A comparison of the effects of two canal preparation techniques on root fracture susceptibility and fracture pattern
A comparison of the effects of two canal preparation techniques on root fracture susceptibility and fracture pattern
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DOI：
10.1097/01.don.0000140580.03121.61
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发表时间：
2005-04-01
影响因子：
4.2
通讯作者：
Messer, HH
中科院分区：
文献类型：
--
作者：
Sathorn, C;Palamara, JEA;Messer, HH
本研究的目的是确定旋转镍钛（NiTi）根管制备是否能增强根，以及有限元分析（FEA）模型是否可以预测断裂模式。从断裂力学的角度来看，结构缺陷、裂缝或管状不规则可能是影响根系断裂敏感性的主要因素，因为这些部位的应力会呈指数级放大。通过使用旋转镍钛将缺陷整合到光滑的圆管中，理论上可以加强根。25颗牙用手锉预备，25颗牙用旋转镍钛预备。封闭后，所有牙均承受载荷，直至骨折；记录负载和模式。以断裂根为材料建立了4个有限元模型。两种方法的骨折负荷无显著差异。旋转NiTi组中远端骨折发生率更高。四个有限元模型中的三个模型的应力模式与观察到的断裂模式相关良好。
The purpose of the study was to determine whether rotary nickel-titanium (NiTi) canal preparation strengthens roots, and whether the fracture pattern can be predicted by finite element analysis (FEA) models. From a fracture mechanics viewpoint, structural defects, cracks or canal irregularities are likely to play a major role in fracture susceptibility of the roots, because stresses can be exponentially amplified at these sites. By incorporating defects into a smooth round canal using rotary NiTi, theoretically the roots could be strengthened. 25 teeth were prepared using hand files and another 25 using rotary NiTi. After obturation, all teeth were subject to loading until fracture; load and patterns were recorded. Four FEA models were created from fractured roots. No significant difference of fracture load between the two techniques was found. Mesio-distal fracture occurred more often in the rotary NiTi group. Stress patterns in three of the four FEA models correlated well with the observed fracture patterns.