title: Photopolymerized resins: surface hardness variation in relation to time of polymerization and setting.
abstract: The authors studied the superficial hardness of composite resins cured for two different times: 20 and 40 seconds of light exposure. The hardness values were read immediately and 24 hours after polymerization. A significant increase in hardness was observed with 40 s exposure as compared to 20 s. Hardness values were significantly higher at 24 h than immediately after polymerization.
authors.affiliation: Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo, Brazil.
authors.forename: M L
authors.initials: ML
authors.lastname: Turbino
authors.forename: D
authors.initials: D
authors.lastname: Vinha
authors.forename: A L
authors.initials: AL
authors.lastname: Centola
authors.forename: G M
authors.initials: GM
authors.lastname: Campos
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins / Q000737:chemistry*; D006244:Hardness; D008027:Light; D008422:Materials Testing; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D019279:Resin Cements; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003188:Composite Resins; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D019279:Resin Cements; C065770:Herculite XR; C074741:Silux Plus; C036885:prisma-fil; C048711:P-30 composite resin; D017438:Bisphenol A-Glycidyl Methacrylate; C039734:Durafill; C047484:heliosit; C059919:Estilux posterior; C046503:formula F 70