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Correlations among bending test methods for dental hard resins.
Daisuke Miura1, Taira Miyasaka1, Harumi Aoki1
1Department of Dental Materials Science, School of Life Dentistry at Tokyo, The Nippon Dental University.
Dental Materials Journal
|April 20, 2017
Summary
Comparing three bending tests for dental hard resins (HRs), the biaxial flexural test showed the highest strength. This method is validated for assessing dental resin flexural strength, with strong correlations between test types.
Area of Science:
- Biomaterials Science
- Dental Materials Engineering
- Mechanical Testing
Background:
- Dental hard resins (HRs) require reliable mechanical property assessment.
- Standardized testing methods are crucial for material characterization and quality control.
- Understanding the correlation between different bending tests is essential for accurate flexural strength evaluation.
Purpose of the Study:
- To compare the flexural strength results obtained from three distinct bending tests for dental hard resins (HRs).
- To investigate the correlations among the 3-point bending test, 4-point bending test, and biaxial flexural test.
- To validate the biaxial flexural test as a suitable method for assessing the flexural strength of dental HRs.
Main Methods:
- Performed three types of bending tests: 3-point bending, 4-point bending, and biaxial flexural tests.
- Utilized five different dental hard resins (HRs) for the comparative analysis.
- Conducted regression analysis to determine the coefficients of determination between test methods.
Main Results:
- Bending strengths consistently ranked as: biaxial flexural strength > 3-point bending strength > 4-point bending strength.
- High coefficients of determination were observed across all test method combinations, indicating strong correlations.
- The largest coefficient of determination was found between the 4-point bending test and the biaxial flexural test.
- Weibull moduli ranged from 5.42 to 10.61, with a similar descending trend observed in Weibull characteristic strength (S₀).
Conclusions:
- The biaxial flexural test is a valid and reliable method for determining the flexural strength of dental hard resins.
- The findings support the use of the biaxial flexural test for consistent and comparable material characterization.
- Strong correlations exist between the tested methods, suggesting interchangeability under specific conditions, but highlighting the biaxial test's superior sensitivity.