インパルス衝撃応答と骨髄圧によるオッセオインテグレーションの評価

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  • Evaluation of Osseointegration with an Impulse Response and Bone Marrow Pressure.

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Purpose: The purpose of the present study was to evaluate the difference for stress transfer between titanium (Ti) and hydroxyapatite (HA) implants by measuring bone marrow pressure using a catheter pressure transducer, and then to clarify the relationship between the histological and biomechanical properties.<BR>Methods: Ti and HA implants were inserted in the tibiae of rabbits. About 10 weeks following implantation, a hole, 1mm in diameter, was drilled in the bone distal to the implant, and a fine catheter pressure transducer was placed in the bone marrow through a tube. After the abutment was connected to the implant, the top of the abutment was vertically tapped with an impulse hammer, and the acceleration signal from the hammer, and the pressure signal from the catheter pressure transducer, were examined. In addition, histological examination was performed on each implant.<BR>Results: Maximum bone marrow pressure (BMP) with Ti and HA was 117.4±54.8mmHg and 90.3±30.6mmHg, respectively. A significant difference was observed (p<0.05). Moreover, variation of the BMP with Ti was significantly larger than that with HA (p<0.05). A negative correlation coefficient between the time of contact recorded in the impulse and BMP was found with Ti. As to histological examination of the bone structure around several implants, no significant difference was found between Ti and HA implants.<BR>Conclusion: The results show that the stress transfer is different between Ti and HA implants, using dynamics of bone marrow pressure. Little relation was found between biomechanical properties and histological views. The present study suggests that the evaluation of osseointegration requires consideration of biomechanical properties.

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