title: Effect of 10 years of in vitro aging on the flexural properties of fiber-reinforced resin composites.
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.
authors.affiliation: Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry, University of Turku, Finland. pekka.vallittu@utu.fi
authors.forename: Pekka K
authors.initials: PK
authors.lastname: Vallittu
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D004548:Elasticity; D007101:Immersion; D008422:Materials Testing / Q000379:methods; D018583:Pliability; D013997:Time Factors; D014867:Water
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; C507521:Palapress Vario; D014867:Water; C077041:Bio acrylic resin