title: Fracture load and failure analysis of zirconia single crowns veneered with pressed and layered ceramics after chewing simulation.
abstract: This study determined the fracture load of zirconia crowns veneered with four overpressed and four layered ceramics after chewing simulation. The veneered zirconia crowns were cemented and subjected to chewing cycling. Subsequently, the specimens were loaded at an angle of 45° in a Universal Testing Machine to determine the fracture load. One-way ANOVA, followed by a post-hoc Scheffé test, t-test and Weibull statistic were performed. Overpressed crowns showed significantly lower fracture load (543-577 N) compared to layered ones (805-1067 N). No statistical difference was found between the fracture loads within the overpressed group. Within the layered groups, LV (1067 N) presented significantly higher results compared to LC (805 N). The mean values of all other groups were not significantly different. Single zirconia crowns veneered with overpressed ceramics exhibited lower fracture load than those of the layered ones after chewing simulation.
authors.affiliation: Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, Zurich, Switzerland. bogna.stawarczyk@zzm.uzh.ch
authors.forename: Bogna
authors.initials: B
authors.lastname: Stawarczyk
authors.forename: Mutlu
authors.initials: M
authors.lastname: Ozcan
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Roos
authors.forename: Albert
authors.initials: A
authors.lastname: Trottmann
authors.forename: Christoph H F
authors.initials: CH
authors.lastname: Hämmerle
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D001732:Bite Force; D002484:Cementation / Q000379:methods; D003442:Crowns; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation; D003801:Dental Veneers; D055119:Elastic Modulus; D006358:Hot Temperature; D006801:Humans; D008409:Mastication / Q000502:physiology*; D008422:Materials Testing; D018583:Pliability; D017680:Potassium Compounds / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; D003764:Dental Materials; D017680:Potassium Compounds; D003776:Dental Porcelain; C016447:feldspar; D015040:Zirconium; C028541:zirconium oxide