Post graduate prosthodontic MCQ test

 

1) An abutment tooth exibiting an unfavorable survey line should
a) be restored.
b) have unfavourable contours improved.
c) be bypassed in the frame work design.
d) receive only a rest and not be clasped.

2) If there is insufficent space between the maxillary tuberosity and the retromolar pad ,it is usually best to
a) avoid covering the retromolar pad with the lower base.
b) not covering the tuberosity with the upper denture.
c) surgically reduce the occlusal aspect of the tuberosity.
d) surgically reduce the retromolar pad.

3) The principal factor in minimizing the firing shrinkage of porcelain is the
a) fusion temperature.
b) ratio of flux to feldspar.
c) uniformity of particle size.
d) thoroughness of condensation.

4) The most important mechanical property involved when a base metal partial denture clasp is adjusted is
a) hardness.
b) elongation.
c) elastic limit.
d) tensile strength.

5) In registering the vertical diamention of occlusion for the edentulous patient the physiologic rest diamention
a) equals the vertical diamention of occlusion.
b) may be exceeded if the appearence of the patient is enhanced.
c) is of little importance as it is subject to variations.
d) must always be greater than the vertical diamention of occlusion.

6)Excessive vertical diamention may result in
a) poor denture retension.
b) dropping of the corners of the mouth.
c) creases and wrinkles around the lips.
d) trauma to the underlying supporting tissues.

7) In cobalt-chromium alloys ,the consistuent responsible for corrosion resistance is
a) silver.
b) nickel.
c) cobalt.
d) chromium.

8) Heating a gypsum cast at a temperature of 110 degree centigrade for one hr will
a) drive off its excess gauging water only.
b) have minimal effect on the crushing strength.
c) weaken it because its water of crystallization is driven off.
d) strengthen it, because dry crushing strength of gypsum is more than wet crushing strength.

9) Both porcelain and acrylic resin teeth are used in prostheses .Both are secured to the base during processing .Identify the correct anchorage
a) both are chemically united with the resin base.
b) both are held to the base in a mechanical bond.
c) the anchorage of both kind of teeth is both chemical and mechanical.
d) resin teeth are chemically bonded to the base and porcelain teeth are mechanically held to the base.

10) For a more rigid structure ,a base metal partial denture alloy should be selected rather than a type IV gold because the alloy has a
a) lower elongation.
b) higher modulus of elasticity.
c) more favourable tensile strength.
d) higher hardness number.
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