クラウン・ブリッジ領域へのチタンの応用

DOI Web Site 被引用文献10件 参考文献32件

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  • Application of Titanium for Fixed Restorations.

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Although titanium has been cast for over 50 years, it has only been recently that nearly precise casting has been attainable. Titanium is well known for its general biocompatibility and very low allergic potential. The difficulties with cast titanium for dental purposes include high melting temperature and high reactivity, low casting efficiency, inadequate expansion of investment, casting porosity, and difficulty in polishing this metal. Recently, improvements in processing techniques such as casting, computer-aided manufacturing, and spark erosion have made dental titanium restorations possible, and titanium is widely used in fixed restoration. It is expected that titanium will be applied to hard resin facing crown, ceramometal crown, post of the abutment tooth and machine-milled metal of CAD/CAM system. However, when titanium is applied with hard resin adhering metal and porcelain fusing metal, problems of strong oxidation of the metal surface and coarse oxidative adhesion arise. Therefore, how the treatment of titanium surface affected the adhesive strength between titanium and hard resin and the oxidation heat treatment affected the bonding strength for clinical applications were investigated. Because of fine mechanical strength and positive biologic properties of pure titanium, it is suited for the fabricated post of an endodontically-treated tooth. Since the CAD/CAM system utilizes a milling machine, casting is unnecessary; therefore, titanium can exhibit its original properties. The CAD/CAM system copes with pure titanium in a short time, and hard resin is adhered with it or porcelain is fused to it. Conventional soldering techniques do not work in titanium because of its passivated oxide layer and high reactivity. The laser welding technique using titanium to join the sectioned ends has demonstrated less heat affect and more accuracy than the conventional soldering technique.

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