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KMID : 1035320170440020171
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Korean Society for Dental Materials
2017 Volume.44 No. 2 p.171 ~ p.178
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The effects of the number of times dipped in coloring liquid and final sintering temperature on flexural strength of zirconia ceramics : Zirconia ceramics having improved transparency
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Kong Moon-Chun
Kim Kap-Jin
Kwon Tae-Yub
Hong Min-Ho
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Abstract
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The purpose of this study is to investigate the effect of number of times dipped in coloring liquid and sintering temperature on the flexural strength of zirconia ceramic. In this study, using a zirconia block having improved transparency, specimens with size of 25 mm × 2 mm × 1.5 mm were fabricated. The zirconia ceramic specimens were divided into three groups according to the number of times dipped in coloring liquid by 0, 2 and 4 times, and dyed in the coloring liquid to give color to each specimen. Then, after sintering them at the final temperature of 1,450°C and 1,600°C, f lexural strength was measured using a universal testing machine (total 6 group, n=10 for each group). Also, a scanning electron microscopy (SEM) was performed to observe its microstructure, and the data obtained through the experiment were analyzed with two-way ANOVA. The results of the flexural strength analysis show that the highest value was measured 762.3±42.3 MPa in EKL2 group, while the lowest value was 516.4±77.1 MPa in EKH4 group. According to the results of the two-way ANOVAs, flexural strength was not related with interaction between sintering temperature and number of times dipped in coloring liquid (R2=0.737). However, there were statistically significant differences in flexural strength depending on sintering temperature (P<0.001). The flexural strength of zirconia ceramics having improved transparency was dependent on sintering temperature. The number of times dipped in the coloring liquid did not affect flexural strength of the zirconia ceramic having improved transparency.
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KEYWORD
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Zirconia, Coloring liquids, three-point flexural strength
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