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- W1684644579 abstract "Aim: To compare the effectiveness of the ProTaper Universal ® Retreatment system, the D-Race ® NiTi system and Hedstroem fi les for removal of fi lling material from curved root canals. Methodology: A total of 39 fi rst mandibular molars were selected and their mesiobuccal (MB) canals were used for the study. Teeth were assigned to one of three identical groups (n = 13 per group) according to removal technique: G1 – ProTaper Universal ® Retreatment (D1, D2, D3); G2 – D-RaCe ® (DR1, DR2); or G3 – Hedstroem fi les (35, 30, 25, 20). In all groups, supplementary fi les were used for re-preparation. Digital subtraction radiography images were produced by superimposing the fi rst radiograph, taken after fi lling the canal, over the second, taking after removal of the fi lling, in buccolingual (BL) and mesiodistal (MD) projections. Quantitative data were analyzed using intraclass correlation coef fi cients and the Kruskal-Wallis and Friedman non-parametric tests (p ≤ 0.05). Results: Comparison of groups detected no differences in fi lling removal between teeth in the ProTaper Universal ® Retreatment, D-RaCe ® or Hedstroem fi le groups for the cervical or mid thirds (for either MD or BL projections). In the apical third (MD projection), ProTaper Universal ® Retreatment produced the best results; and Hedstroem fi les exhibited the worst results (MD projection). Intra-group comparisons showed that the cervical third was the cleanest and the apical third was the least well-cleaned, for the ProTaper Universal ® Retreatment and D-RaCe ® groups (MD projection), while less filling material was removed using Hedstroem when the canals approached the apical third (MD and BL projections). Conclusions: Our fi ndings indicate that the ProTaper Universal ® Retreatment system is the best choice for endodontic fi lling material removal, combined with supplementary instrumentation to achieve better results in the apical third." @default.
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- W1684644579 date "2014-12-01" @default.
- W1684644579 modified "2023-09-22" @default.
- W1684644579 title "Effectiveness of ProTaper Universal® and D-RaCe® retreatment files in the removal of root canal filling material: an in vitro study using digital subtraction radiography" @default.
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