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KMID : 0362120210430020035
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Journal of Technologic Dentistry
2021 Volume.43 No. 2 p.35 ~ p.41
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A study of the changes in the strength and microstructure of the zirconia crown surface by the glazing number
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Oh Seon-Mi
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Abstract
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Purpose: This study aimed to investigate the flexural strength and surface microstructure of the zirconia crown according to the number of glazing zirconia prostheses.
Methods: The specimens were made as follows. A specimen without glazing: 1ea, first glazed specimens (group B): 10ea, second glazed specimens (group C): 10ea, third glazed specimens (group D): 10ea. Three-point measuring strength equipment and electron microscopes were used for strength measurement and microstructure observation. As for statistical analysis, one-way ANOVA and t-test (level of significance level=5%) were used to determine the difference in the change in flexural strength according to the number of glazing zirconia prostheses.
Results: ANOVA analysis of groups B (1st glazing), C (2nd glazing), and D (3rd glazing) revealed that the change in strength between the groups is statistically significant (p=0.023).
The Mann?Whitney test for each group revealed that the difference in flexural strength between groups B and C was not statistically significant (z=?0.302, p=0.762) while that between groups C and D was statistically significant (z=?0.257, p=0.01). Microstructure observation revealed 3 changes in the microstructure of the surface of the glaze powder were observed.
Conclusion: According to the number of glazing zirconia prostheses, it was found that the difference in strength between groups was statistically significant, and changes in the microstructure were observed.
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KEYWORD
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Flexural strength, Glazing, Three-point bending test, Zirconia
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