Effectiveness of two NiTi rotary instruments and a hand file for removing gutta-percha in severely curved root canals during retreatment an ex vivo study Aim: To evaluate the effectiveness of hand files, proTaper & R-Endo rotary instruments in removing GP from curved canals Methodology .
100 single rooted teeth Endofill + GP Sealer 26 + GP
Conclusion : A photomicrographic method was more effective than the radiographic method to evaluate filling debris. There was no significant difference between the filling materials in terms of their removal. K3 and ProTaper were more efficient than manual instrumentation.
Results: Significant differences between radiograph and photomicrographic evaluation methods. No significant differences in removal between filling materials Manual instrumentation left more debris on the canal walls compared to PtoTaper.
References Siqueira JF, Jr. Aetiology of root canal treatment failure : why well treated teeth can fail (Literature review ). International Endodontic Journal ,34 ,1-10,2001 R.Gergi & C. Sabbagh (2007).Effectiveness of two NiTi rotary instruments and a hand file for removing gutta-percha in severely curved root canals during retreatment an ex vivo study. International Endodontic Journal, 40,532-537. A. C. de CarvalhoMaciel, M. F. ZaccaroScelza (2006) .Efficacy of automated versus hand instrumentation during root canal retreatment: an ex vivo study. International Endodontic Journal 39 (10), 779–784.