Microtensile bond strength of a resin cement to silica-coated and silanized In-Ceram Zirconia before and after aging.
OBJECTIVE
This study compared the microtensile bond strength of resin-based cement (Panavia F) to silica-coated, silanized, glass-infiltrated high-alumina zirconia (In-Ceram Zirconia) ceramic in dry conditions and after various aging regimens.


METHODS
The specimens were placed in 1 of 4 groups: group 1: dry conditions (immediate testing without aging); group 2: water storage at 37 degrees C for 150 days; group 3: 150 days of water storage followed by thermocycling (x 12,000, 5 degrees C to 55 degres C); group 4: water storage for 300 days; group 5: water storage for 300 days followed by thermocycling.


RESULTS
Group 1 showed a significantly higher microtensile bond strength value (26.2 + 1 MPa) than the other aging regimens (6.5 +/-1, 6.2 +/-2, 4.5+/-1, 4.3+/-1 MPa for groups 2, 3, 4, and 5, respectively) (P < .01).


CONCLUSIONS
Satisfactory results were seen in dry conditions, but water storage and thermocycling resulted in significantly weaker bonds between the resin cement and the zirconia.
Valandro
Luiz Felipe
LF
Department of Dental Materials and Prosthodontics, São Paulo State University, São Jose dos Campos, Brazil.
Ozcan
Mutlu
M
Amaral
Regina
R
Leite
Fabiola Pessoa Pereira
FP
Bottino
Marco Antonio
MA
D003776:Dental Porcelain / Q000737:chemistry*; D006358:Hot Temperature / Q000009:adverse effects; D019279:Resin Cements / Q000737:chemistry*; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000009:adverse effects
C485633:In-Ceram Zirconia; C438843:Panavia-Fluoro; D019279:Resin Cements; D014867:Water; D003776:Dental Porcelain