羟基磷灰石牙槽嵴加高与骨融合式种植体同期植入的有限元分析

Finite Element Analysis of Osteointegrated Implant Fixed in Hydroxylapatite Augmentation

以骨膜下种植体固定羟基磷灰石颗粒加高的牙槽嵴，并同期植入骨融合式种植体为实验组，以单独植入的骨融合式种值体为对照组建立有限元分析模型，分别在两组骨融合式种植体的顶端，沿其长轴垂直加载４０ｋｇ的力。结果显示：实验组骨融合式种植体周围牙槽嵴顶部的压在力较对照组增加了３６．３０５４Ｎ／ｍｍ２，约３０．３５％，而牙槽嵴顶部与骨融合式种植体界面的切应力较对照组减少了７０．４０５８Ｎ／ｍｍ２，约１９．４６％。表明这种同期植入的修复方法有助于减少骨融合式种植体边缘骨的吸收，提高种植体的成功率。

The subjects were divided into two groups:the expoimental group (BMP-HA combined material+subperiosteal implant+osteointegrated implant) and the control group (osteointegrated implant). Finite element model was made,a 40kg force was added vertically to the osteointegrated implant top to analysis the stress distribution and compare the stress on the alveolar ridge and that on the interface of hydroxylapatite and the coteointegrated implant.The results showed that the stress distribution in the experimental group was similar to that of the control group, which was concentrated on the neck and the bottom of osteointegrated implant.In contrast with control group.the compressive stress on the alveolar ridge in experimental group increased by 36.3054 N/mm2, accounting about 30. 35%, but the shearing stress on the interface between hydroxylapatite and osteointegrated implant was reduced by 70. 4058 N/mm2,accounting about 19. 46%, The results suggested that this method of simultaneous osteointegrated implant helped to decrease the atrophy of the alveolar ridge and to increase the service life of osteointegrated implant with the reduced ahearing stress.