title: Shear bond strength between metal alloy and a ceramic system, submitted to different thermocycling immersion times.
abstract: The aim of this study was to evaluate the shear bond strength of Co-Cr and Ni-Cr metal alloys and a specific ceramic, submitted to different thermocycling immersion times. Sixty metal-ceramic specimens were confectioned and standardized in cylindricalformat. Three thermocycling conditions were evaluated: without thermocycling, 3,000 cycles (5 degrees C/55 degrees C+/-1) with 30s of immersion time and 3,000 cycles (5 degrees C/55 degrees C+/-1) with 60s. The shear bond strength was performed in a universal testing machine, using a special device to concentrate the tension at the metal/ceramic interface during the test. The load was applied until fracture of the specimens. The data was statistically analyzed by ANOVA (two-way) and Tukey (p<0.05) test. The results didn't show significant statistic differences between the metal-porcelain combinations. Nevertheless, both metal-ceramic systems submitted to 60s of immersion time showed lower values compared to specimens without thermocycling. It was concluded that the thermocycling immersion time of 1 minute affect the shear bond strength values for the Ni-Cr/porcelain and Cr-Co/porcelain systems.
authors.affiliation: Department of Dental Materials and Prostheses, Paulista State University, São José dos Campos, Brazil. susana_works@yahoo.com.br
authors.forename: Susana M
authors.initials: SM
authors.lastname: Salazar M
authors.forename: Sarina M B
authors.initials: SM
authors.lastname: Pereira
authors.forename: Vanessa Z
authors.initials: VZ
authors.lastname: Ccahuana V
authors.forename: Sheila P
authors.initials: SP
authors.lastname: Passos
authors.forename: Aleska D
authors.initials: AD
authors.lastname: Vanderlei
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Pavanelli
authors.forename: Marco A
authors.initials: MA
authors.lastname: Bottino
mesh_terms: D002858:Chromium Alloys / Q000737:chemistry*; D001840:Dental Bonding; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D033081:Shear Strength; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors
chemical_list: D002858:Chromium Alloys; D016876:Metal Ceramic Alloys; D003776:Dental Porcelain