1032 ハイドロキシアパタイトのレーザ接合(G02-4 バイオエンジニアリング(4),G02 バイオエンジニアリング)

概要

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Implants using in orthopedics or dentistry have been usually fixed to bone tissue by other artificial bonding material such as bone cement or clinical screws. However, rigid bonding requires long duration between bone and implant. It is important to develop the bonding technique between bones and implants directly. Laser technique is effective tool for bonding metals. Laser beam has high energy density thus it can process the small area of material in short duration. This study has proposed the application of laser-processing technique for the bonding of bone and implant material. The cortical bones in the diaphysis of bovine femur were used as a bone specimen, and the composite materials consist of hydroxyapatite ceramics and glass materials were used as implant materials. The laser-processing was conducted by using CO_2 laser resonator. As a result, we observed cracks near the melted portion of apatite ceramic due to laser irradiation. The generation of cracks was found to reduce by adding glass materials with low linear coefficient of expansion. We also confirmed the mechanical fixation of both materials due to form the porous bone-implant interface with bubbles.
2007-09-07