) All of the aboveE) (a), (b) and (d)

    • A)
    • - palatoglossus brings tongue up and back
    • - suprahyoid muscles contract to raise hyoid; pharynx pulls up (epliglottis closes airway)
    • - pharyngeal constrictors perform wavelike action (CN IX, X, XI)
    • - nasopharynx blocked off
  8. In an otherwise normal arrangement, which of the following teeth are most often in abnormal relation and contact with adjacent teeth in the same arch?
    maxillary lateral incisors

  9. Assuming occlusion and alignment are normal, the arrow on the sketch represents the path taken by the

    A) mesiolingual cusp of a first molar.
    B) facial cusp of a second premolar.
    C) lingual cusp of a second premolar.
    D) facial cusp of a first premolar
    E) lingual cusp of a first premolar.
  10. Which of the following permanent teeth have mesial concavities that require special attention when removing calculus deposits?: (a) Maxillary central incisors; (b) Maxillary first premolars; (c) Maxillary first molars; (d) Mandibular second premolars
    B and C

    • - Maxillary 1st premolar has mesial concavity
    • - Maxillary 1st molars- only tooth with pronounced distal concavity at CEJ
  11. The facial masticatory mucosa (attached gingiva) is narrowest on which mandibular tooth?
    1st premolar

  12. The mandibular movement indicated isA) left lateral, working side.B) protrusive.C) left lateral, non-working side.D) right lateral, working side.E) right lateral, non-working side.
    left lateral non-working side
  13. In which of the following molars is the mesial fossa most distinctly separated from the remainder of the occlusal table by a transverse ridge?

    A) Maxillary secondB) Mandibular secondC) Mandibular firstD) Maxillary first
  14. In a normal occlusion, mandibular central incisors contact maxillary incisors in which of the following movements?:

    (a) Protrusive; (b) Lateral (working); (c) Lateral (non-working); (d) Lateral protrusive
    A and D
  15. A lingual pit is most common on which of the following teeth?
    maxillary lateral incisor

    - also a distolingual groove

  16. A) Left lateral, working sideB) ProtrusiveC) Left lateral, non-working sideD) Right lateral, working sideE) Right lateral, non-working side
  17. From a proximal view, which of the following permanent teeth tends to be positioned in the arch with its axis most nearly vertical?
    maxillary canine
  18. The lingual surface of the crown of a mandibular canine is smooth and: (a) relatively flat in the fossa area; (b) poorly developed in the marginal ridge area; (c) poorly developed in the cingulum area.

    A) (a) and (b)B) (c) only C) All of the aboveD) (a) onlyE) (b) onlyF) (b) and (c)
    C all of the above
  19. How soon after eruption of a permanent tooth is the apex usually fully developed?
    2-3 yrs
  20. The design of a restored occlusal surface is dependent upon the:
    (a) contour of the articular eminence;
    (b) position of the tooth in the arch;
    (c) amount of lateral shift in the rotating condyle;
    (d) amount of vertical overlap of anterior teeth.
    all of the above
  21. The oblique ridge on a permanent maxillary first molar is reduced in height in the center of the occlusal surface and is nearly level with the

    A) triangular ridge of the mesiofacial cusp.B) marginal ridge.C) None of the aboveD) cusp tip of the distofacial cusp.
    B marginal ridge

  22. A) mesiofacial cusp of a third molar.B) distofacial cusp of a second molar.C) distolingual cusp of a second molar.D) mesiofacial cusp of a second molar.E) mesiolingual cusp of a second molar.
  23. During nonmasticatory swallowing, teeth are usually

    A) in contact in intercuspal position.
    B) protruded.
    C) None of the above. This is a nonexistent act.
    D) in a working arrangement.
  24. The tooth most likely to exhibit a lingual groove that extends from the enamel onto the cemental area of the root is a permanent
    maxillary lateral incisor
  25. When viewed from the mesial or the distal, the overall facial outline from cusp tip to root apex of a mandibular canine is:
    (a) made up of two arcs;
    (b) made up of one continuous arc;
    (c) different from the outline of a maxillary canine;
    (d) very similar to the outline of a maxillary canine.

    A) (b) and (c)B) (a) and (c)C) (d) onlyD) (a) and (d)E) (b) and (d)
    A) B and C

    - maxillary canine has a more prominent labial ridge
  26. The ideal position and height of lingual cusps of a mandibular first molar accommodate which of the following?
    A) Non-working movement
    B) Centric relation
    C) Working movement
    D) Maximum intercuspation
    E) Protrusive position
    C working movement