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Three types of bending tests -the 3-point bending test, 4-point bending test and biaxial flexural test- were performed to examine the correlations among the testing methods for dental hard resins (HRs). The results for 5 HRs showed that the bending strengths in descending order were: biaxial flexural strength>3-point bending strength>4-point bending strength. Regression analysis of the test methods indicated that the coefficients of determination were large for all test methods; the largest was for the combination of the 4-point bending test and biaxial flexural tests. The Weibull moduli ranged from 5.42 to 10.61, and a similar descending-order trend was found in the Weibull characteristic strength (S0) of the test methods. The biaxial flexural test method is thus a valid test of the flexural strength of dental hard resins.

Citation

Daisuke Miura, Taira Miyasaka, Harumi Aoki, Yusuke Aoyagi, Yoshiki Ishida. Correlations among bending test methods for dental hard resins. Dental materials journal. 2017 Jul 26;36(4):491-496

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PMID: 28420833

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