OPER 8120 Study Guide - Midterm Guide: Sealant, Dentin, Pumice
12 Apr 2020
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Def: amorphous layer of residual organic and inorganic debris as a result of mechanical instrumentation. *difficulty in bonding as tubules are clogged* *do not over-dry->leads to collapsed dentinal tubules* Only used for restorations involving dentin->proper "moist" bonding. *hybrid layer* is dentin demineralized by phosphoric acid. *light cure for 18 joules for optibond fl* Note: material that self-etches is able to interact with smear layer, combining etch with primer or primer + adhesive. Note. 2: self-etch is more acidic, ionic, and hydrophilic while etch-and-rinse is more effective water barrier between tooth and rbc. Preventive->used in high risk sites/patients to prevent caries. Therapeutic->treatment of early pit and fissure caries lesions (icdas 1 and 2) Minimally invasive prep with improved seal of restoratives. *fluoride-releasing material essential in treating high-caries-risk patient* Powder (fluoroaluminosilicate glass) + liquid (polyacrylic acid) Free radical initiators (trigger curing of methacrylate groups) Water-soluble resin monomers mixed with aqueous polyacrylic acid. Ions released from glass particle reacts with polyacrylic acid (hema)
