경화방법이 치과용 경석고의 기계적 특성에 미치는 영향
Influence of mechanical properties of ultra-dental stone on setting methods
임용운, 황성식, 김사학, 최재우, 정수하, 김시철,
소속 상세정보
임용운 ( Im Yong-Woon ) - 경동대학교 치기공학과
황성식 ( Hwang Seong-Sig ) - 경동대학교 치기공학과
김사학 ( Kim Sa-Hak ) - 경동대학교 치기공학과
최재우 ( Choi Je-Woo ) - 충북보건과학대학교 치기공과
정수하 ( Jeoung Su-Ha ) - 충북보건과학대학교 치기공과
김시철 ( Kim Si-Chul ) - 충북보건과학대학교 치기공과
Abstract
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(10 mm × 20 mm) 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.
키워드
Ultra dental stone; Compressive strength; Diametral tensile strength
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