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http://dx.doi.org/10.14347/kadt.2020.42.2.121

Effect of zirconia ceramic sintering condition on the precision of fit in dental restorations  

Kim, Jae-Hong (Department of Dental Laboratory Science, College of Health Science, Catholic University of Pusan)
Kim, Ki-Baek (Department of Dental Lab Technology, Daejeon Health Institute of Technology)
Publication Information
Journal of Technologic Dentistry / v.42, no.2, 2020 , pp. 121-128 More about this Journal
Abstract
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.
Keywords
Adaptation; CAD/CAM; Dental zirconia; Sintering condition;
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