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Location of implants in the interforaminal region of the mandible and the consequences for the design of the superstructure 总被引:1,自引:0,他引:1
H.J.A. MEIJER F.J.M. STARMANS W.H.A. STEEN F. BOSMAN 《Journal of oral rehabilitation》1994,21(1):47-56
The location and the number of implants to support an overdenture is of major importance for the superstructure design. Sometimes, jaw bone anatomy or posteriorly placed implants enforce the use of an angular bar to achieve a position above the alveolar ridge. Loads on such a bar may introduce a moment on the implants which can result in high bone stresses and eventually the loss of the implants.
This study on stress distribution in the bone around the implants in an edentulous mandible was performed using a three-dimensional finite element model. One model with two implants placed just anteriorly of the mental foramen and connected with an anteriorly placed bar, following the curvature of the alveolar ridge, was compared with two other designs. First with a similar model but now without a bar and secondly with a model with four implants connected with straight bars.
It is concluded that loading a bar, which is placed anteriorly of the interconnecting line between two implants, causes extremely large compressive and tensile stress concentrations in the bone around the implants. Therefore, in those cases, it is advised not to connect the implants or, in case a bar-clip attachment is preferred, to place additional implants in the frontal region. 相似文献
This study on stress distribution in the bone around the implants in an edentulous mandible was performed using a three-dimensional finite element model. One model with two implants placed just anteriorly of the mental foramen and connected with an anteriorly placed bar, following the curvature of the alveolar ridge, was compared with two other designs. First with a similar model but now without a bar and secondly with a model with four implants connected with straight bars.
It is concluded that loading a bar, which is placed anteriorly of the interconnecting line between two implants, causes extremely large compressive and tensile stress concentrations in the bone around the implants. Therefore, in those cases, it is advised not to connect the implants or, in case a bar-clip attachment is preferred, to place additional implants in the frontal region. 相似文献
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目的:调查秦始皇帝陵区山任陶窑遗址中人体颌骨第三磨牙的萌出情况。方法:选用秦代人体颌骨98副,观察萌出特点,计算阻生率,分析阻生情况。结果:通过对98副标本的观察,发现秦代人同现代人类一样可发生第三磨牙的多种萌出状况,其中包括先天缺失、畸形牙、阻生、正常萌出等。结论:秦始皇帝陵区山任陶窑遗址中人体颌骨具有同现代人类一样的第三磨牙萌出特点。 相似文献
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