Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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Evaluation of strength according to surface abrasion of lithium disilicate glass ceramic by 3-point bending strength test

3점 굽힘강도 시험을 통한 Lithium disilicate glass ceramic의 표면 연마 정도에 따른 강도 평가

  • Lee, Ha-Na (Department of Public Health Science, Gradnate School, Korea University) ;
  • Kim, Eo-Bin (Department of Public Health Science, Gradnate School, Korea University) ;
  • Kang, Seen-Young (Department of Public Health Science, Gradnate School, Korea University) ;
  • Lee, Kyung-Eun (Department of Public Health Science, Gradnate School, Korea University) ;
  • Kim, Ji-Hwan (Department of Public Health Science, Gradnate School, Korea University) ;
  • Kim, Woong-Chul (Department of Public Health Science, Gradnate School, Korea University)
  • 이하나 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김어빈 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 강신영 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 이경은 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김지환 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김웅철 (고려대학교 대학원 보건과학과 치의기공전공)
  • Received : 2018.01.03
  • Accepted : 2018.03.05
  • Published : 2018.03.30
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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 $307.14{\pm}23.28MPa$ 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.

Keywords

References

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