Resumo

PEREZ MARTINEZ, Aarón; GUERRERO IBARRA, Jorge  e  CELIS RIVAS, Luis. Effect of residual eugenol in root canals on adhesion of prefabricated light-transmitting endodontic posts cemented with composite resin. Rev. Odont. Mex [online]. 2014, vol.18, n.1, pp.14-18. ISSN 1870-199X.

It has been reported in scientific literature, that eugenol inhibits polymerization of resin-based cements; this fact can influence retention of posts cemented upon this material. Recently, prefabricated resin posts reinforced with clear fibers have been introduced in the dental environment. The target of these new posts is twofold: the light used for polymerization can be transmitted to the resin cementing medium through the aforementioned posts, contributing thus to esthetic reconstruction and incidence decrease of endodontically treated teeth fractures. It has been shown that the use of a comprehensive acid-etch technique for extended time periods cancels residual eugenol effects in root canals on the light-transmitting posts and the resin used to cement them. In the present study 10 extracted teeth were subjected to root canal treatment. These teeth were sealed with gutta-percha points (cones) and zinc oxide-eugenol cement. For this endeavor, lateral condensation technique was used. Root canals were prepared with low speed burrs (as found in the endodontic-post system), to be then cemented with resin following the technique recommended by the manufacturer. Traction forces were applied until achieving dislodgement, at which point retention was assessed. Results: Retention of all samples was reflected into graphs. It could be appreciated that retention values among groups were unequal; it can therefore be established that no statistically significant difference was encountered. Conclusion: Residual eugenol did not interfere in post adhesion when an extended time acid etch technique was followed.

Palavras-chave : Eugenol; retention; polymerization; etching acid; prefabricated posts; composite resin.