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Effect of zirconia ceramic sintering condition on the precision of fit in dental restorations
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±èÀçÈ« ( Kim Jae-Hong ) - Catholic University of Pusan College of Health Sciences Department of Dental Laboratory Science
±è±â¹é ( Kim Ki-Baek ) - Daejeon Health Institute of Technology Department of Dental Laboratory Technology
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¡É). 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(¥á=0.05).
Results: The overall adaptation of the zirconia cores were as follows; ss-1hr: 36.18¡¾5.2§, ss-3hr: 39.55¡¾3.9§, cs-9hr: 46.62¡¾4.3§. 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¡É 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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Adaptation; CAD/CAM; Dental zirconia; Sintering condition
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