지르코니아의 소결 후 특성
Surface Characteristics of Ground and Post-Sintered Zirconia
김민정, 김임선, 최병환, 김원기,
소속 상세정보
김민정 ( Kim Min-Jeong ) - 경북대학교 의용생체공학과
김임선 ( Kim Im-Sun ) - 대구보건대학교 치기공과
최병환 ( Choi Byung-Hwan ) - 대구보건대학교 치기공과
김원기 ( Kim Won-Gi ) - 대구보건대학 치기공과
KMID : 0362120160380030157
Abstract
Purpose: It is to compare and evaluate the change of the wear rate and phase variation of the Zirconia before and after the sintering after the grinding by a high speed equipment manufactured for the Zirconia.
Methods: The specimen of the sintered Zirconia was manufactured as size of 15㎜×15㎜×2㎜. The grinding has been applied to each of all pieces of each test groups for a minute fit for each condition at same speed of 50,000 rpm by a diamond bur at high speed handpiece with injection of the air and water. For the observation of the surface before and after the sintering of the each test piece, the cross section of it was observed as 100 magnification by a scanning electron microscope after it was coated by PT, and the diffraction analysis was performed by XDR to compare the crystal phase of the Zirconia. The average surface roughness value of all specimens were evaluated. The wear test was performed at room temperature by applying a load of 1kg for 120,000 cycles for the chewing period 6 months. Wear was analyzed for the enamel cusps by measurement of the vertical substance loss with a laser scanner.
Conclusion: The phase variation from the tetragonal phase to the monoclinic phase was confirmed in the test group of the pre-sintered Zirconia after the grinding, and the value of the surface roughness and the wear rate was increased in experimental group.
키워드
grinding; handpiece; sintering; zirconia
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