CO_2レーザー照射によるHAp粉末の象牙細管封鎖に関する基礎的研究
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概要
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[Object] The aim of this study is; (1) to determine proper laser irradiation output without a pulp irritation onto cavity floor, and (2) to examine an improvement of the cavity floor for an adhesion in resin restoration and a sealing of dentinal tubule by the combined use of ceramic powders and a CO_2-laser. [Materials] Extracted human molars by a clinical reason, ten kinds of ceramic powders; HAp, FAp, αTCP, βTCP, TTCP, calcium carbonate (CaC), coral, ZPC (ZnO), NeC (ZnO), GIC (glass-ionomer cement), and manipulater type CO_2-laser were used in this study. [Methods] 1) Temperature changes of the dentin surface and of the opposite side of that which was irradiated by CO_2-laser at a distance of 10mm were measured. 2) The surface morphologies of various ceramic discs after CO_2-laser irradiation were observed by digital microscopy and SEM. 3) The dentin surface after various treatments and the section of composite resin filling into dentin cavity with the treatments were examined by microscopic observations. [Results] When the laser irradiation of less than 1 watt (time: 0.9 seconds) was performed, the temperature rise at the opposite side of laser irradiation in dentin plate (2mm) was below a guide line temperature (5℃) without pulp irritation. However, in the case of dentine plate with less than 2mm in thickness and/or the laser output with more than 2 watts, the temperature rise was over 5℃. Six ceramic powders except for βTCP, TTCP, CaC, coral were melted completely by the laser irradiation of 0.5 watt, and the other four ceramic powders were melted by 1watt irradiation. Laser irradiation by 0.5 watts of the dentin cavity floor with placement of HAp powders and treatment of a 10%-sodium hypochloride solution led the cavity floor to formation of colorless glass-like complex layer and to improvement of marginal sealing in the composite resin restoration. The sealing of dentinal tubule was confirmed in the lower complex layer.
- 福岡歯科大学学会の論文
- 2006-09-25