インプラント補綴としてのレジン歯の物性改善： DLC コーティングによる吸水性，摩耗性および細胞毒性の改善

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  • Improvement in the Properties of Resin Teeth for Implant Prostheses: Improvement of Water Absorption, Wear and Cytotoxicity by Diamond-like Carbon Coating

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The purpose of this study was to clarify the effects of a diamond-like carbon (DLC) coating for improving the water absorption, wear and cytotoxicity of resin teeth for dental implant prostheses. Two kinds of resin teeth composed of polyethyl-methacrylate (PMMA) and urethane dimethacrylate (UDMA) were used. The DLC film was coated on the resin teeth to a thickness of less than 0.1 μm without impairing the esthetics by chemical vapor deposition (CVD). A brushing test of the resin teeth was carried out in water at room temperature for 24 h using a brushing machine. Amounts of water absorption and wear were measured by the change in weight after brushing. The effects of the DLC coating on cytotoxicity of the resin teeth were examined by growth curves of MC3T3-E1 osteoblast-like cells. After the brushing test, the weight of the uncoated resin teeth increased with time because water absorption was larger than wear loss. On the other hand, no weight change was observed in the DLC-coated resin teeth. Strong adhesion between the resin teeth and DLC was observed by Raman spectrum analysis. Cytotoxicity tests of both the extracted solution and powder of resin teeth indicated positive results, but the positive cytotoxicity became negative with the DLC coating.These results verified that the DLC coating improves the water absorption, wear and cytotoxicity of resin teeth, and that DLC-coated resin teeth may be more suitable for implant prostheses.

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