3점 굽힘강도 시험을 통한 Lithium disilicate glass ceramic의 표면 연마 정도에 따른 강도 평가
Evaluation of strength according to surface abrasion of lithium disilicate glass ceramic by 3-point bending strength test
이하나, 김어빈, 강신영, 이경은, 김지환, 김웅철,
소속 상세정보
이하나 ( Lee Ha-Na ) - 고려대학교 대학원 보건과학과
김어빈 ( Kim Eo-Bin ) - 고려대학교 대학원 보건과학과
강신영 ( Kang Seen-Young ) - 고려대학교 대학원 보건과학과
이경은 ( Lee Kyung-Eun ) - 고려대학교 대학원 보건과학과
김지환 ( Kim Ji-Hwan ) - 고려대학교 대학원 보건과학과
김웅철 ( Kim Woong-Chul ) - 고려대학교 대학원 보건과학과
Abstract
Purpose: The purpose of this study is to investigate the effect of lithium disilicate glass ceramic polishing on the strength of the final prosthesis.
Methods: Fourteen lithium disilicate glass ceramic specimens were prepared. These were randomly divided into two groups of seven(LPG: low polishing group, HPG: high polishing group). In LPG, SiC paper was sequentially polished using 300, 600, 800, 1000 grit, and the specifications of the test piece were adjusted. HPG was sequentially polished using 300,600, 800, 1000, 1200, 1500, and 2000 grit. Two groups of specimens are executed 3- point bending test. Using the statistical program SPSS 22.0, the average values of the strengths of the two groups were compared in the Mann-Whiteney test. The significance level was set at 0.05.
Results: The mean strength value of HPG was measured at 307.14 ± 23.28 MPa significantly higher than LPG(p<0.001).
Conclusion : The final polishing of the prosthesis is aesthetically important but has proven to play an important role in the flexural strength, early fracture, and prolongation of the prosthesis.
키워드
Lithium disilicate; Glass ceramic; 3-point bending test; Strength; Polishing
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