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首页> 外文期刊>The International journal of oral & maxillofacial implants >Finite element analysis of effect of prosthesis height, angle of force application, and implant offset on supporting bone.
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Finite element analysis of effect of prosthesis height, angle of force application, and implant offset on supporting bone.

机译：假体高度，作用力角度和种植体偏移对支撑骨的影响的有限元分析。

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PURPOSE: This finite element analysis was conducted to determine the magnitude of stress in the supporting bone when implants were arranged in either a straight-line or an offset configuration. In addition, the effects of axial and nonaxial loading and changes in prosthesis height were assessed. MATERIALS AND METHODS: An 8-node hexahedral solid-element 3-dimensional finite element analysis model of the mandible was created using PATRAN software. Three titanium endosseous implants were placed in the model 7 mm apart. The center implant was placed on the line from the centers of the terminal implants (no offset), 1.5 mm lateral to this line (1.5-mm offset), or 3.0 mm lateral to this line (3.0-mm offset). Forces of 200 N were applied to a point corresponding to the center of the middle implant when the implants were in a straight-line configuration. Forces were applied in a straight vertical direction or in 15-degree increments to the vertical to a maximum of 60 degrees. Simulated type IV gold prostheses were made to simulate heights of 6 and 12 mm. RESULTS: The least stress in the supporting bone was found with vertical loading of the no-offset implants with the 6-mm prosthesis (3.12 MPa) followed by the same alignment with the 12-mm prosthesis (3.86 MPa). Changing the angle of force application by 15 degrees resulted in increased stress to the underlying bone, and the creation of an offset did not fully compensate for this increased stress. DISCUSSION: In contrast to previous studies, this study examined 3 elements not previously studied together in a single finite element analysis, using the maximum offset defined by normal anatomic contours of mandibular premolar and molar teeth, thereby describing the relative importance of clinically relevant methods for stress reduction. CONCLUSIONS: Vertical loading of an implant-supported prosthesis produced the lowest stress to the supporting bone. Changes in the angle of force application resulted in greater stress to supporting bone. Reduction in prosthesis height or use of an offset implant location for the middle implant reduced stress, but the reduction did not compensate for the increase found with off-axis loading.
机译：目的：进行这种有限元分析，以确定当植入物以直线或偏置配置时，支撑骨的应力大小。此外，评估了轴向和非轴向载荷以及假体高度变化的影响。材料与方法：利用PATRAN软件建立了下颌骨8节点六面体三维三维有限元分析模型。将三个钛质骨内植入物放置在相距7 mm的模型中。将中心植入物放置在距离末端植入物中心（无偏移）的线上，该线横向1.5毫米（偏移1.5毫米），或距该线横向3.0毫米（偏移3.0毫米）。当植入物为直线形时，将200 N的力施加到与中间植入物的中心相对应的点。力以笔直的垂直方向或以15度的增量施加到垂直方向，最大60度。制作了模拟IV型金假体以模拟6毫米和12毫米的高度。结果：在垂直偏置的情况下，采用6毫米假体（3.12 MPa）的无偏移植入物，然后与12毫米假体（3.86 MPa）相同的对齐方式，对支撑骨的应力最小。将作用力的角度更改15度会导致对下面的骨骼的应力增加，并且偏移的创建并不能完全补偿这种应力的增加。讨论：与先前的研究相反，本研究使用下颌前磨牙和臼齿的正常解剖学轮廓定义的最大偏移量，在单个有限元分析中检查了先前未一起研究的3个元素，从而描述了临床相关方法对于减轻压力。结论：植入物支撑的假体的垂直载荷对支撑骨产生的应力最小。施加力角度的改变导致对支撑骨的更大应力。假体高度的减少或中间植入物的偏移植入位置的使用降低了应力，但这种降低并不能补偿轴外负载带来的增加。

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