EFDA Dental Materials & Equipment Maintenance 3

Question 1

Which dental material is most susceptible to moisture contamination during placement?

Accepted Answer

Composite resin with total-etch technique

Answer

Composite resin placed with total-etch technique requires a dry field because moisture contamination disrupts the bonding agent and weakens adhesion.

Question 2

What is the purpose of silane coupling agent when bonding to ceramic restorations?

Accepted Answer

Create a chemical and micromechanical bond between ceramic and resin cement

Answer

Silane creates a chemical bond between the inorganic ceramic surface and the organic resin cement by acting as a bifunctional molecule.

Question 3

Which handpiece maintenance step must be performed BEFORE sterilization?

Accepted Answer

Lubrication of internal bearings

Answer

Handpieces must be lubricated before sterilization so the lubricant can penetrate internal components; autoclaving without lubrication can damage bearings.

Question 4

What does the term 'working time' refer to for dental cements?

Accepted Answer

The time available from mixing until insertion must be completed

Answer

Working time is the period after mixing begins during which the material remains workable and must be inserted into the prepared tooth or appliance.

Question 5

Which infection control protocol applies to extracted teeth used for study or practice?

Accepted Answer

Treat as sharps and decontaminate with 10% sodium hypochlorite

Answer

Extracted teeth are regulated medical waste and must be treated with sodium hypochlorite or equivalent disinfectant before handling as study models, per OSHA Bloodborne Pathogens Standard.

(EFDA) Expanded Function Dental Auxiliary Practice Test

(EFDA) Expanded Function Dental Auxiliary Practice Test

EFDA Dental Materials & Equipment Maintenance 3