반복성형이 2 종류 열가압 성형용 글라스-세라믹의 기계적 성질에 미치는 영향
Effect of repeat processing on mechanical properties of two pressable glass-ceramic dental materials
임청하, 신재우, 석정진, 지정희, 이민호, 배태성,
소속 상세정보
임청하 ( Lim Chung-Ha ) - 전북대학교 대학원 바이오나노시스템공학과
신재우 ( Shin Jae-Woo ) - 전북대학교 대학원 바이오나노시스템공학과
석정진 ( Seok Jung-Jin ) - 전북대학교 치의학전문대학원 치과생체재료학교실
지정희 ( Ji Jeong-Hui ) - 전북대학교 대학원 바이오나노시스템공학과
이민호 ( Lee Min-Ho ) - 전북대학교 치의학전문대학원 치과생체재료학교실
배태성 ( Bae Tae-Sung ) - 전북대학교 치의학전문대학원 치과생체재료학교실
KMID : 1035320140410010001
Abstract
The purpose of this study was to evaluate the effect of repeat processing on the mechanical properties of two pressable glass-ceramic dental materials. IPS e.max ZirPress of apatite-reinforced glass-ceramic material and IPS e.max Press of lithium disilicate-reinforced glass-ceramic material were used in this study. Twenty disc specimens (13.0 mm × 1.5 mm) for each material were prepared by 4 times repeated heat-pressing. Sprue and button parts were reused to make specimens for every repeated heat-pressing. This study compared the biaxial flexural strength, Vickers hardness, fracture toughness, and the X-ray diffraction response. Microstructures were examined using a scanning electron microscope (SEM). IPS e.max Press showed the decrease of the biaxial flexural strength and fracture toughness values and the increase in sizes of the lithium disilicate crystals after repeat processing for 3 times. IPS e.max ZirPress showed the decrease in Vickers hardness value after repeat processing for 2 times. Based on these results of this study, clinically acceptable limits of the repeat number of heat-pressing were twice in the case of the IPS e.max Press and to be once in the case of the IPS e.max ZirPress.
키워드
mechanical property; pressing; glass-ceramic
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