AGD Dental Materials & Technology 2

Question 1

Which polymerization mechanism is used in dual-cure resin cements?

Accepted Answer

Both light and chemical cure

Answer

Dual-cure resin cements combine light-activated and self-curing (chemical) polymerization to ensure adequate cure in areas light cannot penetrate.

Question 2

What is the primary advantage of zirconia over porcelain-fused-to-metal (PFM) crowns?

Accepted Answer

No metal substructure eliminating gray gingival margin

Answer

Zirconia crowns eliminate the dark metal margin visible at the gingival tissue that can occur with PFM restorations.

Question 3

Which bonding agent generation uses a separate etch, primer, and adhesive in three distinct steps?

Accepted Answer

4th generation

Answer

4th generation adhesives use a three-step process: phosphoric acid etch, primer application, and then adhesive bonding agent.

Question 4

The water-to-powder ratio of dental gypsum products directly affects which property?

Accepted Answer

Setting expansion and strength

Answer

Increasing water-to-powder ratio produces a weaker, more porous gypsum product with reduced setting expansion.

Question 5

Which impression material requires a custom tray to minimize volumetric distortion?

Accepted Answer

Zinc oxide eugenol paste

Answer

Zinc oxide eugenol impression paste flows readily and requires a custom tray to control thickness and prevent distortion.

(AGD) Academy of General Dentistry Certification Practice Test