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Photopolymerized resins: surface hardness variation in relation to time of polymerization and setting
M L Turbino1, D Vinha, A L Centola
1Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo, Brazil.
Brazilian Dental Journal
|January 1, 1993
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.