title: Fatigue failure parameters of IPS-Empress porcelain.
abstract: The purpose of this study was to determine the stress corrosion fatigue characteristics of a heat-pressed ceramic material, IPS-Empress. Disks (1 mm thick, 12 mm in diameter) were prepared, polished, and subjected to dynamic loading at multiple constant stressing rates. Fatigue tests were conducted in a circulating bath using a biaxial flexure test. The inert strength of the samples was determined in oil. The mean fracture strength for the inert tests was 135.7 MPa. Linear regression analysis of log fracture strengths vs log time to failure was performed to obtain fatigue parameters. For IPS-Empress the n value was 31 (SE 3.5) and sigma f0 was 83.3 MPa (SE 1.3 MPa).
authors.affiliation: Department of Oral Rehabilitation, School of Dentistry, Medical College of Georgia, Augusta 30912-1260, USA.
authors.forename: M L
authors.initials: ML
authors.lastname: Myers
authors.forename: J W
authors.initials: JW
authors.lastname: Ergle
authors.forename: C W
authors.initials: CW
authors.lastname: Fairhurst
authors.forename: R D
authors.initials: RD
authors.lastname: Ringle
mesh_terms: D000538:Aluminum Silicates; D003343:Corrosion; D003442:Crowns; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D016014:Linear Models; D008422:Materials Testing; D016019:Survival Analysis; D014867:Water
chemical_list: D000538:Aluminum Silicates; C075815:IPS-Empress ceramic; C087248:Jelenko porcelain; D014867:Water; D003776:Dental Porcelain; C073101:Optec; C078519:leucite