Dental Materials & Equipment Maintenance Flashcards
7 cards from real EFDA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Dental Materials & Equipment Maintenance flashcards as text
Which dental material is most susceptible to moisture contamination during placement?
Answer: Composite resin with total-etch technique
Composite resin placed with total-etch technique requires a dry field because moisture contamination disrupts the bonding agent and weakens adhesion.
What is the purpose of silane coupling agent when bonding to ceramic restorations?
Answer: Create a chemical and micromechanical bond between ceramic and resin cement
Silane creates a chemical bond between the inorganic ceramic surface and the organic resin cement by acting as a bifunctional molecule.
Which handpiece maintenance step must be performed BEFORE sterilization?
Answer: Lubrication of internal bearings
Handpieces must be lubricated before sterilization so the lubricant can penetrate internal components; autoclaving without lubrication can damage bearings.
What does the term 'working time' refer to for dental cements?
Answer: The time available from mixing until insertion must be completed
Working time is the period after mixing begins during which the material remains workable and must be inserted into the prepared tooth or appliance.
Which infection control protocol applies to extracted teeth used for study or practice?
Answer: Treat as sharps and decontaminate with 10% sodium hypochlorite
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.
When mixing glass ionomer cement for luting, which ratio produces the correct consistency?
Answer: Manufacturer's specified powder-to-liquid ratio
Glass ionomer cement must be mixed at the manufacturer's specified powder-to-liquid ratio to achieve the correct viscosity, strength, and fluoride release.
What is the primary advantage of self-adhesive resin cements over conventional resin cements?
Answer: No etching or bonding agent is required prior to cementation
Self-adhesive resin cements contain acidic monomers that simultaneously etch and bond to tooth structure, eliminating the need for separate etching and priming steps.