Influence of dentin treatment in the reinforcement of weakened roots

Objective: The objective of this study was to evaluate, through the traction test, the influence of substances used for the treatment of the intraradicular dentine, in the adhesiveness of the light cured resin, in the reinforcement of weakened roots to receive metallic posts. Methods: They were used 40 roots of upper canine teeth that, after they be split up, they were included in acrylic resin, weakened, treated endodontically, filled with cement AH Plus and distributed in 4 groups in agreement with the substance used in the treatment of the dentine: Group I – distilled water; Group II - fosforic acid; Group III - EDTA; Group IV - EDTA and fosforic acid. The roots were reinforced with resin that was light cured through translucent fiber post and rehabilitated with prefabricated metallic posts cemented with Panavia F. The bodies-of-proof were submitted to the traction test in the Universal Machine Instron 4444. Results: The results obtained in the groups I (0.2452 kN), II (0.2265 kN), III (0.2662 kN) and IV (0.1980 KN) were analyzed and the test of Kruskal-Wallis showed there not to be significant difference among them (p>0.05). Conclusions: It concluded that the different types of substances used in this study in the treatment of the intraradicular dentine didn't interfere in the adhesiveness of the resin composed of the reinforcement intaradicular; however, the Group III presented the largest resistance values to the traction.