根管弯曲参数对镍钛根管器械应力分布影响的有限元研究  

Finite element analysis of nickel-titanium rotary instrument in curved root canals with different parameters

作　　者：陈露[1] 陈造[1] 吴补领[2] 

机构地区：[1]广东省中山市中医院,主治医师硕士生广东528400 [2]南方医科大学口腔医学院,主任医师教授广东510515

出　　处：《中华老年口腔医学杂志》2014年第5期273-276,共4页Chinese Journal of Geriatric Dentistry

摘　　要：目的:建立模拟机用镍钛根管器械进行根管预备的三维有限元模型,研究根管弯曲参数对镍钛根管器械应力分布产生的影响,探讨有限元分析法研究镍钛根管器械机械性能的可靠性及其临床意义。方法:用Micro-CT扫描并建立ProTaper Universal F2三维有限元模型。用Hyperworks 10.0建立不同弯曲半径(2mm、5mm)、弯曲角度(30°、45°)和弯曲部位(根中、根尖)的八种简化弯曲根管的几何和有限元模型。用ANSYS 12.1研究器械在旋转进入八种弯曲根管底部的应力分布云图及特点,并对三个弯曲参数进行敏感性分析。结果:器械在根管8的应力最大(1426.0Mpa),在根管1的应力最小(651.2Mpa)。弯曲半径导致器械应力变化权重最大(44.9%)。结论:本研究证实了有限元分析法在研究镍钛根管器械机械性能方面的有用性。根管的弯曲半径是决定器械应力分布最为关键的参数。在临床急弯根管预备中应尽量使用小号器械。Objective：To create a finite element（FE） model simulating a Ni-Ti rotary instrument root canal preparation for evaluating the effects of the canal shape on the stress distribution generated in the instrument to demonstrate the clinic usefulness of the FE method in improving the knowledge of the mechanical behavior of Ni-Ti rotary instruments.Methods：ProTaper Universal F2 was scanned in a micro-CT scanner and FEM was reproduced. The simple geometry models and FEM of eight canals with different radius（2mm,5mm）,angel（30°,45°） and position（middle, tip） were reproduced using Hyperworks 10.0. The stresses on the instrument during simulated shaping of 8 root canals were analyzed numerically using ANSYS 12.1.Sensitivity of three parameters was analysed. Results：The highest stress level was produced in canal eight（1426.0Mpa） and the lowest stress level was produced in canal one（651.2Mpa）.The radius of the canal weighted dominately for the change of stress state. Conclusions： It confirmed the usefulness of FEA method in improving the knowledge of the mechanical behaviour of Nickel-Titanium endodontic instruments. The radius of the canal curvature is the most critical parameter that determines the stress level in instrumentation. The instruments with smaller diameters are recommended for the sharp curved canals.

关 键 词：镍钛根管器械 弯曲根管 应力分布 有限元分析 

分 类 号：R781.05[医药卫生—口腔医学]