Dental MaterialsThe dental amalgam alloys and mercury are mixed in a ratio of:

a. 1:2

b. 1:1

c. 1.3

d. 2:1

Most common drawback of amalgam restoration is:

a. Secondary expansion.

b. Porosity.

c. Marginal break-downd.

d. contraction on setting.

Which part of the amalgam restoration has the highest mercury concentration?:

a. Marginal area.

b. Center of restoration.

c. Proximal surface of restoration.

d. Inclined planes.

Fillers are added to composite resin to:

a. Increase working time.

b. Increase co-efficient of thermal expansion.

c. Inhibit matrix deformation.

d. B + C

The main resin constituent of polishable composite resin is:

a: Polymethylmethacrylate.

b. Polycarbonate.

c. Dimethacrylate.

d. Urethane.