Medical MCQs

5099 MCQs  (Page 68 of 510)

Quartz in investment material is added for_______________?
A. Strength
B. Expansion components for casting shrinkage
C. Decrease strength
D. Contraction
Inlay wax is used to_______________?
A. Temporarily cement inlays:
B. Make inlay wax patterns
C. Invest inlay patterns
D. Box models
18-B Stainless steel orthodontic wire has_______________?
A. 18% nickel 8% chrominum
B. 18% chromium 8% nickel
C. 18% chromium 8% cobalt
D. 18% carbon 8% iron
Disadvantage of having a short sprue is________________?
A. Rapid solidification of metal
B. No place for reservoirs
C. Incomplete evacuation of gases
D. Difficulty in removing casting from investment
The main ingredient of inlay wax is__________________?
A. Candellila wax
B. Paraffin wax
C. Carnauba wax
D. Gum dammar
Casting flux is used to_______________?
A. Prevent the oxidation of the metal during melting
B. Increase the melting point of the flux
C. Flaring the point of the sprue attachment
D. None of the above
Gases dissolved in molten metals are liberated when cooled giving rise to________________?
A. Suckback porosity
B. Gas inclusion porosity
C. Localized shrinkage porosity
D. Microporosity