AGD Dental Materials and Biomaterials 4

Question 1

Which property of an ideal implant biomaterial is described as the ability to integrate with surrounding bone without fibrous encapsulation?

Accepted Answer

Osseointegration

Answer

Osseointegration, defined by Brånemark, describes the direct structural and functional connection between living bone and the implant surface without intervening soft tissue.

Question 2

Surface roughness of titanium implants is most commonly increased by which process to enhance osseointegration?

Accepted Answer

Sandblasting and acid etching (SLA)

Answer

Sandblasted, large-grit, acid-etched (SLA) surfaces increase microroughness significantly, improving bone-to-implant contact and osseointegration speed.

Question 3

Which endodontic sealer component is responsible for the antimicrobial activity of zinc oxide eugenol sealers?

Accepted Answer

Eugenol

Answer

Eugenol is the primary antimicrobial agent in ZOE sealers, inhibiting bacterial growth through disruption of lipid membranes.

Question 4

The fatigue failure of a metal restoration is best described as failure due to:

Accepted Answer

Repeated cyclic stresses below the proportional limit

Answer

Fatigue failure occurs from repeated cyclic loading at stresses well below the material's ultimate strength, eventually causing crack initiation and propagation.

Question 5

Which ion released from glass ionomer cement is primarily responsible for its cariostatic properties?

Accepted Answer

Fluoride

Answer

Fluoride ions released from glass ionomer cement inhibit bacterial metabolism and promote remineralization of adjacent tooth structure.

(AGD) Academy of General Dentistry Certification Practice Test

(AGD) Academy of General Dentistry Certification Practice Test

AGD Dental Materials and Biomaterials 4