University of Naples Federico II, School of Dentistry, Italy.
Dent Mater. 2011 Dec;27(12):1285-94. doi: 10.1016/j.dental.2011.09.009. Epub 2011 Oct 13.
The aim was to evaluate the stress distribution, comparing an anterior sound tooth with post-endodontic restored teeth under mechanical loading.
A three-dimensional finite element analysis was performed based on micro-CT scan images of a maxillary canine. Twelve models with different crown properties and post-configurations were simulated. The model of the maxillary sound canine was also created and investigated. A load of 50N was applied at a 63° angle with respect to the longitudinal axis of the tooth on the palatal surface of the crown. Principal stresses were registered. Numerical FEA results were statistically analyzed to show the influence of post shape and crown materials.
All analyzed models (M1-M12) exhibited a high stress gradient, due to different material stiffnesses present at the various interfaces. The most uniform mechanical behavior of the investigated models, very similar to sound tooth, was the combination of a composite crown and a cylindrical or conical fiber-glass post.
The results of this study facilitate informed clinical choice between possible material combinations in restorative procedures of endodontically treated anterior teeth.
本研究旨在评估在机械加载下，与牙髓治疗后的修复牙相比，前牙完整牙体在受力时的应力分布情况。
本研究基于上颌尖牙的 micro-CT 扫描图像进行了三维有限元分析。模拟了 12 种不同牙冠特性和桩核配置的模型。同时还建立和研究了上颌完整尖牙的模型。在牙冠腭面，以 63°的角度向牙长轴方向施加 50N 的载荷。记录主应力。对数值有限元分析结果进行统计学分析，以显示桩核形状和牙冠材料的影响。
由于不同界面存在不同的材料刚度，所有分析的模型（M1-M12）均表现出高的应力梯度。在所研究的模型中，复合材料牙冠和圆柱或锥形玻璃纤维桩的组合表现出非常类似于完整牙的最均匀的机械行为。
本研究的结果有助于在牙髓治疗后的前牙修复治疗中，针对可能的材料组合做出明智的临床选择。
