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KMID : 1035320160430030247
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Korean Society for Dental Materials
2016 Volume.43 No. 3 p.247 ~ p.255
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Fabrication of Composite Resin Block Using Lithium Disilicate Glass-Ceramics for Dental CAD/CAM Restoration
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Park Jin-Hong
Park Jong-Hwan
Ko Yeong-Mu
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Abstract
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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.
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KEYWORD
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Dental, Aesthetic restoration, CAD/CAM, Block, Composite resin, Ceramic filler, Lithium disilicate
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