Influence of Reconstructive Technique and Ferrule Height on Stress Distribution in Endodontically Treated Molars: A 3D Finite Element Analysis Study

Background: Endodontically treated teeth restored with a different type of restorative technique may experience a fracture. Accurate information about the stress distribution of endodontically treated lower first molars restored with different techniques is needed. This study was conducted to investigate and analyze the influence of reconstructive technique and ferrule effect on the stress distribution of endodontically treated molars (ETM). Methods: six three-dimensional finite elements (FE) models of a mandibular first molar were constructed (via MIMIC and Solid Works software). Based on the reconstructive methods used and the presence of a ferrule, Models have been divided into model 1 with a 2mm ferrule and model 2 without a ferrule. The models were restored with cast-made posts (A1 and A2), fiber posts (B1 and B2), and endocrown (C1 and C2). A vertical, oblique, and horizontal load of 200N was applied to each 3D model, and Von Mises stress was analyzed using ANSYS software. Results: all stress values were within physiological limits under all cases of load application. Areas of maximum stress concentration were located at the loading points of the crowns for all models except