Resumo

KUGA, Milton Carlos et al. Re-instrumentation influence in the apical preparation after principal guttapercha point placement in apical marginal leakage. RFO UPF [online]. 2010, vol.15, n.1, pp. 30-34. ISSN 1413-4012.

The aim of this study was to evaluate in vitro the apical leakage after the apical re-preparation and replacement of the principal gutta-percha point plus endodontic sealer (Sealer 26TM). Sixty extracted human canines were prepared by using a step back technique up to size 50 K type file apically. At each change of instrument the canals were irrigated with distilled water. After that step, the external surface roots were coated and subdivided into six groups with ten roots each: I - single gutta percha point technique; II - lateral condensation and III - hybrid technique. The IV, V and VI groups were similar to others groups but after to place the principal gutta percha point, it was removed, re-prepared up to size 60K file and in sequence replaced the principal gutta percha point and the root canal filling finished. The specimens were immersed in 2% Rhodamine BTM for 7 days at 37 oC. The apical leakage was measured by Image ToolsTM program. With Kruskal Wallis test statistical analysis showed that there was no significant difference between the techniques (p > 0.05).

Palavras-chave : Root canal obturation; Root canal preparation; Gutta-percha; Dental leakage.