Dental Materials & Equipment Maintenance Flashcards

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

Answer: Hybrid composite

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

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

Answer: Create a micromechanical bond between composite and tooth structure

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

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

Answer: Putty-like consistency

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

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

Answer: Pseudomonas aeruginosa

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

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

Answer: <200 CFU/mL

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.

Which type of impression material is considered irreversible hydrocolloid?

Answer: Alginate

Alginate is an irreversible hydrocolloid because its gelation is a chemical reaction that cannot be reversed by temperature changes.

When should the curing light tip be cleaned during a clinical day?

Answer: Between each patient

Curing light tips must be disinfected or sterilized between patients to prevent cross-contamination.