Rajagopal Shruthi, Sharma Sonali
Department of Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals,Saveetha Institute of Medical and Technical Sciences (SIMATS) Saveetha University, Chennai, IND.
Cureus. 2024 Jul 3;16(7):e63719. doi: 10.7759/cureus.63719. eCollection 2024 Jul.
Introduction The preservation of tooth structure during cavity preparation is crucial for maintaining tooth strength and longevity of restorations. The biomechanical behavior of teeth, especially those with mesio-occlusal-distal (MOD) cavity preparations, is significantly affected by the extent of cavity preparation and the type of restorative treatment employed. The aim of the current study was to evaluate and analyze the stress distribution seen in the mandibular molar with MOD cavity when restored with transverse post, using finite element analysis (FEA). Materials and methodology FEA was utilized to evaluate stress distribution in an endodontically treated mandibular first molar with MOD cavity preparation, restored using a transverse post and composite restoration. Three-dimensional models incorporating the tooth and the surrounding structures, along with the transverse post and composite restoration, were constructed based on known biomechanical properties. After meshing the models, loads were defined on the buccal and lingual cusps with a constant value of 600N and at an angle of 45 degrees. Preprocessing involved model preparation followed by postprocessing to obtain results representing the degree and type of stress distribution. Results FEA simulations revealed the distribution of stress within the tooth structure under functional occlusal forces. The transverse post system effectively reinforced the tooth by deflecting incident forces and providing uniform stress distribution. von Mises stresses were analyzed to assess the likelihood of material failure. The distribution of the stress in the restored tooth model was comparable to that seen in the intact model. Conclusion Transverse post along with composite restoration provides a conservative and cost-effective alternative to full coverage crowns while providing a functional and aesthetic outcome. Further research and clinical studies are warranted to validate these findings and optimize the clinical application of transverse post systems in restorative dentistry.
引言 在窝洞预备过程中保留牙体组织对于维持牙齿强度和修复体的使用寿命至关重要。牙齿的生物力学行为，尤其是那些有近中-咬合-远中（MOD）窝洞预备的牙齿，会受到窝洞预备范围和所采用的修复治疗类型的显著影响。本研究的目的是使用有限元分析（FEA）评估和分析用横向桩修复的MOD窝洞下颌磨牙中的应力分布。材料与方法 利用有限元分析来评估经根管治疗的有MOD窝洞预备的下颌第一磨牙在用横向桩和复合树脂修复后的应力分布。基于已知的生物力学特性构建包含牙齿及其周围结构以及横向桩和复合树脂修复体的三维模型。对模型进行网格划分后，在颊尖和舌尖上定义恒定值为600N且角度为45度的载荷。预处理包括模型准备，随后进行后处理以获得代表应力分布程度和类型的结果。结果 有限元分析模拟揭示了在功能性咬合力量作用下牙体结构内的应力分布。横向桩系统通过使入射力偏转并提供均匀的应力分布有效地增强了牙齿。分析了冯·米塞斯应力以评估材料失效的可能性。修复后牙齿模型中的应力分布与完整模型中的应力分布相当。结论 横向桩与复合树脂修复相结合，在提供功能和美学效果的同时，为全冠修复提供了一种保守且经济高效的替代方案。有必要进行进一步的研究和临床研究来验证这些发现并优化横向桩系统在修复牙科中的临床应用。
