Reinforcement of simulated immature roots restored with composite resin, mineral trioxide aggregate, gutta-percha, or a fiber post after thermocycling.

Introduction: The purpose of this study was to evaluate the fracture resistance after thermocycling of simulated immature teeth restored with composite, a fiber post, mineral trioxide aggregate (MTA), or gutta-percha.

Methods: Eighty-four primary bovine mandibular incisors were divided into 7 groups (n = 12). Negative controls received no treatment.