Abstract
The effect of absorbed water on the tensile properties of composite resins was examined.Four different light cured composite resins(OC, PH, FU, SI)were selected and specimens for tensile test were stored in both air and deionized water at 37℃ for 24 hours, 1 week and 1 month.Tensile strength of wet specimens was lower than that of dry specimens and the difference increased as the storing time increased.OC and PH were considered to have suffered mainly physical deterioration by the water sorption because the tensile strength of these materials was recovered very well after they were dried.On the other hand FU and SI were considered to have suffered from both physical and chemical deterioration because the tensile strength of these materials did not recover well after they were dried.Absorbed water tended to make the composite resin more brittle in the tensile test.
