Resumo

RITT, Andréa Seidl et al. Effectiveness evaluation of manual x rotary instrumentation during endodontic retreatment in root canals filled with gutta-percha and calcium hydroxide based-sealer. RFO UPF [online]. 2012, vol.17, n.1, pp. 55-59. ISSN 1413-4012.

Introduction: The aim of this study was to evaluate the effectiveness of the manual and mechanized instrumentation when removing gutta-percha and calcium hydroxide-based sealer from root canals. Methodology: Thirty palatal roots of upper molars were, ex vivo, evaluated as for the effectiveness of manual stainlesssteel and rotary nickel titanium (ProTaper UniversalTM, Dentsply-Maillefer, Ballaigues, Suitzerland) instruments on desobturation and reinstrumentation of root canals filled with gutta-percha and calcium hydroxide-based sealer (SealapexTM, SybronEndo Corporation, Orange, CA, EUA). The filling material was observed through an operatory microscope and the images photographed by digital camera. The AutoCAD 2004 program measured and calculated the remaining filling material by thirds and total root canal area. Results: For the manual technique, the Kruskal-Wallis test did not show any difference between cervical, medium and apical thirds (p = 0.253). For rotary technique, the Kruskal-Wallis test showed statistically significant difference between cervical, medium and apical thirds (p < 0.0001). The 5% Tukey's test identified higher amount of filling material on the third than on the cervical and medium apical. Conclusion: The remaining amount of gutta-percha and endodontic sealer, after both techniques, were similar. After manual technique, differences between radicular thirds were not observed; however, when rotary files were used, the apical third presented lower amount of filling materials than the cervical and medium thirds. Furthermore, the tested techniques were not capable to all gutta-percha and endodontic sealer from the root canals.

Palavras-chave : Endodontics; Retreatment; Root canal obturation.