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- Title
Zirconia-Porcelain Bonding: Effect of Multiple Firings on Microtensile Bond Strength.
- Authors
Trindade, Flavia Z.; Amaral, Marina; Melo, Renata M.; Bottino, Marco A.; Valandro, Luiz Felipe
- Abstract
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-mm2 cross-sectional area. The microbars were bonded to a special device and attached to a universal testing machine (Ernie 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 (a = 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 equivalents 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.
- Subjects
ZIRCONIUM oxide; DENTAL ceramics; TENSILE strength; DENTAL veneers; FELDSPAR; WEIBULL distribution; CROSS-sectional method; ANALYSIS of variance
- Publication
Journal of Adhesive Dentistry, 2013, Vol 15, Issue 5, p467
- ISSN
1461-5185
- Publication type
Article
- DOI
10.3290/j.jad.a29584