This study aims to evaluate in vitro the influence of two chemical substances auxiliary to the endodontic treatment (5.25% sodium hypochlorite, 2% chlorhexidine gluconate) and the use of ethanol before the use of different adhesive systems (Clearfil SE Bond or Scotchbond Multi Purpose) on (1) bond strength and (2) adhesion longevity of fiber glass post model with composite resin to intrarradicular dentin. Besides that, it aims to check the real importance of the collagen fibers in this adhesion. The samples will be subjected to mechanical test extrusion by push out, after immersion in water in intervals of 1 day and 1 year. To control the hydrolysis collagen, part of the sample, corresponding to the period of 1 year, will be immersed in mineral oil. Subsequently, the mode of fracture will be examined by scanning electron microscopy and classified into: adhesive (resin dentin interface); or cohesive (in dentin, hybrid layer, resin or mixed). The results will be analyzed statistically.
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