反支撑形螺纹种植体即刻负载时应力分布的三维有限元分析  

Analysis of the biomechanics stress distribution of the reverse buttress thread implant under Immediate loading:A three dimensional finite element study

作　　者：王维丽[1] 马洁[2] 李鑫[2] 宫琳[1] 

机构地区：[1]航天中心医院北京大学航天临床医学院口腔科,副主任医师北京100049 [2]锦州医科大学航天中心医院研究生培养基地,硕士生北京100049

出　　处：《口腔颌面修复学杂志》2016年第4期211-215,共5页Chinese Journal of Prosthodontics

基　　金：航天科工集团科研基金(项目编号:YN201424)

摘　　要：目的:利用三维有限元模型,探讨圆柱状反支撑形螺纹种植体螺纹形态变化对周围骨组织应力大小的影响,为临床设计和选择最佳的种植体螺纹参数提供理论依据。方法:利用包含圆柱状反支撑形螺纹种植体的颌骨三维有限元模型,分别设定螺纹宽度恒定(W=0.2)螺纹齿高(H)变化范围为0.2-0.6mm,或螺纹齿高恒定(H=0.4)螺纹宽度(W)范围为0.1-0.4mm。在种植体正中分别加载垂直向100N和颊舌向45°50N的作用力进行分析。观察H和W变化对颌骨平均应力Von-Mises峰值的影响。结果:即刻负载时,垂直向加载(F1)时,齿高及宽度变化时种植体Von-Mises应力峰值增幅分别为68.39%和20.90%;侧向加载(F2)时,种植体应力峰值变化增幅为42.28%和32.51%;结合两种作用力,当螺纹宽度恒定,齿高为0.3-0.5mm时,即刻负载情况下种植体对颌骨产生的应力峰值相对较小;齿高恒定,宽度设计为0.1-0.3mm时,种植体对颌骨产生的应力峰值相对较小。结论:在生物力学方面研究表示,圆柱状反支撑形螺纹种植体最佳的螺纹设计为螺纹齿高在0.3-0.5mm之间,螺纹宽度在0.1-0.3之间;相对于种植体螺纹宽度而言种植体螺纹齿高对应力分布影响更大,种植体螺纹设计时更应重视齿高的设计。Objective： In order to provide theoretical basis for clinical implant design and selection of the best implant thread parameters, we discussed the influence of the changes of the implant thread on the stress of the surrounding bone by using the three dimensional finite element model. Methods： Using three dimensional finite element model of jaw containing the reverse buttress screw implant, we set the thread width constant （W=0.2）, the thread depth variation range of 0.2-0.6mm, or the H （H=0.4） thread width （W） range of 0.1-0.4mm.Analysis of the forces acting on the 100N axial load and the 50N 45° buccolingual load at the middle of the implant. To observe the effect of H and W changes on the average stress Von-Mises peak of jaw. Results： In immediate loading, under axial load （F 1）, The amplification of Von-Mises stress in the implant was 68.39%and 20.90% respectively, when the thread depth and width changes; Under buccolingual load （F2）, the increase of the peak stress of the implant was 42.28% and 32.51%. Combined with the two kinds of forces, When the thread width is constant, the thread depth is 0.3-0.5mm, the stress peak value of the implant is relatively small; and the thread depth is constant, the thread width is 0.1-0.3mm. Conclusions： When the thread depth is from 0.3mm to 0.5mm and the thread width is from 0.1mm to 0.3mm.The Max EQV stress in jaw bones reaches the minimal value and the optimal design of thread parameters should be selected from these range by biomechanical consideration. Compared with the thread width of the implant, the thread depth played more important roles in affecting bone stresses.

关 键 词：种植体 螺纹形态 即刻负载 三维有限元分析 

分 类 号：R783.6[医药卫生—口腔医学]