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KMID : 0362120220440010001
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Journal of Technologic Dentistry
2022 Volume.44 No. 1 p.1 ~ p.7
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Effect of the speed sintering schedule on the marginal and internal gaps of multi-layered zirconia prothesis
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Kim Se-Yeon
Kim Jae-Hong
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Abstract
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Purpose: The purpose of this in vitro study is to evaluate the clinical acceptability of the marginal discrepancies and internal spacing of multi-layered zirconia prothesis by speed sintering.
Methods: The two specimen types come from the same manufacturer but differ in the in-gredients in layered zirconia and indication, that is anterior and posterior. The designs of both specimens were full contour crowns, and a total of 20 pieces were repeatedly fabricat-ed, 10 for each group. The specimens were divided into two subgroups (n=10) and sintered with various total times (4 hours, 8 hours) at the maximum temperature (1,530℃). The gap between the two groups of multi-layered zirconia prostheses was measured using a silicone replica technique of 2D analysis method. The independent sample t-test was then used to compare and analyze the data obtained from the two groups (α=0.05).
Results: The marginal and internal gap was superior in the 8-hour compared to the 4-hour group, and the results exhibited significant differences (p<0.05). All specimens showed that using the speed sintering schedule does not exceed the clinically permitted value of 120 μm, meaning zirconia prothesis using the speed sintering was adequate.
Conclusion: The sintering condition is shown to affect the marginal and internal gaps of multi-layered zirconia restoration.
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KEYWORD
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Internal gap, Marginal gap, Multi-layered zirconia, Silicone replica technique, Speed sintering
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