title: Fracture strength of all-ceramic crowns.
abstract: The fracture strengths of four types of all-ceramic premolar crowns (conventional Vita-Dur, In-Ceram, Dicor, and IPS-Empress) were compared after a preload cycling in aqueous atmosphere. Preload cycling significantly decreased the strength of Vita-Dur crowns. Fracture strength of Vita-Dur crowns was improved when they were luted with either polyalkenoate or adhesive resin cement. The average (standard deviation) of load to fracture of ceramic crowns luted using zinc phosphate cement and after applied preload cycling in distilled water were: Vita Dur, 770 (237) N; Vita In-Ceram, 1060 (341) N; Dicor, 840 (226) N; and IPS-Empress: 891 (185) N. The In-Ceram crowns fractured in two modes: complete fractures at 1276 (207) N; and fractures with the core remaining intact at 808 (292) N.
authors.affiliation: Department of Dental Materials Science, Tokyo Dental College, Chiba, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yoshinari
authors.forename: T
authors.initials: T
authors.lastname: Dérand
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D000538:Aluminum Silicates; D000818:Animals; D002417:Cattle; D003442:Crowns; D003738:Dental Cements; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D006244:Hardness; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D012117:Resins, Synthetic; D015036:Zinc Phosphate Cement
chemical_list: D000538:Aluminum Silicates; D003738:Dental Cements; C047475:Dicor ceramic; C075815:IPS-Empress ceramic; D012117:Resins, Synthetic; D003776:Dental Porcelain; C070870:In-Ceram; C058236:Vitadur N; D015036:Zinc Phosphate Cement; D000537:Aluminum Oxide