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首页> 外文期刊>Journal of Endodontics: Official Journal of American Association of Endodontists >Evaluation of two post core systems using two different methods (fracture strength test and a finite elemental stress analysis).
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Evaluation of two post core systems using two different methods (fracture strength test and a finite elemental stress analysis).

机译：使用两种不同的方法（断裂强度测试和有限元应力分析）评估两个柱后系统。

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摘要

The aim of this study was to compare a fiber composite laminate (FCL) post core and a conventional cast post core system by using two different methods. The first method was a conventional fracture strength test, and the second was a finite elemental stress-analysis method (FEM). For the conventional fracture strength test, 20 extracted, human upper, central incisors were used. The teeth were decoronated, treated endodontically, and restored with two post core systems. After embedding the samples in resin blocks, a loading force was applied to the teeth at a crosshead speed of 5 mm/ min at an angle of 45 degrees to the long axis of the tooth. The data were recorded, and the results were compared by using the Mann-Whitney U test. There was no statistically significant difference between the two post systems (p > 0.05). For FEM analysis, a pseudo three-dimensional model of a maxillary central incisor, theoretically restored with either a cast post or an FCL, was used. The analysis was performed by using the structural analysis program (SAP90). FEM analysis showed that stress was accumulated within the cast post core system, and transmission of stress to supportive structures and the tooth was low. This is an advantage for tooth and supporting tissues. When the FCL post core system was evaluated by FEM, the results indicated that this system transferred stress to supportive structures and the tooth while stress accumulation within the post system was low. This is an advantage for the restoration but disadvantage for the supporting tissues.
机译：这项研究的目的是通过使用两种不同的方法来比较纤维复合层压板（FCL）的后芯和常规的浇铸后芯系统。第一种方法是常规的断裂强度测试，第二种方法是有限元应力分析方法（FEM）。对于常规的断裂强度测试，使用了20颗人类上中切牙。对牙齿进行去装饰，牙髓治疗，并用两个后核心系统修复。将样品包埋在树脂块中后，以5 mm / min的十字头速度以与牙齿长轴成45度的角度向牙齿施加加载力。记录数据，并使用Mann-Whitney U检验比较结果。两种后期系统之间无统计学差异（p> 0.05）。为了进行有限元分析，使用了上颌中切牙的假三维模型，理论上可以用石膏柱或整形外科修复。使用结构分析程序（SAP90）进行分析。有限元分析表明，应力在铸件核心系统中积累，并且应力向支撑结构和牙齿的传递很小。这对于牙齿和支持组织是有利的。当通过FEM对FCL桩后核心系统进行评估时，结果表明该系统将应力转移到了支撑结构和牙齿上，而桩后系统内的应力累积较低。这对于修复是有利的，但是对于支撑组织是不利的。

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