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the medium term. Protective nightguards are recommended. To evaluate the effects of post length, post material, and substance loss on the fracture resistance of endodontically treated mandibular premolars. A total of 96 extracted human mandibular first premolars were endodontically treated and divided into 12 test groups (n = 8 each) based on the number of residual walls (one/two), post material (glass-fiber/titanium), and post length (5 mm, 7.5 mm, and 10 mm). After luting the posts, specimens received a composite resin core and a cro