不同跨度联冠夹板修复上颌切牙的三维有限元分析  

Three dimensional finite element analysis of maxillary incisors restored by the combined crowns of different span

作　　者：张理红 钟先瑜 徐佳蕊 刘昌权[1] 罗岷[1] 龙刚[3] 田丽玛 

机构地区：[1]四川省宜宾卫生学校口腔教研室,四川宜宾644000 [2]四川大学华西口腔医学院 [3]成都市第三人民医院口腔科 [4]宜宾市德仁口腔门诊部

出　　处：《广东牙病防治》2015年第10期514-517,共4页Journal of Dental Prevention and Treatment

基　　金：宜宾市科技局重点科技计划研究基金(2013SF021)

摘　　要：目的探讨不同跨度联冠夹板修复上颌切牙在牙槽骨吸收状况下的应力状况。方法采用Micro-CT扫描4颗离体上颌切牙,通过Mimics 10.01软件建立三维有限元模型,模拟基牙牙周支持骨丧失1/3的临床情况。将数据导入Ansys Workbench 11.0软件中,分析单颗牙、两牙联冠、四牙联冠舌侧加载角度分别为5°、10°、15°、20°、25°、30°、35°、40°、45°时基牙及牙槽骨的应力情况并测定其Von Mises应力值。结果两牙联冠修复在所有加载角度下基牙和支持牙槽骨所受应力值均小于单冠修复下的应力值,四牙联冠修复时所受应力更小。结论上颌切牙不同跨度联冠修复基牙及支持组织的应力状态存在差别,理论上,联冠能够起到保护基牙牙周支持组织作用,跨度大的联冠修复应力更小。Objective To investigate the stress distribution of maxillary incisors which is periodontally compromised and restorated by the combined crowns of different span. Methods Four maxillary incisors were scanned by Micro-CT and constructed into three dimensional finite element models by Mimics 10. 01 software under the simulate clinical situation with 1/3 of cervical alveolar supporting bone loss. Models were divided into three groups according to the design of single tooth, two-teeth combined, four-teeth combined crowns, each group were divided into subgroups in the light of the loading angle of the crown to the lingual surface of the incisal edge, with angles of 5°,10°, 15°, 20°, 25°, 30°, 35°,40°, 45°, respectively. Then the data of each group were imported into Ansys Workbench 11. 0 software to obtain the Von Mises values. Results The stress of the teeth and the alveolar bone with restoration of two-tooth combined crowns were lower than that with single tooth under all angles, which were even lower for four-teeth combined crowns. Conclusion The type of crown for the maxillary incisors influences the stress on the teeth and the supporting alveolar bone.Combined crowns can effectively reduce stress of teeth and the alveolar bone through the mechanism of periodontal splints,the longer the span of the combined crowns, the lower the stress.

关 键 词：联冠 三维有限元 上颌切牙 牙周夹板 

分 类 号：R783.3[医药卫生—口腔医学]