Free EFDA Dental Materials & Chairside Assisting Skills Questions and Answers

Question 1

Which dental material is commonly used for temporary fillings?

Accepted Answer

Zinc oxide-eugenol (ZOE).

Answer

Zinc oxide-eugenol (ZOE) is a commonly used dental material for temporary fillings due to its sedative effect on the pulp and good sealing properties. It is easily placed and removed, making it ideal for short-term restorations or as a base under other restorative materials. Its palliative qualities help soothe an irritated pulp.

Question 2

What is the primary function of a dental liner in a cavity preparation?

Accepted Answer

To act as a protective barrier for the pulp.

Answer

A dental liner is applied in a thin layer to the deepest portion of a cavity preparation, primarily to act as a protective barrier for the pulp. It helps to protect the pulp from chemical irritation from restorative materials, thermal changes, and bacterial invasion. This promotes pulp vitality and reduces postoperative sensitivity, contributing to the longevity of the restoration.

Question 3

Which instrument is used to carry and condense amalgam into a cavity preparation?

Accepted Answer

Amalgam carrier and condenser.

Answer

The amalgam carrier is specifically designed to pick up and transfer freshly mixed amalgam from the amalgam well to the cavity preparation. Once the amalgam is in the cavity, a condenser is then used to pack and condense the amalgam firmly into the preparation. This ensures proper adaptation, eliminates voids, and achieves optimal density for a strong, durable restoration.

Question 4

What is the purpose of etching a tooth surface before applying composite resin?

Accepted Answer

To improve adhesion of the resin material.

Answer

Etching the tooth surface with an acid (typically phosphoric acid) before applying composite resin creates microscopic porosities and roughens the enamel and dentin. This process significantly increases the surface area and mechanical retention, allowing the composite resin to bond more effectively to the tooth structure. This ensures a strong, durable, and long-lasting restoration.

Question 5

Which dental cement is often used for permanent cementation of crowns and bridges?

Accepted Answer

Glass ionomer.

Answer

Glass ionomer cement is frequently used for the permanent cementation of crowns and bridges due to its excellent biocompatibility, fluoride-releasing properties, and good adhesion to tooth structure and various restorative materials. It provides a strong, durable bond and helps prevent recurrent decay, making it a preferred choice for long-term restorations in dentistry.

EFDA - Expanded Function Dental Assistant Certification Practice Test

EFDA - Expanded Function Dental Assistant Certification Practice Test

Free EFDA Dental Materials & Chairside Assisting Skills Questions and Answers