不同包绕度对桩冠箍效应影响的三维有限元分析  

The effect of various wrapping extent on ferrule effect in post crown by 3D-FEM

作　　者：张新春[1] 王焱[1] 米乃元[1] 樊瑜波[2] 李彦[1] 蒋文涛[2] 

机构地区：[1]中山大学光华口腔医学院,讲师广东510060 [2]四川大学建筑学院,教授四川610040

出　　处：《口腔颌面修复学杂志》2003年第2期84-86,共3页Chinese Journal of Prosthodontics

摘　　要：目的:研究桩冠修复中箍的不同包绕度与箍效应之间的相互关系及影响。方法:建立上颌中切牙烤瓷核桩冠三维有限元模型,模拟箍效应的4种包绕形式,通过三维有限元方法分析牙本质受力情况。结果:① 根管口周围余留牙本质壁完整,牙本质应力分布最好。② 仅余留唇侧牙体时,颈部牙本质应力水平明显升高。结论:随着箍包绕牙体壁的减少,箍效应有所降低,但保留唇舌侧牙体和仅保留舌侧牙体都可获得一定的箍效应。Objective: To investigate the relation and the effect of various wrapping extent on ferrule effect in postcrown. Methods: The model of a maxillary central incisor restored with post and PFM crown was built by three-dimensionalfinite element methods. By imitating four wrapping extent of ferrule effect, the dentin stress was analyzed by 3D-FEM.Results: ①There was the best stress distribution when the wrapping dentin wall was integrated.②The cervical stressincreased significantly when only facial wall existed. Conclusions: The ferrule effect declined with the reduction offerrule wrapping dentin wall. It can maintain ferrule effect by retaining the residual labial and palatal walls or only palataldentin wall.

关 键 词：包绕度 箍效应 影响 三维有限元 关系 牙应力 桩冠修复 桩核技术 

分 类 号：R783.6[医药卫生—口腔医学]