448.After doing proper etching ,what is the ideal depth of the microtags formed

a.0.5-5um
b.5-50um
c.50-500um
d.500-5000um


Ans-5-50um

382.Which of the following partially or completely disappears visually when the enamel is hydrated

a.Incipient caries
b.Hypocalcified enamel
c.Tetracycline stains
d.Flouride stains
Ans-a.Incipient caries

326.Sprue gauge for inlay is

a.8-12
b.10-12
c.12-14
d.6-8
Ans-8-12

219.The total pore volume of dark zone is

a.2-4%
b.20-40%
c.5-10%
d.0.1-1%


Ans:a.2-4%


Expalanation:Ref sturdevant 4th ed /pg 95

218.The appearance of streptococcus mutans in pit and fissure caries is usually followed by caries

a.6 to 10 months later
b.2 to 6 months later
c.within 2 months
d.6 to 24 months later


Ans.d.6 to 24 months later


Explanation:Ref sturdevant 4 th ed/pg 83

217.Peak rates for the incidence of new carious lesions occurs how many years after eruption of the teeth

a.1 year
b.2 years
c.3 years
d.At the time of eruption

Ans:c.3 years


Explanation:Ref sturdevant 4th ed/pg 92

216.The minimum depth of a detectable carious lesion on a radiograph is

a.500 micrometer
b.1000 micrometer
c.5000 micrometer
d.8000 micrometer

Ans:a.500 micrometer

Explanation:Ref sturdevant 4th ed pg102

60.The cavo surface angle for inlay cavity preparation :

a. 90 degree b. 150 degree
c.<90 d. 180

Ans. B

The angle at the junction of the walls of the cavity preparation and the external surface of the tooth.

It is of two types

[Ref Sturdevant 4th ed. Pg 300]

Butt joint

Lap / Slip joint

90o cavosurface angle

Advocated in amalgam restorations because amalgam is a brittle material and has low edge strength

Butt joint produces maximal strength for both tooth and amalgam.

It is also advocated in silicate and porcelain restorations

> 90 degree cavosurface angle.

Advocated in cast and composite restorations

30 – 40o marginal metal and 140 – 150o cavosurface angle.

Beveling enables superior adaptation and burnishability of marginal metal

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9.

9. Difference between physical characteristics of a file & reamer is:
A. The cross-section of reamers is square and files are triangular in cross section.
B. The numbers of flutes on the blade are more in files than in reamers.
C. The reamers have more flutes in the blade.
D. Files have two superficial grooves to produce flutes in a double helix design.
--------------------------------------------------------------------------------------------------------
9. Answer is: B- The numbers of flutes on the blade are more in files than in reamers.
(Ref. Grossman 11th Ed/ 195) Repeat AIIMS-MAY-06.

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7.

7.Pin used in pin retained restoration of an endodontically treated tooth is:
A. Cemented.
B. Friction locked.
C. Self threaded.
D. Any of the above.
-----------------------------------------------------------------------------------------
7. Answer is: A- Cemented pin
(Ref: Sturdevant- 2nd Ed. / Page. 373.)

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