ADEX Dental Hygiene Dental Biomaterials Questions and Answers

Question 1

A patient has a full gold crown on tooth #30 and a porcelain-fused-to-metal (PFM) crown on tooth #19.
Which polishing agent is most appropriate for the porcelain surface to achieve a high luster without causing abrasion?

Accepted Answer

Diamond polishing paste

Answer

Coarse pumice

Answer

Tin oxide

Answer

Sodium bicarbonate

Question 2

A dental hygienist is preparing to take a preliminary impression for study models. Which of the following materials is classified as an elastic, irreversible hydrocolloid commonly used for this purpose?

Accepted Answer

Alginate

Answer

Polyvinyl siloxane (PVS)

Answer

Polyether

Answer

Impression compound

Question 3

A dentist needs to place a temporary crown and requires a luting agent that has a sedative or palliative effect on the pulp. Which of the following cements would be the most suitable choice?

Accepted Answer

Zinc oxide-eugenol (ZOE)

Answer

Resin-modified glass ionomer (RMGI)

Answer

Zinc phosphate

Answer

Glass ionomer

Question 4

A patient with a dental implant supporting a crown on tooth #8 presents for routine maintenance. To prevent damage to the implant surface, which type of instrument is contraindicated for calculus removal on the titanium abutment?

Accepted Answer

Stainless steel curette

Answer

Graphite scaler

Answer

Titanium-coated curette

Answer

Resin or plastic scaler

Question 5

When placing a direct composite restoration, the material is typically applied and cured in 2mm increments. What is the primary reason for this incremental placement technique?

Accepted Answer

To reduce the effects of polymerization shrinkage.

Answer

To improve the final shade matching of the restoration.

Answer

To increase the radiopacity of the final restoration.

Answer

To decrease the total time required for light curing.

Question 6

Which of the following dental materials is best known for its unique ability to release fluoride over time, providing a therapeutic, caries-inhibiting effect?

Accepted Answer

Glass ionomer cement

Answer

Dental amalgam

Answer

Composite resin

Answer

Ceramic porcelain

A patient has a full gold crown on tooth #30 and a porcelain-fused-to-metal (PFM) crown on tooth #19.Which polishing agent is most appropriate for the porcelain surface to achieve a high luster without causing abrasion?

A patient has a full gold crown on tooth #30 and a porcelain-fused-to-metal (PFM) crown on tooth #19.
Which polishing agent is most appropriate for the porcelain surface to achieve a high luster without causing abrasion?