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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59.Tuberculosis is immunologically mediated disorder of

a. Autotoxic type b. Immune complex disease
c. Delayed hypersensitivity d. Anaphylactic type

Ans: C. Delayed hypersensitivity: A non-immunized person by a tuberculin skin test, which yields a delayed hypersensitivity type response to purified protein derivatives of M. tuberculosis. Those immunized for TB or with past-cleared infection will respond with delayed hypersensitivity parallel to those currently in a state of infection and thus the test must be used with caution, particularly with regard to persons from countries where TB immunization is common.

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58.Which of the following structures is lined with epithelium derived from mesoderm of the ureteric bud?

A. Bowman's capsule b. Distal convoluted tubule

C. Loop of Henle D. Ureter

ANS. D. The transitional epithelium that lines the ureter, the renal pelvis, and the major and minor calyces is derived from mesoderm of the ureteric bud, as is the cuboidal epithelium of the collecting tubules. The simple squamous epithelium lining Bowman's capsule (choice A) is derived from mesoderm of the metanephric vesicle. The simple cuboidal epithelium lining the distal convoluted tubule (choice B) is derived from mesoderm of the metanephric vesicle. The simple squamous epithelium lining the loop of Henle (choice C) is derived from mesoderm of the metanephric vesicle.

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