치과 CAD/CAM용 지르코니아의 소결 시 계류시간이 굴곡강도에 미치는 영향
Influence of Sintering Holding Time on Flexural Strength of Dental CAD/CAM Zirconia
전병욱, 이광영,
소속 상세정보
전병욱 ( Jeon Byung-Wook ) - 부산대학교 치의학전문대학원 치과재료학교실
이광영 ( Lee Gwang-Young ) - 부산대학교 치의학전문대학원 치과재료학교실
KMID : 1035320160430020185
Abstract
This study investigated the influence of sintering holding time on flexural strength of dental CAD/CAM zirconia. Thirty specimens of dental CAD/CAM zirconia were sintered at 1,500℃ applying three holding times(0, 2 and 5 h). The 3-point flexural strength of all specimens were measured with a universal testing machine, and analyzed by one-way ANOVA. The microstructural change was measured by FE-SEM and X-ray diffraction analysis were performed to estimate the phase transformation. The highest flexural strength was observed in groups sintered holding time of 2 hours(GS2 group). The flexural strength of the all specimens were not significantly different(p＞0.05). The increase of sintering time, the grain size of zirconia will increase and result in a decrease of flexural strength. Based on the present study, it could be considered that the ideal sintering condition of 1,500℃ for 2 hours is recommended for the better strength.
키워드
Dental CAD/CAM zirconia; Flexural strength; Grain growth; Holding time
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