植入位点不同对颧骨种植义齿种植体周骨应力分布影响的研究

Research on the influence of different implant site on the implant-bone-interface stress distribution in zygomatic implant denture

目的探讨植入位点不同时颧骨种植义齿种植体-骨界面的应力分布规律。方法计算机模拟建立上颌后牙区重度萎缩三维有限元模型,分别在第一前磨牙区、第二前磨牙区、第一磨牙区和第二磨牙区模拟颧骨种植义齿修复。进行垂直向、颊向30°和舌向30°加载100N,统计分析植入位点不同时颧骨种植义齿种植体-骨界面的应力。结果1)第一前磨牙区颧骨种植体颊侧暴露较多,与临床不符。2)上颌后牙区拉应力峰值比较:选择第二磨牙区植入时最大,第二前磨牙区次之,第一磨牙区最小。上颌后牙区压应力峰值比较:选择第二磨牙区植入时最大,第一磨牙区次之,第二前磨牙区最小。颧骨区拉应力及压应力峰值比较:选择第二前磨牙区植入时最大,第一磨牙区次之,第二磨牙区最小。结论选择第一磨牙区颧骨种植义齿修复较好。

Objective To probe the implant-bone-interface stress distribution of zygomatic implant denture concerning different implant sites.Methods Three-dimensional finite element model for severe atrophy maxillary posteriortooth area was established biomechanically in this study by computer technique and zygomatic implant was simulated into the model in the first-maxillary-premolar region,the second-maxillary-premolar region,the first-maxillary-molar region and the second-maxillary-molar region respectively.Vertical loading,buccal（30°） loading and lingual（30°） loading were preformed,100 N.Then these load cases were calculated and analyzed.Results 1）When the implant site was placed in the first-maxillary-premolar region,the buccal side of zygomatic implant exposed out of the bone and didn＇t meet the clinical request.2）As far as the tensile stress peak value in the maxillary posterior-tooth area was concerned,the highest value was recorded when the implant was placed in the second-maxillary-molar region,and then the medium value was recorded when the implant was placed in the second-maxillary-premolar region,and the smallest was recorded when the implant in the first-maxillary-molar region.As far as the compressive stress peak value in the maxillary posterior-tooth area was concerned,the highest value was recorded when the implant was placed in the second-maxillary-molar region,and then the medium was recorded when the implant was in the firstmaxillary-molar region,and the smallest value was presented when the implant was in the second-maxillary-premolar region.As far as the tensile and compressive stress peak values in the zygomatic area were concerned,the highest value was recorded when the implant was in the second-maxillary-premolar region,and then the medium value when the implant was in the first-maxillary-molar region,and the smallest when the implant was in the second-maxillary-molar region.Conclusion The first-maxillary-molar region is the best implant site of zygomatic implant denture.