TCDHA Dental Materials Test 3

TCDHA Dental Materials Test 3 Self-curing is a process whereby a chemical reaction occurs when 2 resins, a base with chemical activators and a catalyst, are mixed together? - True Moisture contamination contributes to ineffective bonding? - True Enamel bonding is stronger than dentin bonding? - True Composite resins light cured in large increments can contribute to hypersensitivity? - True The primer is applied following the bonding resin? - False, it happens before The smear layer is composed of cut tooth debris, bacterial plaque, and bodily which interferes with the formation of bond to the pulp? - False What is the name of the acid commonly used to etch tooth structure? - phosphoric acid How is bonding to enamel achieved? - requires only a low viscosity liquid resin monomer that will penetrate into the spaces on and between enamel rods created by acid etching What causes dentin sensitivity? - over etched dentin How is dentin bonding best achieved? - Adhesion occurs by removal of smear layer and formation of micro tags within intertubular dentin glazing phase? - (baking) 2nd step, completed after final contouring of crown. sintering phase? - (contouring) 1st step, heat ceramic particles to melting poing then fuse to adjacent particles at boarders. As a dental hygienist how would you describe a veneer to your client? - Thin layers of esthetic materials that are bonded to the anterior portion of the mouth. Ceramics appear similar to natural teeth because they are fluorescent? - False Ceramics appear opalescent, that is, they emit light in the visible wave spectrum when ultraviolet light hits them? - False The more aesthetic the ceramic is, the more polycrystalline particles are found in it? - False, its glass particles Computer-Assisted Machining does not require dies or temporary crowns allowing the dentist to prepare and deliver the restoration in the same process? - True Ultrasonic scalers can chip and craze margins of esthetic materials - True Acidulated fluorophosphate (APF) can be used on porcelain surfaces - False Ceramic materials with a more opaque core such as Procera Zirconia can be used to hide discolorations from root canal therapy or tetracycline stains? - True A pastel yellow has more chroma than a bold yellow? - False For best shade matching, the teeth