中国实用口腔科杂志2018，Vol.11Issue(1)：24-28,5.DOI:10.19538/j.kq.2018.01.005
种植体根尖部与上颌窦底皮质骨的关系对上颌后牙区种植影响的三维有限元分析
Effects of the relationship between implant tip and sinus floor cortical bone on posterior maxilla implantation: a three-dimensional finite element analysis
摘要
Abstract
Objective To evaluate the biomechanical influence of the relationship between implant tip and sinus floor cortical bone on posterior maxilla implantation by means of 3-dimensional (3-D) finite element (FE) analysis.Methods Six 3-D FE models (M1 to M6) of standard implants and posterior maxillary region were constructed using CAD software.The thickness of both crestal cortical bone and sinus floor cortical bone were 1mm;according to different heights of the alveolar bone,the relationship between implant tip and sinus floor cortical bone was as follows.M 1:the implant tip just broke through sinus cortical bone (the upper surface of sinus cortical bone and the apical surface of the implant were at the same level);M2:the implant tip broke through half the thickness of sinus floor cortical bone;M3:the implant tip just made contact with the lower surface of sinus floor cortical bone;for the remaining models,the implant tips were 1mm,2mm and 3mm apart from sinus floor,respectively.An inclined force of 129N was applied under immediate loading and conventional loading.The maximum yon Mises stress,stress distribution,implant displacement and resonance frequencies were calculated using CAD software.Results Except the M 1 under immediate loading,the maximum yon Mises stress of all models were concentrated on the surface of the crestal cortical bone around the implant neck.When the implant tip broke into or through sinus floor cortical bone,the maximum yon Mises stress of crestal cortical bone reduced while that of sinus cortical bone increased,and the occlusional resonance frequencies of implants increased significantly while horizontal frequencies decreased,whether under immediate loading or conventional loading.Under immediate laoding,the maximum displacement of implant,especially the maximum displacement of the implant tip,was lower than the other models when the implant tip broke into or through the sinus cortical bone.However,the maximum displacements of both implant neck and tip were hardly affected by the association between implant tip or sinus floor cortical bone under conventional loading.Conclusion The association between implant tip and sinus floor cortical bone has effects both on stress distribution of the bone tissues around implant and on the maximum displacement and resonance frequencies of implants.Making the implant tip break into or through the sinus floor cortical bone (bi-cortical anchorage) is beneficial to improve the stress distribution and reduce the maximum displacement of implant,increasing the stability of the implant,especially under immediate loading.关键词
牙种植体/上颌窦/有限元分析/应力分布/共振频率分析/皮质骨Key words
dental implants/maxillary sinus/finite element analysis/stress distribution/resonance frequency analysis/cortical bone分类
医药卫生引用本文复制引用
薛燕青,毓天昊,郑添予,韩童童,阎旭..种植体根尖部与上颌窦底皮质骨的关系对上颌后牙区种植影响的三维有限元分析[J].中国实用口腔科杂志,2018,11(1):24-28,5.基金项目
辽宁省自然科学基金(2015020465) （2015020465）
