Related Experiment Videos
Shear and tensile bond testing for resin cement evaluation
Y Kitasako1, M F Burrow, T Nikaido
1Department of Operative Dentistry, Tokyo Medical and Dental University,Tokyo, Japan.
Summary
This study compared tensile and shear bond strengths of resin cements. Shear tests yielded higher bond strength results than tensile tests, indicating differences in bond measurement methods for dental materials.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Resin cements are crucial for dental restorations.
- Standardized bond strength testing is essential for material selection.
- ISO TR 110405 provides guidelines for bond measurement.
Purpose of the Study:
- To compare tensile and shear bond strengths of experimental and commercial resin cements.
- To evaluate bond strength measurements according to ISO TR 110405.
- To analyze failure modes using visual and SEM observations.
Main Methods:
- Tensile and shear bond tests were conducted on bovine enamel and dentin.
- Resin composite rods were bonded to prepared tooth substrates.
- Bond strengths were measured after 24 hours, with failure analysis via visual inspection and SEM.
Main Results:
- Significant differences in bond strengths were observed between tensile and shear tests for enamel and dentin substrates.
- Shear bond tests consistently produced higher values than tensile tests.
- SEM analysis revealed significant differences in fracture morphology, despite visual similarities.
Conclusions:
- Current bond test methods exhibit deficiencies, potentially influenced by substrate variables.
- A refined test model is needed to identify optimal stress types (tensile vs. shear) for diverse restorations.
- Informed test selection is critical for reliable data prior to clinical trials.