title: Compressive fatigue behavior of dental restorative composites.
abstract: The purpose of this study was to investigate the compressive fatigue behavior of five dental composites. Cylindrical specimens of 8 mm length and 4 mm diameter were made according to manufacturers' recommendations and stored for two weeks in distilled water at 37 degrees C. Compressive fracture strength was measured, and subsequently fatigue tests at 10 Hz frequency were carried out in distilled water. Compressive fatigue strength was thereby obtained using the staircase method for 10(5) cycles (n = 17) under sinusoidal loading. Acquired data for compressive fracture strength were analyzed using ANOVA and Weibull statistics. Among the dental composites examined, Filtek Z250 exhibited the highest fatigue strength. This seemed to be due to the superior matrix properties coupled with a specific filler type at the highest weight%/volume% ratio. In addition, fracture mechanisms of the composites were examined.
authors.affiliation: Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran.
authors.forename: Jamshid
authors.initials: J
authors.lastname: Aghadazeh Mohandesi
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Rafiee
authors.forename: Vahid
authors.initials: V
authors.lastname: Barzegaran
authors.forename: Farhad
authors.initials: F
authors.lastname: Shafiei
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins; D019245:Compressive Strength; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D008855:Microscopy, Electron, Scanning; D044367:Phase Transition; D016019:Survival Analysis
chemical_list: D003188:Composite Resins