72. Which cusp on the primary mandibular first molar is highest and sharpest?

A. Mesiobuccal       B. Distobuccal

C. Mesiolingual        D. Distolingual



ANS.  C. The primary first mandibular molar is a highly unusual tooth. It is molar-like

in form, with two roots (mesial and distal), but has a very pronounced mesial development of the

crown. The mesial section comprises two-thirds of the crown, and the distal portion is much reduced.

The mesiolingual cusp is the highest and sharpest, although the mesiobuccal is overall largest as

viewed from the occlusal. It is followed in size by the ML, DB, and DL cusps.

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71.The vitamin that can be synthesized by microorganisms only:

1. Cobalamine.2. Folic acid.

3. Niacin. 4. None.

ANS. 1

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70. ANB angle of 2? indicates:

A. A favorable relationship of maxillary alveolar base to Mandibular alveolar base
B. A favorable relationship of mandible to cranium.
C. Poor cranial growth
D. Upright incisors

Ans A

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