不同跳跃间隙对前牙区盾构术种植系统的生物力学影响

Biomechanical Effects of Jumping Distance on Stress Distributions of Anterior Dental Implant with Socket-Shield Technique

目的研究跳跃间隙对盾构术种植系统的生物力学影响,为后续临床制定跳跃间隙标准提供参考。方法依据临床特征建立4组跳跃间隙分别为0、0.5、1、1.5 mm盾构术种植系统三维模型,赋予对应的材料参数,模拟在特定咬合工况下各组模型的应力峰值以及应力分布情况。结果跳跃间隙非0 mm,即种植体与保留根片不接触时,种植体和基台应力随着跳跃间隙的增加而增大,根片及牙周膜应力峰值随着跳跃间隙的增加而减小。跳跃间隙为0 mm时,种植体、基台、根片及牙周膜的应力峰值均达到最大,且远超其他组。结论跳跃间隙对盾构术种植系统具有明显生物力学影响,建议临床取较大跳跃间隙。根片外形边缘做圆角处理,且下缘尺寸不宜过小。

Objective To study the biomechanical effect of jumping distance on dental implants with socket-shield technique(SST),so as to provide references for clinical standards of jumping distance.Methods Based on clinical characteristics,four groups of three-dimensional(3D)SST implant system models with 0,0.5,1 and 1.5 mm jumping distance were established,and the corresponding material parameters were assigned.The peak stress and stress distributions on models were simulated under specific occlusal condition.Results When the jumping distance was non-zero,namely,the implant was not in contact with the retained root fragment,the stress of the implant and abutment increased with the increase of jumping distance,and the peak stress in root fragment and periodontal membrane decreased with the increase of jumping distance.When the jumping distance was zero,the peak stress of the implant,abutment,root fragment and periodontal membrane reached the maximum,far exceeding that of the other groups.Conclusions The jumping distance has a significant effect on the SST implant system.It is recommended to take a larger jumping distance in clinical practices.The edge of the root fragment should be rounded,and the size of the lower edge should not be too small.