Zirconia-Porcelain Bonding: Effect of Multiple Firings on Microtensile Bond Strength
Carregando...
Fonte externa
Fonte externa
Data
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Quintessence Publishing Co Inc
Tipo
Artigo
Direito de acesso
Acesso restrito
Fonte externa
Fonte externa
Resumo
Purpose: To determine the bond strength between zirconia and porcelain with varying numbers of veneer firing cycles.Materials and Methods: Fifty specimens of zirconia veneered with feldspathic ceramic were submitted to one (1-firing), two (2-firings), three (3-firings), four (4-firings), or five (5-firings) firing cycles to sinter the porcelain. After the respective number of firings, the specimens were embedded into acrylic resin and sectioned into bars with a 1-mm(2) cross-sectional area. The microbars were bonded to a special device and attached to a universal testing machine (Emic DL 1000). Microtensile bond strength testing (MTBS) was performed at 0.5 mm/min. The maximum load for fracture was recorded (N) and the microtensile bond strength was calculated in MPa. Data were analyzed using one-way ANOVA and Tukey's test (alpha = 0.05). The Weibull modulus and characteristic strength was also calculated for each experimental group.Results: Specimens submitted to a single firing cycle presented the lowest bond strength values (14.1 MPa), two firing cycles provided intermediate bond strength values (15 MPa) and the other groups presented equivalently high values (18.1 - 18.4 MPa). The Weibull modulus did not change between the groups.Conclusion: More than three firing cycles of a veneer ceramic provided higher bond strengths between zirconia and the veneering ceramic.
Descrição
Palavras-chave
all-ceramic, zirconia, layering veneer, microtensile bond strength
Idioma
Inglês
Citação
Journal Of Adhesive Dentistry. Hanover Park: Quintessence Publishing Co Inc, v. 15, n. 5, p. 467-472, 2013.
