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. 2020 Nov 16;13(22):5162.
doi: 10.3390/ma13225162.

Reliability of Different Bending Test Methods for Dental Press Ceramics

Daisuke Miura  1 , Yoshiki Ishida  1   2 , Taira Miyasaka  1 , Harumi Aoki  1 , Akikazu Shinya  1   3
Affiliations

Reliability of Different Bending Test Methods for Dental Press Ceramics

Daisuke Miura et al. Materials (Basel). .

Abstract

Objective: This study investigates the reliability of different flexural tests such as three-point-bending, four-point bending, and biaxial tests, in strengthening the dental pressed ceramics (DPCs) frequently used in clinical applications.

Methods: The correlations between the three types of bending tests for DPCs were investigated. Plate-shaped specimens for the three-point and four-point bending tests and a disc-shaped specimen for the biaxial bending test were prepared. Each bending test was conducted using a universal testing machine.

Results: The results for six DPCs showed that the flexural strength in descending order were the three-point flexural strength, biaxial flexural strength, and four-point flexural strength, respectively. Then, a regression analysis showed a strong correlation between each of the three test methods, with the combination of four-point and biaxial flexural strength showing the highest values. The biaxial flexural strength was not significantly different in the Weibull coefficient (m) compared to the other tests, with the narrowest range considering the 95% interval. The biaxial bending test was found to be suitable for materials with small plastic deformation from the yield point to the breaking point, such as DPCs.

Keywords: biaxial flexural test; dental press molded ceramics (DPCs); weibull coefficient.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic diagram of the equipment used in each bending test. Upper: Three-point bending test, Middle: Four-point bending test, Lower: Biaxial bending test.
Figure 2
Figure 2
Average flexural strength (** p < 0.05, Standard deviation).
Figure 3
Figure 3
The correlations between the average flexural strength of the three test methods. (a) 3-Point vs. 4-point, (b) 4-point vs. biaxial, (c) 3-point vs. biaxial.
Figure 3
Figure 3
The correlations between the average flexural strength of the three test methods. (a) 3-Point vs. 4-point, (b) 4-point vs. biaxial, (c) 3-point vs. biaxial.
Figure 4
Figure 4
Weibull plots for each test. (a) 3-Point flexural strength, (b) 4-point flexural strength, (c) biaxial flexural strength.
Figure 5
Figure 5
The correlations between the Weibull characteristic strength (S0) of the three test methods. (a) 3-Point vs. 4-point, (b) 4-point vs. biaxial, (c) 3-point vs. biaxial.
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References

    1. Suzuki H., Hata Y. A mechanical study on new ceramic premolar crowns effects of different loading conditions—The relation between ceramics materials and abutment materials. Jpn. Prosthodont. Soc. 1989;33:283–293. doi: 10.2186/jjps.33.283. - DOI - PubMed
    1. Ukon S., Hisama K., Ogata T., Fukaura Y., Katsumata T., Ishikawa H., Yasumoto M., Matsuura T. A Clinical Evaluation of the Strength of Castable Ceramics (OCC) Crown during a 5-year Follow-up. Jpn. Prosthodont. 1997;41:495–501. doi: 10.2186/jjps.41.495. - DOI
    1. Saitou O., Nakamura T., Takashima F., Maruyama T. The Influence of the Color of the Abutment Tooth on the Color of All Ceramic Crowns. Jpn. Prosthodont. 1996;40:276–283. doi: 10.2186/jjps.40.276. - DOI
    1. Magne P., Schlichting L.H., Maia H.P., Baratieri L.N. In vitro fatigue resistance of CAD/CAM composite resin and ceramic posterior occlusal veneers. J. Prosthet. Dent. 2010;104:149–157. doi: 10.1016/S0022-3913(10)60111-4. - DOI - PubMed
    1. Aita H., Ueda Y., Yorimoto T., Hikita K., Ohata N., Uchiyama Y. A atudy on creating the tooth crown basic models used in CAD system for crown restorations. Jpn. Prosthodont. 1998;42:832–838. doi: 10.2186/jjps.42.832. - DOI

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