The aim of this study will be to evaluate the adhesion of individualized glass fiber retainers with incrementally composite resin inside the root canal under the effect of extrusion (push-out), before and after artificial aging, through a randomized controlled experimental study. A hundred bovine incisors will be selected, treated endodontically and seccionated, their canals will be cleared and randomly separated among the groups of treatment to the glass fiber retainers cementation: G1: retainer + Scoth Bond Multi-Purpose (SBMP) + dual cure resin cement RelyX ARC (ARC); G2: individualized retainer by relining (Filtek Z250) + SBMP + ARC; G3: individualized retainer by increments (Filtek Z250) + SBMP; G4: individualized retainer by increments (Filtek Bulk Fill) + SBMP; G5: individualized post by increments (Filtek Bulk Fill Flow) + SBMP. Each group will contain 20 representative samples (10 teeth to immediate testing and 10 teeth to testing after artificial aging). The 10 samples to immediate testing will be submitted the effect of extrusion (push-out) in a universal testing machine and after the artificial aging process, the other 10 samples will also be submitted to the same test. After the push-out test, the samples will be analyzed in light microscope to classify the failure patterns. The results will be submitted to appropriate statistical analysis. Through the pattern of failure and images of the specimes from Scanning Electronic Microscopy descriptive qualitative data will be obtained.
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