title: Improving the compatibility of an Y-TZP/porcelain system using a new composite interlayer composition.
abstract: The aim of this study was to evaluate the effects of different cooling procedures and a new composite interlayer composition on the flexural strength, and veneer delamination resistance, of an all-ceramic veneered translucent Y-TZP core. One hundred twenty bar-shaped specimens of a translucent Y-TZP ceramic were prepared and divided into three groups: (1) no composite interlayer; (2) a glass interlayer (silica-based glass); (3) a mixed composite interlayer of glass and porcelain veneer material. A veneering porcelain (with and without a composite interlayer) was applied on the specimen surface and sintered. Each core-veneer group was cooled using a rapid or a slow cooling rate. All specimens were tested in four-point bending. Data were statistically analyzed using two-way ANOVA, followed by Post-Hoc tests with Bonferroni correction (α=0.05) and Weibull analysis. The group with no interlayer using the rapid cooling technique exhibited the highest flexural strength. However, with low reliability and the greatest delaminated area of porcelain under tension. A glass interlayer between porcelain veneer and zirconia core presents as a good alternative for maintaining flexural strength and porcelain veneer delamination resistance in zirconia based restorations.
authors.affiliation: School of Dentistry, University of Alberta, Edmonton, Alberta, Canada. Electronic address: passos@ualberta.ca.
authors.forename: Sheila P
authors.initials: SP
authors.lastname: Passos
authors.affiliation: School of Dentistry, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: Bernie
authors.initials: B
authors.lastname: Linke
authors.affiliation: School of Dentistry, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: Paul W
authors.initials: PW
authors.lastname: Major
authors.affiliation: School of Dentistry, University of Alberta, Edmonton, Alberta, Canada; Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: John A
authors.initials: JA
authors.lastname: Nychka
mesh_terms: D002516:Ceramics; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D003801:Dental Veneers; D005898:Glass; D008422:Materials Testing; D015203:Reproducibility of Results; D013314:Stress, Mechanical; D013499:Surface Properties; D015019:Yttrium / Q000032:analysis*; D015040:Zirconium / Q000032:analysis*
chemical_list: D003776:Dental Porcelain; D015019:Yttrium; D015040:Zirconium
keywords: All-ceramics; Cooling rate; Delamination; Flexural strength; Y-TZP