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In vitro comparison of dentin bonding systems: effect of testing method and operator
Karlheinz Moll1, Andreas Fritzenschaft, Bernd Haller
1Department of Operative Dentistry and Periodontology, University of Ulm, Ulm, Germany. karlheinz.moll@medizin.uni-ulm.de
Objectives:
The purpose of this study was to investigate the influence of different in vitro tests on the ranking of four dentin bonding systems (OptiBond FL, Solid bond, OptiBond Solo, Etch&Prime 3.0) and to determine operator influence on push-out test results.
Method And Materials:
One-hundred eighty extracted human molars were used in this study. For all bonding systems, bond strengths were determined using the shear, tensile, and push-out tests. In the push-out test, two series of specimens were bonded by two operators. Additionally, margin adaptation in Class V cavities was evaluated using scanning electron microscopy and dye penetration.
Results:
Both test methods and bonding systems revealed a significant influence on bond strength. Ranking of mean bond strengths was identical in the shear and tensile tests but different in the push-out test. In addition, material ranking in the push-out test was found to be operator dependent. No correlation was observed between bond strength and margin adaptation. A weak correlation was found between the percentage of gap formation and dye penetration in Class V cavities.
Conclusion:
Comparisons of dentin bonding systems based on the results of different in vitro tests may be misleading. Operator influence on the results of push-out tests require further consideration.