Glazing 횟수가 전장지르코니아에 미치는 굴곡강도와 표면 미세구조의 변화
A study of the changes in the strength and microstructure of the zirconia crown surface by the glazing number
오선미,
소속 상세정보
오선미 ( Oh Seon-Mi ) - Dongnam Health University Department of Dental Technology
Abstract
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.
키워드
Flexural strength; Glazing; Three-point bending test; Zirconia
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