title: Effect of temperature and ageing on the mechanical properties of dental polymeric composite materials.
abstract: Evaluation of the mechanical properties of some dental composite materials, Compact, Finesse and Prisma-Fil based on bisphenol glycidyl methacrylate resin was undertaken by applying compression, tension and hardness tests. The effects of temperature and ageing times on these properties were studied. There was a marked increase in the mechanical properties (compressive strength, diametral tensile strength, compressive elastic modulus and hardness) for all the investigated composites with increase of both temperature and time. This was explained in terms of the influence of temperature on the polymerization rate of the materials. The improvement in the mechanical properties of the samples, kept at 37 degrees C, was attributed to further and continued polymerization of the polymer content of their resin system. Such mechanical improvement was verified by the regression equation of linearity versus both temperature and time.
authors.affiliation: Department of Materials Science, Alexandria University, Egypt.
authors.forename: S H
authors.initials: SH
authors.lastname: Kandil
authors.forename: A A
authors.initials: AA
authors.lastname: Kamar
authors.forename: S A
authors.initials: SA
authors.lastname: Shaaban
authors.forename: N M
authors.initials: NM
authors.lastname: Taymour
authors.forename: S E
authors.initials: SE
authors.lastname: Morsi
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003188:Composite Resins; D003764:Dental Materials; D004548:Elasticity; D006244:Hardness; D008422:Materials Testing; D010316:Particle Size; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D003188:Composite Resins; D003764:Dental Materials