Zirconia-Porcelain Bonding: Effect of Multiple Firings on Microtensile Bond Strength

Autor(es)

Trindade, Flavia Z. ^[1] ; Amaral, Marina ^[2] ; Melo, Renata M. ^[3] ; Bottino, Marco A. ^[4] ; Valandro, Luiz Felipe ^[5]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ. Dept Dent Mat & Prosthodont

^[2] Sao Paulo State Univ. Dept Dent Mat & Prosthodont

^[3] Sao Paulo State Univ. Dept Dent Mat & Prosthodont

^[4] Sao Paulo State Univ. Dept Dent Mat & Prosthodont

^[5] Univ Fed Santa Maria. Dept Restorat Dent Prosthodont

• Tipo de documento: Artigo Científico
• Fonte: Journal of Adhesive Dentistry; v. 15, n. 5, p. 467-472, 2013.
• Citações Web of Science: 6

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. (AU)

• Processo FAPESP: 10/50879-0 - Influência do modo de aplicação e do número de queimas de cerâmicas feldspáticas no comportamento mecânico de espécimes cerâmicos bilaminados
• Beneficiário: Marco Antonio Bottino
• Modalidade de apoio: Auxílio à Pesquisa - Regular