DANB - General Chairside Assisting Dental Impression Materials Questions and Answers

Question 1

A dental assistant is preparing to take a preliminary impression for diagnostic models.
Which of the following materials is most commonly used for this purpose due to its ease of use and cost-effectiveness?

Accepted Answer

Alginate hydrocolloid

Answer

Polyvinyl siloxane (PVS)

Answer

Polyether

Answer

Impression compound

Question 2

A patient has a strong gag reflex, and the dentist has requested a preliminary maxillary impression. To make the procedure more comfortable for the patient, the dental assistant should:

Accepted Answer

Use a fast-set alginate and seat the tray from anterior to posterior.

Answer

Select a tray that is one size larger than needed to capture more detail.

Answer

Mix the alginate with cold water to delay the setting time.

Answer

Have the patient tilt their head backward during tray placement.

Question 3

Which elastomeric impression material is known for its superior hydrophilicity (ability to perform well in moist conditions) and rigidity, making it a good choice for detailed impressions of crown preparations, even with slight moisture?

Accepted Answer

Polyether

Answer

Condensation silicone

Answer

Polysulfide

Answer

Polyvinyl siloxane (PVS)

Question 4

After taking an alginate impression, the dental assistant should immediately rinse it under cool running water and then disinfect it. What is the primary reason for wrapping the disinfected impression in a damp paper towel and placing it in a sealed bag before pouring?

Accepted Answer

To prevent distortion from syneresis or imbibition.

Answer

To allow the material to fully polymerize.

Answer

To remove any residual disinfectant from the surface.

Answer

To make the impression easier to separate from the stone model.

Question 5

A dentist is using a polyvinyl siloxane (PVS) material for a final impression. The dental assistant notices that the material is taking much longer than usual to set. The use of which of the following items by the operator could have caused this setting inhibition?

Accepted Answer

Latex gloves

Answer

Cotton rolls

Answer

Retraction cord with aluminum chloride

Answer

Nitrile gloves

Question 6

When taking a final impression using a heavy body and light body system, what is the primary purpose of the light body material?

Accepted Answer

To flow into and capture the fine details of the preparation.

Answer

To fill the bulk of the impression tray.

Answer

To provide rigidity and support to the impression.

Answer

To adhere the heavy body material to the tray.