Generated stresses finite element analysis of restored endodontically treated molar using single versus double titanium posts : Abbreviated title: generated stresses finite element analysis of restored endodontically treated molar.

When teeth are extensively injured, the restoration of Endodontically Treated Teeth (ETT) presents substantial obstacles. For these restorations to be successful over the long term, it is essential to ensure appropriate retention and resistance to fracture. The purpose of this study is to use 3D finite element analysis (FEA) to assess the stress distribution in severely damaged ETT following the installation of single versus double titanium posts. Cone beam computed tomography (CBCT) was used to scan an undamaged human mandibular first molar. Three post designs were examined; Model D received one distal post, Model DMB had two posts; distal and mesiobuccal posts, and Model DML included two posts; distal and mesiolingual posts. FEA was used to examine stress distribution and evaluate maximum stress at six areas: occlusal surface, finish line, furcation area, and along the root canal length at 7 mm, 5 mm, and 3 mm from the apex. Model D recorded the highest stress values at all assessed locations, while Model DML reported the least stress values. Model DMB showed intermediate levels of stress. When compared to a single post, the use of two posts considerably reduced stress concentrations, especially when inserted in the distal and mesiolingual canals. FEA proved to be a useful tool in evaluating and directing clinical decisions for repairing ETT. Occlusal surface followed by finish line locations reported the highest stress values in all tested models.