title: Post-irradiation polymerization of different anterior and posterior visible light-activated resin composites.
abstract: The Knoop hardness number was measured for bottom and top surfaces of 2 mm thick specimens of different anterior and posterior visible light-cured composites. The variables for this study included various exposure times and a series of time intervals from immediately after curing up to 72 h. Post-irradiation microhardness at the bottom and top surfaces increased rapidly over the first hour, was slower during 24 h and showed no further increase after 24 h. Increasing exposure time resulted in higher microhardness values at both surfaces. Magnitudes of change were larger for the bottom surface. Exposure times longer than those recommended by the manufacturers were needed, especially for the anterior microfilled composites, to achieve adequately photo-activated resin that had an optimum bottom/top surface microhardness of 80-90%. Maximum hardness values were found to be dependent on the volumetric fraction but not on the average inorganic filler size. The post-irradiation increase in hardness value was independent of composite parameters and is probably commensurate with polymerization kinetics.
authors.affiliation: Department of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Israel.
authors.forename: R
authors.initials: R
authors.lastname: Pilo
authors.forename: H S
authors.initials: HS
authors.lastname: Cardash
mesh_terms: D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins / Q000737:chemistry*; D006244:Hardness; D006245:Hardness Tests; D008027:Light; D008422:Materials Testing; D010316:Particle Size; D011791:Quartz / Q000737:chemistry; D012044:Regression Analysis; D019279:Resin Cements; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003188:Composite Resins; D019279:Resin Cements; C065771:P50 composite resin; C067319:valux; C074741:Silux Plus; C067786:Visio-Molar; D011791:Quartz; D017438:Bisphenol A-Glycidyl Methacrylate; C044373:visiodispers; C069717:Viso-Fil