INBDE Restorative Dentistry and Dental Materials

Question 1

Which property of dental composite resins is most responsible for post-operative sensitivity?

Accepted Answer

Polymerization shrinkage creating gap formation

Answer

Thermal expansion coefficient mismatch

Answer

Lack of fluoride release

Answer

Hydrolytic degradation

Question 2

Amalgam's strength is primarily derived from which phase?

Accepted Answer

Gamma-1 phase (silver-mercury)

Answer

Gamma phase (unreacted silver-tin)

Answer

Gamma-2 phase (tin-mercury)

Answer

Delta phase (copper-tin)

Question 3

Dental porcelain is classified as a ceramic primarily because it contains:

Accepted Answer

Inorganic non-metallic crystalline or glass materials

Answer

Metal oxides only

Answer

Organic polymer matrix

Answer

Zinc phosphate cement

Question 4

The retention of a full-crown preparation is most influenced by:

Accepted Answer

Taper of the axial walls (convergence angle)

Answer

Occlusal reduction amount

Answer

Margin design (chamfer vs feather edge)

Answer

Surface roughness of the preparation

Question 5

Glass ionomer cement bonds to tooth structure primarily through:

Accepted Answer

Ionic bonding to calcium in hydroxyapatite

Answer

Micromechanical retention via etching

Answer

Van der Waals forces

Answer

Chemical bonding to collagen

Question 6

Which composite placement technique best minimizes polymerization shrinkage stress?

Accepted Answer

Oblique incremental placement

Answer

Bulk fill technique

Answer

Horizontal incremental placement

Answer

Diagonal incremental placement