Comparative study of torsional and bending properties for six models of nickel-titanium root canal instruments with different cross-sections
Comparative study of torsional and bending properties for six models of nickel-titanium root canal instruments with different cross-sections
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DOI：
10.1016/j.joen.2005.08.012
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发表时间：
2006-04-01
影响因子：
4.2
通讯作者：
Eng, D
中科院分区：
文献类型：
--
作者：
Xu, XJ;Eng, M;Eng, D
采用有限元法研究了不同截面形状对六种市售镍钛根管器械力学性能的影响。考虑了NiTi合金的非线性力学特性。研究的六种根管器械为ProTaper、Hero642、Mtwo、ProFile、Quantec和NiTiflex。建立了这两种仪表的数学模型，并在等转矩条件下分析了它们的性能。ProTaper和Hero642型号达到了最低应力水平，使其具有最强的抗扭性，而NiTiflex型号最差。最大应力值和应力分布在一个模型中发现强烈影响的横截面形状。影响应力分布的因素包括横截面惯性、槽深、内芯面积、径向刃带和外周表面磨削。随着横截面内芯面积的增加，模型的抗扭性更强。
This study investigated the influence of cross-section profile on the mechanical behaviors of six commercial nickel-titanium (NiTi) root canal instruments using the finite element method. The nonlinear mechanical characteristics of the NiTi alloy were taken into account. The six root canal instruments studied were ProTaper, Hero642, Mtwo, ProFile, Quantec, and NiTiflex. Mathematical models for these instruments were constructed and their performances were analyzed under equal torque conditions. The ProTaper and Hero642 models achieved the lowest stress levels that made them the most torque-resistant while the NiTiflex model was the poorest. The maximum stress value and the stress distribution in a model were found strongly influenced by the cross-section profile. Factors affecting the stress distribution include the cross-sectional inertia, depth of the flute, area of the inner core, radial land, and peripheral surface ground. As the area of the inner core of the cross-section increased, the model was more torque-resistant.