Abstract
BackgroundDebris extrusion from the apical foramen can be problematic in severely curved canals. This study aimed to assess the use of Twisted Files (TF) at different rotational speeds during retreatment, compared with manual technique using Triple-Flex Files (TFF).MethodsForty-eight mesiobuccal root canals were randomized to four groups (n = 12 per group). In groups A, B, and C, gutta-percha was removed using TF at 500, 1000, and 1500 rpm, respectively, while it was removed using TFF in group D. Apical debris was collected in a pre-weighed centrifuge tube. The weight of dry debris was assessed by comparing the pre- and post-instrumentation weight for each group.ResultsInstrumentation in group D (0.69 ± 0.04 mg) extruded significantly more debris than any of the TF groups (A: 0.54 ± 0.05 mg; B: 0.48 ± 0.04 mg; C: 0.42 ± 0.03 mg; all P < 0.001). In addition, increasing the rotational speed of TF decreased the amount of extruded debris (A vs. B: P = 0.006; B vs. C: P < 0.001; A vs. C: P < 0.001).ConclusionsTF at 1500 rpm produced less apical extrusion debris than other TF operating speeds and TFF.
Highlights
Debris extrusion from the apical foramen can be problematic in severely curved canals
The results indicated that all retreatment techniques used in this study caused measurable apical extrusion of debris
Increasing the rotational speed of Twisted Files (TF) decreased the amount of extruded debris (A vs. B: P = 0.006; B vs. C: P < 0.001; A vs. C: P < 0.001)
Summary
Debris extrusion from the apical foramen can be problematic in severely curved canals. This study aimed to assess the use of Twisted Files (TF) at different rotational speeds during retreatment, compared with manual technique using Triple-Flex Files (TFF). The weight of dry debris was assessed by comparing the pre- and post-instrumentation weight for each group. Many techniques have been used to remove gutta-percha in root-filled teeth, such as hand files, heat, solvents, and rotary instruments [4]. Motor-driven rotary devices are associated with less dentinal debris extrusion because of their unique file. Twisted Files (TF; SybronEndo, Orange, CA, USA) are rotary nickel titanium endodontic files that were introduced in 2008. They can be twisted and converted back into an austenite structure by heating and cooling [8]. TF can work safely at higher rotational speeds, but few studies have investigated the
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