FREE AGD Dental Materials and Application Questions and Answers

Question 1

A dentist is taking a final impression for a three-unit fixed partial denture.
The preparation margins are equigingival, and excellent moisture control is challenging.
The dentist requires a material with high tear strength, outstanding dimensional stability, and inherent hydrophilicity to capture fine detail in a moist environment.
Which impression material would be the most suitable choice?

Accepted Answer

Polyether

Answer

Irreversible Hydrocolloid (Alginate)

Answer

Polyvinyl Siloxane (PVS)

Answer

Impression Compound

Question 2

To achieve a durable and retentive bond to a monolithic zirconia crown, which of the following surface treatment and priming combinations is considered the gold standard?

Accepted Answer

Airborne-particle abrasion with aluminum oxide followed by the application of a 10-MDP-containing primer.

Answer

Etching with 9% hydrofluoric acid followed by the application of a silane coupling agent.

Answer

Etching with 37% phosphoric acid followed by the application of a universal bonding agent.

Answer

Steam cleaning followed by luting with a conventional glass ionomer cement.

Question 3

Which of the following components in a modern hybrid composite resin is primarily responsible for providing radiopacity, allowing the restoration to be distinguished from tooth structure and secondary caries on a radiograph?

Accepted Answer

Barium, Strontium, or Zirconium glass fillers

Answer

Bis-GMA or UDMA resin matrix

Answer

Silane coupling agent

Answer

Camphorquinone photoinitiator

Question 4

A dental assistant needs to pour diagnostic casts that will be used for patient education and the fabrication of custom whitening trays. The primary requirements are adequate surface detail, sufficient strength for handling, and cost-effectiveness. Which ADA type of gypsum product is most appropriate for this task?

Accepted Answer

Type III Dental Stone

Answer

Type IV High-Strength, Low-Expansion Die Stone

Answer

Type V High-Strength, High-Expansion Die Stone

Answer

Type II Dental Plaster

Question 5

What is the primary clinical advantage of using a Resin-Modified Glass Ionomer (RMGI) cement for luting a metal-based crown compared to a conventional glass ionomer cement?

Accepted Answer

Improved early mechanical properties and lower initial solubility.

Answer

A purely chemical bond to the non-precious metal alloy.

Answer

Significantly higher long-term fluoride release.

Answer

Superior esthetics due to a wider range of available shades.

Question 6

A dentist restores a deep, conservative Class I occlusal preparation on a mandibular molar. This type of preparation is known to have a high Configuration Factor (C-Factor). What is the most significant clinical consequence of polymerization shrinkage in this high C-Factor scenario?

Accepted Answer

High stress development at the adhesive interface, potentially leading to marginal gap formation.

Answer

A significant color shift of the composite towards a lighter, chalkier shade.

Answer

Reduced wear resistance of the occlusal surface over time.

Answer

Decreased radiopacity of the final restoration, mimicking recurrent caries.