E. Klein-Franke , E. Youssef , L. Keilig , C. Bourauel , I. Dörsam
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引用次数: 0
摘要
背景这项研究的目的是确定在 1 N 和 100 N 负荷下使用不同的封闭材料对上中切牙进行根管充填并结合根尖切除术的效果。方法根据 CBCT 扫描结果制作了上中切牙模型。根据 CBCT 扫描结果,制作了一个上中切牙模型,并对模型进行了修改,以模拟不同的临床情况:根管治疗、两种不同长度的根尖切除术和不同的封闭方案,以及外伤后不成熟的牙根形成。在每个模型中,牙齿分别承受 1 N 和 100 N 的负荷,并测量牙槽骨和牙齿的峰值 Von Mises 应力、牙周韧带的弹性应变以及牙齿的旋转和位移。结论根尖周手术计划或比较有限元分析时,需要考虑到根尖周角度或加载方向对所有测量值的重大影响。在这项研究中,未成熟牙根的应力值最高,达到牙本质屈服强度的一半。
Periapical surgery and different root obturation protocols for upper central incisor: A finite elements analysis
Background
The aim of this study was to determine the effect of root canal filling using different obturation materials combined with apicoectomy in upper central incisors under loading with 1 N and 100 N. The effect of incomplete root formation was also investigated.
Methods
Based on a CBCT-scan, a model of an upper central incisor was created. The model was altered to simulate different clinical situations: root canal treatment, apicoectomy at two different lengths and with different obturation protocols, and immature root formation after trauma. In each model the tooth was loaded with 1 and 100 N, and peak Von Mises stress of bone and tooth, elastic strain of the periodontal ligament, as well as rotation and displacement of the tooth were measured.
Results
Periapical surgery increases stress in dentin and the surrounding bone. Different obturation materials only produce minor differences in a coronally intact tooth.
Conclusions
Interincisal angle or loading direction strongly affects all measured values and needs to be considered when planning periapical surgery or comparing finite element analysis. Immature roots show the highest stress values in this study, reaching half the yield strength of dentine.
期刊介绍:
Annals of Anatomy publish peer reviewed original articles as well as brief review articles. The journal is open to original papers covering a link between anatomy and areas such as
•molecular biology,
•cell biology
•reproductive biology
•immunobiology
•developmental biology, neurobiology
•embryology as well as
•neuroanatomy
•neuroimmunology
•clinical anatomy
•comparative anatomy
•modern imaging techniques
•evolution, and especially also
•aging