Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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Effect of the speed sintering schedule on the marginal and internal gaps of multi-layered zirconia prothesis

급속소결이 다층 지르코니아 치과보철물의 변연 및 내면 적합도에 미치는 영향

  • Kim, Se-Yeon (Department of Dental Laboratory Science, College of Health Science, Catholic University of Pusan) ;
  • Kim, Jae-Hong (Department of Dental Laboratory Science, College of Health Science, Catholic University of Pusan)
  • 김세연 (부산가톨릭대학교 보건과학대학 치기공학과) ;
  • 김재홍 (부산가톨릭대학교 보건과학대학 치기공학과)
  • Received : 2022.02.11
  • Accepted : 2022.03.16
  • Published : 2022.03.30
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Abstract

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 ingredients 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 fabricated, 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 ㎛, 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.

Keywords

Acknowledgement

This paper was supported by 2020 RESEARCH FUND offered from Catholic University of Pusan.

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