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KMID : 0362120200420020121
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Journal of Technologic Dentistry
2020 Volume.42 No. 2 p.121 ~ p.128
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Effect of zirconia ceramic sintering condition on the precision of fit in dental restorations
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Kim Jae-Hong
Kim Ki-Baek
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Abstract
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Purpose: This study aimed to investigate the effects of the sintering conditions of zirconia core on the adaptability.
Methods: Ten specimens of each of commercial brand of zirconia(Razor 1100, U&C international, Seoul, Korea) were made and sintered under three different conditions. Specimens were divided into three subgroup(n=10) and sintered with various total time(1hr, 3hr, 9hr) at the maximum temperature(1500℃). The digitized data was superimposed with 3D inspection software to quantitatively obtain the adaptation of a zirconia core, and visual differences were confirmed with a color map. The root mean square(RMS) values of group were statistically analyzed with one-way ANOVA(α=0.05).
Results: The overall adaptation of the zirconia cores were as follows; ss-1hr: 36.18±5.2㎛, ss-3hr: 39.55±3.9㎛, cs-9hr: 46.62±4.3㎛. They were statistically significant differences between groups for adaptation(p<0.05).
Conclusion: Based on the results of this study, it could be considered that sintering condition of 1500℃ and 1~3 hour is recommended for the better marginal and internal fit. Speed sintering can be widely utilized to fabricate zirconia prothesis as the properties of those almost are to dentistry uses.
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KEYWORD
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Adaptation, CAD/CAM, Dental zirconia, Sintering condition
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