J Adv Prosthodont.  2011 Sep;3(3):119-125. 10.4047/jap.2011.3.3.119.

Influence of cement thickness on resin-zirconia microtensile bond strength

Affiliations
  • 1Department of Prothodontics, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea. sunjai@yuhs.ac
  • 2Department of Dental Biomaterials Science, Graduate School, Seoul National University, Seoul, Korea.
  • 3Department of Prosthodontics, Yonsei University Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea.

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 AND METHODS
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<.001). Differences in cement thickness did not influence the resin-zirconia microtensile bond strength given the same resin cement or storage conditions (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.

Keyword

Zirconia; Resin cement; Microtensile bond strength; Cement thickness

MeSH Terms

Adhesives
Ceramics
Dentin
Molar
Resin Cements
Water
Zirconium
Adhesives
Ceramics
Resin Cements
Water
Zirconium

Figure

  • Fig. 1 Schematic image of customized jig for zirconia-resin-tooth bonding. Two lateral fixation screws stabilized Tofflemire matrix bands. A vertical fixation screw immobilized the cut tooth specimen and maintained constant torque during polymerization of the resin cement.

  • Fig. 2 Preparation of microbeams. A customized holding device was used to rotate the specimen 90 degrees, resulting in microbeams with a rectangular cut surface.

  • Fig. 3 Measurement of cement thickness. Microbeams with cement thicknesses of 40 (A) and 160 µm (B).

  • Fig. 4 SEM images of fractured non-thermocycled microbeams. The fractured surface reflects the mixed failure mode at the resin-zirconia interface (A: U40NTC; B: P160NTC).

  • Fig. 5 SEM images of fractured microbeams which were thermally cycled 18,000 times. Both fractured surfaces represent adhesive failures at the resin-zirconia interface (A: U40TC, B: P40TC).


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