Comparison of the efficacy of nickel-titanium rotary systems with or without the retreatment instruments in the removal of gutta-percha in the apical third
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Abstract
Background: The purpose of this study was to compare the efficacy of nickel-titanium rotary systems with or without
the retreatment instruments in the removal of gutta-percha from the apical third.
Methods: The systems compared were as follows: ProTaper Universal (PT), ProTaper Universal Retreatment (PTr),
Mtwo (M2) and Mtwo Retreatment (M2r). Sixty extracted mandibular incisors were treated with a crown-down technique
and filled with gutta-percha and sealer. The apical diameter was standardized in 0.30 mm, 1 mm from the apex. The
teeth were distributed into 4 experimental groups: PT, PTr, M2 and M2r. In PTr and M2r groups, filling materials were
removed by PTr/M2r followed by root canals preparation up to a PT F4/M2 40; in groups PT/M2, the filling materials
were removed and the root canals were prepared by PT up to a PT F4/M2 up to a M2 40. The roots were split and
photomicrographing. The percentage of clean area in the apical 5 mm was calculated using software. Data were
analyzed with the Kruskal-Wallis test.
Results: Remaining material was found in all hemisections and there was no statistically significant difference between
the groups (p = 0.09). Considering the surface of the canal walls of all teeth, the mean of the percentage of clean area
was 54%.
Conclusions: Considering the applied methodology, remaining filling material was found in all hemisections, regardless
of the retreatment technique and PT or M2 were as effective as PTr/PT or M2r/M2.
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