1) Which of the following characteristics of inlay wax is its major disadvantage ?
a) flow.
b) rigidity.
c) hardness.
d) high thermal expansion.
2) When porcelain is baked against metal, it should possess a
a) high fusion expansion.
b) high fusion temperature.
c) linear coefficient of thermal expansion less than, but close to,that of the metal.
d) linear coefficient of thermal expansion greater than but close to that of metal.
3) As the gold content of a dental solder decreases,the
a) hardness decreases.
b) ductility increases.
c) corrosion resistance decreases.
d) ultimate tensile strength decreases.
4) Reversible hydrocolloids exhibit the property of transformation from sol to gel and gel to sol as a function of the
a) concentration of the fillers and plasticizers.
b) percentage of composition by weight of water.
c) concentration of potassium sulfate.
d) temperature.
5) An anterior fixed partial denture is contraindicated when
a) abutment teeth are noncarious.
b) an abutment tooth is inclined 15 degree but is otherwise sound.
c) there is considerable resorption of the residual ridge.
d) crowns of the abutment teeth are extremely long owing to gingival recession.
