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[种植体支持单冠修复中咬合接触强度对冠表面及支持骨应力分布的影响]

[Influence of intensity of occlusal contact in implant-retained single restoration on stress distributions of crown surface and supporting bone].

作者信息

Maezawa Nariyuki, Wakabayashi Noriyuki, Yokoyama Sawako, Shiota Makoto, Suzuki Tetsuya

机构信息

Oral Implantology and Regenerative Dental Medicine, Department of Masticatory, Function Rehabilitation, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University.

出版信息

Nihon Hotetsu Shika Gakkai Zasshi. 2007 Jul;51(3):582-91. doi: 10.2186/jjps.51.582.

Abstract

PURPOSE

This study investigated the influence of intensity of occlusal contact, or occlusal height of an implant-retained single restoration on the stress in the crown surface and supporting bone.

METHODS

A two-dimensional finite element model of the maxillary and mandibular first molars with supporting periodontal structures was created (Model M-M). One of the molars was replaced by a restoration retained by a thread-type implant to produce Model I-M (implant in maxilla) and Model M-I (implant in mandible). The models were isotropic and linearly elastic, except for the periodontal ligament with a non-linear material property to simulate the tooth movements. The tooth-to-tooth contact under the bite force was simulated by the vertical displacement of the mandible up to 0.24 mm from the initial occlusal contact. Non-linear contact analysis was conducted to calculate the stress in both the restoration and the supporting tissues.

RESULTS

To obtain a restoration that shows the same stress in the occlusal surface as that in the natural molars under the maximum bite force, the occlusal heights in Models I-M and M-I were to be reduced by 0.10 mm and 0.11 mm, respectively. The restorations were not expected to occlude with their natural molar antagonists under bite force lower than 13.0% and 15.8% of the maximum force, respectively.

CONCLUSION

Reduction in the intensity of the occlusal contact, or decreased occlusal height of an implant-retained single restoration, allows the establishment of an equivalent occlusal stress with the natural molars under the maximum bite force. This adjustment, either during fabrication or try-in procedure, can suppress excessive stress that may be created in the tissues. With this procedure, however, the restoration does not contact the antagonistic tooth under a relatively low bite force.

摘要

目的

本研究调查了咬合接触强度或种植体支持的单冠修复体的咬合高度对冠表面和支持骨应力的影响。

方法

创建了包含支持牙周结构的上颌和下颌第一磨牙的二维有限元模型(模型M-M)。其中一颗磨牙被螺纹型种植体支持的修复体替代,以产生模型I-M(种植体在上颌)和模型M-I(种植体在下颌)。除了具有非线性材料特性以模拟牙齿移动的牙周韧带外,模型为各向同性且线性弹性。通过下颌垂直位移模拟咬合力下的牙齿间接触,直至从初始咬合接触向上移动0.24mm。进行非线性接触分析以计算修复体和支持组织中的应力。

结果

为了获得在最大咬合力下咬合面应力与天然磨牙相同的修复体,模型I-M和M-I中的咬合高度分别要降低0.10mm和0.11mm。预计在咬合力分别低于最大力的13.0%和15.8%时,修复体不会与天然磨牙对颌牙咬合。

结论

降低咬合接触强度或降低种植体支持的单冠修复体的咬合高度,可在最大咬合力下建立与天然磨牙等效的咬合应力。在制作或试戴过程中的这种调整可以抑制组织中可能产生的过大应力。然而,通过此程序,修复体在相对较低的咬合力下不会与对颌牙接触。

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