纤维桩核冠修复弯曲牙根的三维有限元分析  

3D Finite element analysis of fiber post-core restorations for curved root

作　　者：马新扬[1] 王伟峰[1] 王方[1] 

机构地区：[1]西安医学院口腔修复科教研室,陕西西安710021

出　　处：《牙体牙髓牙周病学杂志》2013年第9期578-580,共3页Chinese Journal of Conservative Dentistry

摘　　要：目的:通过建立纤维桩核冠修复上颌中切牙弯曲牙根,分析弯曲牙根和桩核冠的应力分布及影响因素。方法:应用Micro CT断层扫描技术并结合Minics、Geomagic和UG软件建立纤维桩核冠修复弯曲牙根的三维实体模型,并将实体模型导入ABAQUS有限元分析软件中构建三维有限元模型。通过模拟临床咬合加载100 N静态载荷,分析桩核冠及牙根的应力分布。结果:对三维有限元模型施加咬合力后,应力主要分布在全瓷冠承受咬合力区域、全瓷冠颈缘以及牙根弯曲部位,而在纤维桩树脂核及牙根近中1/3部位应力分布较小。结论:使用纤维桩核冠修复弯曲牙根时,应尽量多保留弯曲部位的牙本质;同时应保证全瓷修复体颈缘部位有一定的瓷层厚度。AIM： To analysis the stress distribution of curved root of maxillary central incisor and fiber post core using 3D finite element method. METHODS： 3D finite element models with alveolar bone, dentin, fiber post- core, all-ceramic crown were constructed with Micro CT and Minics, Geomagic, UG softwares. 100 N static load was applied for occlusion simulation, the stress distribution was analyzed by ABAQUS software. RESULTS ： The stress was mainly distributed on the margin and biting area of all-ceramic crown as well as the region of curved root, but the value of the stress on fiber post-core and one-third of mesial root region was less. CONCLUSION ： More dentin on the re gion of curved root should be retained and the margin thickness of all-ceramic restorations should be taken into account in fiber post-core repair.

关 键 词：弯曲牙根 纤维桩 有限元分析 

分 类 号：R783.3[医药卫生—口腔医学]