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The influence of the flexural modulus of prefabricated posts on the fracture resistance of endodontically treated teeth is unclear. The purpose of this invitro study was to evaluate the influence of post material and post diameter on the fracture resistance of endodontically treated mandibular premolars. In addition, the influence of tooth substance loss was evaluated by comparing 1 with 2 residual dentinal walls. Sixty-four extracted mandibular first premolars were endodontically treated and divided into 8 test groups (n=8) based on t