대한치과기공학회지 (Journal of Technologic Dentistry)

  • 제40권1호
  • /
  • Pages.33-40
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  • 2018
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  • 1229-3954(pISSN)
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  • 2288-5218(eISSN)
대한치과기공학회 (Korean Academy of Dental Technology)
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경화방법이 치과용 경석고의 기계적 특성에 미치는 영향

Influence of mechanical properties of ultra-dental stone on setting methods

  • 임용운 (경동대학교 치기공학과) ;
  • 황성식 (경동대학교 치기공학과) ;
  • 김사학 (경동대학교 치기공학과) ;
  • 최재우 (충북보건과학대학교 치기공과) ;
  • 정수하 (충북보건과학대학교 치기공과) ;
  • 김시철 (충북보건과학대학교 치기공과)
  • Im, Yong-Woon (Department of Dental Technology, Medical Campus, Kyungdong University) ;
  • Hwang, Seong-Sig (Department of Dental Technology, Medical Campus, Kyungdong University) ;
  • Kim, Sa-Hak (Department of Dental Technology, Medical Campus, Kyungdong University) ;
  • Choi, Je-Woo (Department of Dental Laboratory Technology, Chungbuk Health & Science University) ;
  • Jeong, Su-ha (Department of Dental Laboratory Technology, Chungbuk Health & Science University) ;
  • Kim, Si-Chul (Department of Dental Laboratory Technology, Chungbuk Health & Science University)
  • 투고 : 2018.01.03
  • 심사 : 2018.03.05
  • 발행 : 2018.03.30
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초록

Purpose: The purpose of this study was to investigate the influence of mechanical properties of various ultra-dental stone by setting methods. Methods: 240 cylinder specimens($10mm{\times}20mm$) were prepared from three ultra-dental stones(Gemma, Die keen and Fuji rock; n = 80) in accordance with the manufacturers' recommendations. Half of the specimens of each stone(n = 40) were dried in open air within a room temperature; the other half(n = 40) underwent in a silicone rubber mold in open air for 30 minutes and then were dried in a microwave oven for 10 minutes to 600W. Compressive strength(CS), compressive modulus(CM) and diametral tensile strength(DTS) conducted until fracture using Instron 5966 at each of the following periods: 1 and 24 hours from mixing. One-way analysis of variance and Scheffe's post hoc test were performed for statistical comparisons at a significance level of P<.05. Results: The CS and CM values in all dental stone indicated highest after 24h(54.25 MPa < ) than the values for specimens dried in microwave method. The DTS values revealed the highest microwave method. However, in 24h, FJ(Fu-ji rock) and GM(Gemma) had lower mechanical properties than air. Conclusion : Within the limitations of this study, CS did not influence by microwave method but DTS affected according to the setting.

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