Implant-Bone Interface Stress Distribution in Immediately Loaded Implants of Different Diameters: A Three-Dimensional Finite Element Analysis
Implant-Bone Interface Stress Distribution in Immediately Loaded Implants of Different Diameters: A Three-Dimensional Finite Element Analysis
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DOI：
10.1111/j.1532-849x.2009.00453.x
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发表时间：
2009-07-01
影响因子：
4
通讯作者：
Chen, Hong
中科院分区：
文献类型：
--
作者：
Ding, Xi;Zhu, Xing-Hao;Chen, Hong
目的：建立可即时加载种植体的下颌骨三维有限元模型，分析不同直径种植体周围骨内的应力分布情况。材料与方法：采用CT扫描和自行开发的通用外科集成系统软件，建立直径分别为3.3 mm、4.1 mm和4.8 mm的螺纹种植体(ITI、Strutaann、Swiss)3个下颌骨模型。结果：垂直载荷作用下，种植体应力集中在种植体颈部皮质骨的近端和远端，峰值分别为25.0、17.6和11.6 Mpa，峰值分别为3.3、4.1和4.8 mm，最大应变(5854、4903和4344 mU)位于种植体底部和螺纹周围的颊松质骨处。随着种植体直径的增大，应力应变显著降低(p<；0.05)。种植体颊舌面应力峰值出现在种植体颈周围皮质骨颊面处，直径分别为131.1、78.7和68.1 Mpa，最大应变出现在种植体颈附近松质骨颊面处，峰值分别为14、218、12、706和11,504µm。直径4.1 mm的种植体的应力明显低于直径3.3 mm的种植体(p<；0.05)，但与直径4.8 mm的种植体相比差异无统计学意义。结论：随着种植体直径的增大，种植体-骨界面上的应力和应变显著降低，尤其是当直径从3.3 mm增加到4.1 mm时更明显。对于长度为10 mm的即刻加载，种植体的直径应至少为4.1 mm，应避免或尽量减少对种植体的单轴加载。
Purpose: To establish a 3D finite element model of a mandible with dental implants for immediate loading and to analyze stress distribution in bone around implants of different diameters.Materials and Methods: Three mandible models, embedded with thread implants (ITI, Straumann, Switzerland) with diameters of 3.3, 4.1, and 4.8 mm, respectively, were developed using CT scanning and self-developed Universal Surgical Integration System software. The von Mises stress and strain of the implant-bone interface were calculated with the ANSYS software when implants were loaded with 150 N vertical or buccolingual forces.Results: When the implants were loaded with vertical force, the von Mises stress concentrated on the mesial and distal surfaces of cortical bone around the neck of implants, with peak values of 25.0, 17.6 and 11.6 MPa for 3.3, 4.1, and 4.8 mm diameters, respectively, while the maximum strains (5854, 4903, 4344 mu epsilon) were located on the buccal cancellous bone around the implant bottom and threads of implants. The stress and strain were significantly lower (p < 0.05) with the increased diameter of implant. When the implants were loaded with buccolingual force, the peak von Mises stress values occurred on the buccal surface of cortical bone around the implant neck, with values of 131.1, 78.7, and 68.1 MPa for 3.3, 4.1, and 4.8 mm diameters, respectively, while the maximum strains occurred on the buccal surface of cancellous bone adjacent to the implant neck, with peak values of 14,218, 12,706, and 11,504 mu m, respectively. The stress of the 4.1-mm diameter implants was significantly lower (p < 0.05) than those of 3.3-mm diameter implants, but not statistically different from that of the 4.8 mm implant.Conclusions: With an increase of implant diameter, stress and strain on the implant-bone interfaces significantly decreased, especially when the diameter increased from 3.3 to 4.1 mm. It appears that dental implants of 10 mm in length for immediate loading should be at least 4.1 mm in diameter, and uniaxial loading to dental implants should be avoided or minimized.