The ability of a plug of Coltosol to resist coronal microleakage in endodontically treated teeth. An ex vivo study.

Materials commonly used in endondontic treatment lack the ability to prevent microleakage into the root canal system. The aim of this study was to evaluate if adding a plug of Coltosol can prevent coronal microleackage in endodontically treated teeth by in vitro dye penetration method. In part one in this study 33 single canal human teeth was decoronized, mechanically prepared and obturated with Gutta-percha and AH-plus sealant using the cold lateral condensing technique. Specimens where randomly divided into three groups with 10 specimens in each group. Two teeth served as positive and one as negative control. Group 1 only GP/sealant was used, no plug was placed in the orifice. Specimens in group 2 and 3 where prepared with a 1 mm respectively 3 mm depth coronal cavity and the orifice-cavities was filled with Coltosol. Dye penetration was measured after immersed 30 days. In part two, eight teeth was prepared and canals were instrumented and filled in the same procedure as in part one. A 3 mm depth coronal cavity was prepared in four specimens in the remaining four teeth a 3 mm depth apical cavity was prepared. The cavities were filled with Coltosol. Dye penetration was measured after immersed 45 days and 90 days. No difference in leakage was observed after immersed in 30 and 45 days. A significant difference in leakage was observed after immersed 90 days (p=0.018), Specimens with a plug of Coltosol showed less dye penetration compared to the ones with only Gutta-percha and sealer