ObjectivesThis study aimed to evaluate, using three-dimensional (3D) finite element analysis (FEA), the stress distribution within endodontically treated (RCT), periapical lesioned mandibular premolar teeth restored with fiber posts and metal-supported porcelain crowns under masticatory forces.Material and MethodsTwo FEA models representing different clinical scenarios were developed: a healthy mandibular premolar tooth (Model 1) and an RCT premolar tooth with a periapical lesion, restored with a fiber post and a metal-supported porcelain crown (Model 2). A static load of 300 N was applied to the occlusal surface at a 45° angle to the longitudinal axis of the tooth. Maximum equivalent stresses on dental tissues, post material, surrounding bone structures, and the periapical lesion were calculated and visualized according to the Von Mises criterion.ResultsFunctional loading concentrated stresses predominantly at the buccal cervical region in both models. However, the fiber post model exhibited relatively higher stress values and greater deformation compared to the intact tooth, particularly at the cervical area and post-dentin interface.ConclusionIt has been determined that the use of fibre posts in the restoration of teeth with periapical lesions leads to a concentration of stress distribution in the cervical region and at the post-dentine interface. Therefore, the resulting biomechanical load transfer mechanisms should be evaluated through an analytical and systematic clinical assessment
Kırmalı et al. (Thu,) studied this question.