Resumo

KALED, Gislaine Hoog et al. Endodontic retreatment: gutta-percha removal by three different techniques. RGO, Rev. gaúch. odontol. (Online) [online]. 2011, vol.59, n.1, pp. 103-108. ISSN 1981-8637.

OBJECTIVE: A comparative analysis was made to determine how efficiently three different techniques can remove endodontic fillings from root canals. METHODS: Thirty human extracted canines were prepared and filled with gutta-percha cones and Endofill (Dentsply-Maillefer, Petrópolis, RJ, Brazil) sealer, according to Tagger's technique. After mesiodistal and buccolingual radiographs, the canines were divided into three groups according to removal technique: Group I) Gates-Glidden burs associated with Flexofile (Maillefer, Ballaigues, Switzerland) files and a solvent; Group II) rotary Profile.04 (Maillefer, Ballaigues, Switzerland) system; and Group III) Gates-Glidden burs with solvent and rotary Profile.04 system. Once the fillings were removed, the teeth were once again radiographed. The radiographs before and after filling removal were scanned and the software AutoCAD was used to define and quantify the filled areas of the root canal before and after filling removal in the cervical, middle and apical thirds. RESULTS: Analysis of variance showed a statistically significant difference between the groups. The Tukey's test revealed a significant difference between Group I, which presented the best filling removal and Group II, which presented the worst filling removal. CONCLUSION: None of the techniques were capable of completely removing the fillings from the root canals. The apical third presented the greatest amount of leftover filling material, regardless of technique.

Palavras-chave : Endodontic; Gutta-percha; Retreatment.