摘要
目的建立包含不同长度标准直径种植体的下颌骨三维有限元模型,分析不同长度种植体对即刻负载种植体骨界面应力应变分布的影响。方法采用薄层CT扫描下颌骨和自主开发的USIS软件建立直径4.1mm不同长度螺纹种植体即刻负载的三维有限元模型,用ANSYS软件分析长度分别为6、8、10、12、14mm的种植体,在垂直和颊舌向45°加载150N力时种植体骨界面的vonMises应力、应变值。结果随着种植体长度的增加,种植体骨界面的应力和应变值均呈下降趋势。垂直加载时,骨界面应力值在种植体长度从6mm增加到14mm分别下降14.9%、8.4%、11.3%和11.2%;其应变值分别下降23.4%、12.6%、12.7%和14.4%。颊舌向加载时,骨界面应力值在种植体长度从6mm增加到14mm分别下降19.23%、7.77%、5.2%和3%;其应变值分别下降18.2%、23.6%、10.5%和12.9%。种植体骨界面应力值在长度从6mm增加到8mm时下降最明显,尤其是颊舌向加载时。种植体骨界面应变值也是在长度从6mm增加到8mm及8mm增加到10mm时下降最明显。结论种植体长度的增加能降低骨界面应力和应变值,呈负相关关系;但只在长度从6mm增加到8mm时应力值降低才较明显。这提示临床上尽量不要采用长度为6mm的种植体,并应适当地选择足够长度的种植体。
Objective The three-dimensional finite element model of mandible with dental implants for immediate loading was established to analyze stress distribution of bone around the dental implants with different implant length.Method Five three-dimensional finite element models of thread dental implants with immediate loading were constructed using CT scanning and USIS（Universal Surgical Integration System）software developed by ourselves.Each of them included different length implants which was 6 mm、8 mm、10 mm、12 mm ,14 mm respectively. The values of Von Mises stress and strain at implant-bone interface were calculated with the software of ANSYS, when the dental implants were loaded with vertical,buccolingual force of 150 N. Result The values ofVon Mises stress and strain on the bone around implants all decreased with the length of dental implants increased. With the length increased from 6 mm to 8 mm, the value ofVon Mises stress at implant-bone interface reduced remarkably, especially when the dental implants were loaded with buccolingual force. However, when the length increased from 8 mm to 10 mm, from 10 mm to 12 mm and from 12 mm to 14 ram, the values ofVon Mises stress decreased unapparent. The value of Von Mises stress at implant-bone interface also reduced obviously with the length increased from 6 mm to 8 mm. Conclusions With the length of dental implants increased, the value of stress at implant-bone interface decreased,which showed a negative correlation in between. But the increase only appears apparently when the length of dental implants added from 6 mm to 8 mm. It suggests that we should choose sufficient longer implants in clinical treatment and avoid use the implant of 6mm length if possible.
出处
《医用生物力学》
EI
CAS
CSCD
2009年第4期295-299,共5页
Journal of Medical Biomechanics
基金
浙江省医学科技发展基金资助项目(2004B155)
关键词
牙种植体
即刻负载
有限元法
应力
长度
生物力学
Dental implants
Immediate loading
Finite element method
Stress
Length
Biomechanics
