The Journal of Adhesive Dentistry
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J Adhes Dent 15 (2013), No. 5     15. Oct. 2013
J Adhes Dent 15 (2013), No. 5  (15.10.2013)

Page 467-472, doi:10.3290/j.jad.a29584, PubMed:23593637


Zirconia-Porcelain Bonding: Effect of Multiple Firings on Microtensile Bond Strength
Trindade, Flávia Z. / Amaral, Marina / Melo, Renata M. / Bottino, Marco A. / Valandro, Luiz Felipe
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 (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 (α = 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.

Keywords: all-ceramic, zirconia, layering veneer, microtensile bond strength
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