The International journal of prosthodontics 2007-01-01

Effect of 10 years of in vitro aging on the flexural properties of fiber-reinforced resin composites.

Pekka K Vallittu

Index: Int. J. Prosthodont. 20(1) , 43-5, (2007)

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Abstract

This study determined the effect of 10 years of water immersion on the properties of fiber-reinforced resin composites (FRC). E-glass and silica fibers were used to reinforce heat-cured and autopolymerized acrylic resin polymers. Control specimens were unreinforced. Test specimens stored in water for up to 10 years were tested by the 3-point test. The flexural strength and elasticity of the specimens decreased during water immersion (P < .001, analysis of variance). After 10 years, the reductions in flexural strength and modulus of E-glass FRC were 24% and 21%, respectively; for silica FRC, reductions were 47% and 46%, respectively; and for controls, reductions were 24% and 11%, respectively. E-glass FRC showed a smaller reduction in strength than silica FRC.

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