EFDA Dental Materials & Equipment Maintenance 2

Question 1

Which type of composite resin is best suited for high-stress posterior restorations?

Accepted Answer

Hybrid composite

Answer

Hybrid composites contain both macrofillers and microfillers, providing the strength needed for posterior load-bearing restorations.

Question 2

What is the primary purpose of a dentin bonding agent in composite restorations?

Accepted Answer

Create a micromechanical bond between composite and tooth structure

Answer

Dentin bonding agents infiltrate demineralized dentin to form a hybrid layer that creates micromechanical retention for composite resin.

Question 3

When mixing zinc oxide eugenol (ZOE) cement, which consistency is appropriate for a temporary restoration?

Accepted Answer

Putty-like consistency

Answer

A putty-like consistency is used for ZOE temporary restorations, allowing it to be condensed into the cavity preparation.

Question 4

Which component of a dental unit waterline biofilm poses the greatest infection control concern?

Accepted Answer

Pseudomonas aeruginosa

Answer

Pseudomonas aeruginosa is a commonly isolated opportunistic pathogen from dental unit waterlines and is an infection control concern especially for immunocompromised patients.

Question 5

What is the recommended water quality standard for dental unit waterlines according to the CDC?

Accepted Answer

<200 CFU/mL

Answer

The CDC recommends that dental unit waterline output water contain no more than 500 CFU/mL of heterotrophic water bacteria, consistent with drinking water standards.

(EFDA) Expanded Function Dental Auxiliary Practice Test

(EFDA) Expanded Function Dental Auxiliary Practice Test

EFDA Dental Materials & Equipment Maintenance 2