Influence of cement thickness on resin-zirconia microtensile bond strength
The Journal of Advanced Prosthodontics
;
: 119-125, 2011.
Article
in English
| WPRIM
| ID: wpr-172527
ABSTRACT
PURPOSE:
The aim of this study was to evaluate the influence of resin cement thickness on the microtensile bond strength between zirconium-oxide ceramic and resin cement. MATERIALS ANDMETHODS:
Thirty-two freshly extracted molars were transversely sectioned at the deep dentin level and bonded to air-abraded zirconium oxide ceramic disks. The specimens were divided into 8 groups based on the experimental conditions (cement type Rely X UniCem or Panavia F 2.0, cement thickness 40 or 160 microm, storage thermocycled or not). They were cut into microbeams and stored in 37degrees C distilled water for 24 h. Microbeams of non-thermocycled specimens were submitted to a microtensile test, whereas those of thermocycled groups were thermally cycled for 18,000 times immediately before the microtensile test. Three-way ANOVA and Sheffe's post hoc tests were used for statistical analysis (alpha=95%).RESULTS:
All failures occurred at the resin-zirconia interface. Thermocycled groups showed lower microtensile bond strength than non-thermocycled groups (P.05). The number of adhesive failures increased after thermocycling in all experimental conditions. No cohesive failure was observed in any experimental group.CONCLUSION:
When resin cements of adhesive monomers are applied over air-abraded zirconia restorations, the degree of fit does not influence the resin-zirconia microtensile bond strength.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Zirconium
/
Water
/
Ceramics
/
Adhesives
/
Resin Cements
/
Dentin
/
Molar
Language:
English
Journal:
The Journal of Advanced Prosthodontics
Year:
2011
Type:
Article
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