OPER 8120 Lecture Notes - Lecture 22: Photocure, Radiant Exposure, Ionomer
12 Apr 2020
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Introduction to enamel and dentin bonding: visible light polymerization, pit and fissures caries management, glass ionomer, non-carious lesions: non-cavitates and cavitated, dental composite composition, readings: craig"s chapter 9 136-155, summitt"s chapters 10 and 11, class v. Broad but inefficient wavelength of light 370 and 550 nm. Polywaves with multiple led chip types (>1,000 mw) Photocuring in dentistry activate the free radicals by electromagnetic energy contained in light photons with photoinitiators. Beam irradiance homogeneity (irradiance distribution) aka "top hat factor" Irradiance decreases from the light tip to the surface material with increasing distance. Note: spectral emission from light curing unite should be matched with spectral absorption of photocurable material. Over-curing resin has no damage to the composite. Avoid tissues & place gauze over oral mucosa. Body, enamel, and translucent shades in 2 mm increments = 8 j to cure. Dentin and a6 and b5 body shades in 1. 5 mm increments = 16 j to cure.
