不同设计新型钛合金根管桩修复下颌前磨牙残根的三维有限元分析  

Three-dimensional finite element analysis of different designs of residual posterior root restored with a new titanium alloy post

作　　者：王林霞[1] 苏畅[2] 王茂夏 孟玉坤[1] WANG Linxia;SU Chang;WANG Maoxia;MENG Yukun(Department of Prosthodontics,West China College of Stomatology, Sichuan University, Chengdu 610041, China;Capital Medical University School of Stomatology, Beijing 100050, China)

机构地区：[1]四川大学华西口腔医院修复科,四川成都610041 [2]首都医科大学附属北京口腔医院老年口腔科,北京100050

出　　处：《口腔疾病防治》2017年第9期569-574,共6页Journal of Prevention and Treatment for Stomatological Diseases

基　　金：成都市惠民工程项目(2013惠民工程-13)

摘　　要：目的采用三维有限元法比较不同直径、锥度新型钛合金根管桩修复下颌第二前磨牙残根的牙本质应力分布情况。方法以下颌第二前磨牙为建模牙位,利用CBCT获取图像数据,借助Mimics数据转换、Geomagic Studio图像处理技术、Creo/Parametric软件建立下颌第二前磨牙残根模型和不同直径、锥度根管桩模型,通过Abaqus三维有限元分析软件模拟载荷,分析牙颈部和根尖区的Von Mises应力分布情况。结果当直径相同时,桩锥度的变化对牙颈部应力峰值的影响无明确规律。当锥度一致时,根尖区应力峰值随直径的增大普遍呈先减小后增大的趋势。底端直径1 mm时牙颈部及根尖区应力峰值最小。结论直径对牙本质应力分布趋势的影响比锥度更为明显。Objective To compare the stress distribution of residual posterior root restored with a new titanium alloy post of different diameter and taper,and discuss the rational design of posterior tooth post by the three-dimensionalfinite element method.Methods Mandibular second premolar image data was obtained by CBCT,and the mandibularsecond premolar post models with different diameter and taper were established with the help of Mimics data conversion,Geomagic Studio image processing technology and Creo/Parametric software.Then Abaqus was used to simulatethe load condition of prosthesis and analyze the Von Mises stress of the cervical and apical regions.Results With thesame diameter,the influence of the different post tapers on the peak stress of the root cervical area was irregular.Whenthe taper was the same,the peak stress of the root apex area decreased firstly and then increased as the diameter increased.When the diameter was1mm,the peak stress of the root cervical and apex area was the lowest.ConclusionThe effect of diameter on the stress distribution of dentin is more important than that of taper.To select the reasonablediameter and taper of the post is helpful to reduce the peak stress of the root cervical and apex area.

关 键 词：根管桩 锥度 直径 应力分析 有限元方法 

分 类 号：R783.4[医药卫生—口腔医学]