리튬 다이실리케이트 결정화 유리를 이용한 CAD/CAM용 컴포짓 레진 블록의 제조
Fabrication of Composite Resin Block Using Lithium Disilicate Glass-Ceramics for Dental CAD/CAM Restoration
박진홍, 박종환, 고영무,
소속 상세정보
박진홍 ( Park Jin-Hong ) - 조선대학교 치의학전문대학원 치과재료학교실
박종환 ( Park Jong-Hwan ) - 조선대학교 치의학전문대학원 치과재료학교실
고영무 ( Ko Yeong-Mu ) - 조선대학교 치의학전문대학원 치과재료학교실
KMID : 1035320160430030247
Abstract
Fabrication of composite resin blocks by combining high-strength ceramic fillers and excellent-toughened resin matrix was investigated in this study. Ceramic fillers were heat-treated to crystallize the lithium disilicate phase, then milled and silanated. They were mixed with resin matrix, which was prepared by mixing TEGDMA into Bis-GMA with weight ratio of 4:6 with benzoyl peroxide as a thermal curing initiator as well butylated hydroxytoluene as a polymerization inhibitor, and thermal cured into blocks. Flexural strength, cured depth, water sorption, solubility, radio-opacity, distortion, cracking, porosity, blanching were determined according to ISO 4049, ISO 6872, and ISO 22112. Flexural strength of the fillers increased after crystallization in all composition and reached maximum 323.0 MPa. The optimum allowance of the thermal curing initiator was 0.3 wt% considering stability in shelf. The optimal thermal curing condition was 80℃ for 12 hrs due to distortion and cracking when cured at higher temperature for longer time. Flexural strength of the composite resin block was increased with increasing the content of the filler, then reached 198.0 MPa at 70 wt%. The fabricated composite resin block is expected to be CAD/CAM block in dental restoration.
키워드
Dental; Aesthetic restoration; CAD/CAM; Block; Composite resin; Ceramic filler; Lithium disilicate
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