单颗宽种植体与双种植体即刻负重用于下颌磨牙种植的三维有限元分析
3D finite element analysis of immediate loading of single wide versus double implants for replacing mandibular molar.
作者信息
Desai Shrikar R, Karthikeyan I, Gaddale Reetika
机构信息
Department of Periodontology and Implantology, H. K. E. Society's S. Nijalingappa Institute of Dental Sciences and Research, Chennai, Tamil Nadu, India.
Department of Periodontology and Implantology, Saveetha Dental College and Hospitals, Chennai, Tamil Nadu, India.
出版信息
J Indian Soc Periodontol. 2013 Nov;17(6):777-83. doi: 10.4103/0972-124X.124504.
PURPOSE
The purpose of this finite element study was to compare the stresses, strains, and displacements of double versus single implant in immediate loading for replacing mandibular molar.
MATERIALS AND METHODS
Two 3D FEM (finite element method) models were made to simulate implant designs. The first model used 5-mm-wide diameter implant to support a single molar crown. The second model used 3.75-3.75 double implant design. Anisotropic properties were assigned to bone model. Each model was analyzed with single force magnitude (100 N) in vertical axis.
RESULTS
This FEM study suggested that micromotion can be controlled better for double implants compared to single wide-diameter implants. The Von Mises stress for double implant showed 74.44% stress reduction compared to that of 5-mm implant. The Von Mises elastic strain was reduced by 61% for double implant compared to 5-mm implant.
CONCLUSION
Within the limitations of the study, when the mesiodistal space for artificial tooth is more than 12.5 mm, under immediate loading, the double implant support should be considered.
目的
本有限元研究的目的是比较在下颌磨牙即刻种植时，双种植体与单种植体的应力、应变和位移情况。
材料与方法
制作两个三维有限元模型以模拟种植体设计。第一个模型使用直径5毫米的种植体来支持单个磨牙冠。第二个模型采用3.75 - 3.75双种植体设计。为骨模型赋予各向异性特性。每个模型在垂直轴上以单一力大小（100牛）进行分析。
结果
本有限元研究表明，与单根大直径种植体相比，双种植体对微动的控制更好。双种植体的冯·米塞斯应力与5毫米种植体相比降低了74.44%。双种植体的冯·米塞斯弹性应变与5毫米种植体相比降低了61%。
结论
在本研究的局限性范围内，当人工牙的近远中空间大于12.5毫米时，在即刻种植的情况下，应考虑双种植体支持。
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