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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69.Which type of dentin is most regular in structure?

A. Primary B. Secondary
C. Reparative dentin
D. All have the same

ANS>a
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68. Internal resorption is :

a)radiolucency over unaltered canal

b) usually in a response to trauma

c) radiopacity over unaltered canal

ANS b

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67.The best way to clean the cavity before the placement of G.I.C is.

a )H2o2 b) phosphoric acid

c)poly acrylic acid

Ans. c

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