Abstract
Aim: To evaluate the apical extrusion of debris in flat-oval canals, using three reciprocating systems at two different working lengths (WL), 0 mm and 1 mm from the apical foramen. Methods: Ninety mandibular incisors were randomly divided into three groups based on the systems: WaveOne Gold #25.07 (WOG), ProDesign R #25.06 (PDR), and X1 Blue #25.06 (X1B). Extruded debris were collected and dried in pre-weighed Eppendorf tubes. Three consecutive weighings were performed for each tube, and the mean was calculated. If the assumptions of normality and homogeneity of variance were not met, the Kruskal-Wallis test was used to analyze the amount of extruded debris between groups with the same WL, and the Mann-Whitney U test was used for comparison within groups for each WL. Results: All groups had extruded debris, with higher median values occurring at 1 mm. No significant difference regarding the amount of debris extrusion was observed at 0 mm (p>0.05) and 1 mm (p>0.05) between groups. However, within the groups, at different WL, there was greater extrusion at 1 mm (p<0.05), with PDR differing significantly from the other systems (p<0.05). Conclusion: The extrusion of debris occurred regardless of the group, with higher values at 1 mm. However, using PDR at 1 mm from the apical foramen showed the highest values of extrusion.
Highlights
Root canal preparation is an essential step of endodontic treatment that includes the cleaning, shaping, and disinfection of root canals[1]
Ninety mandibular incisors were randomly divided into three groups based on the systems: WaveOne Gold #25.07 (WOG), ProDesign R #25.06 (PDR), and X1 Blue #25.06 (X1B)
This study aimed to evaluate this occurrence with the reciprocating instruments WOG, PDR, and X1B at two different working lengths (WL)
Summary
Root canal preparation is an essential step of endodontic treatment that includes the cleaning, shaping, and disinfection of root canals[1]. The quality of root canal preparation depends on the design, kinematics, and cutting ability of instruments In this context, the nickel-titanium (NiTi) alloy increases the flexibility and cyclic fatigue strength of instruments, making them resistant to torsional failure[2,3]. The nickel-titanium (NiTi) alloy increases the flexibility and cyclic fatigue strength of instruments, making them resistant to torsional failure[2,3] Reciprocating systems with this alloy allow faster and more efficient preparation of the root canal with a single instrument[4]. WaveOne Gold (WOG) (Dentsply Sirona, Ballaigues, Switzerland) is a reciprocating system represented by a parallelogram cross-section with a variable taper This system is manufactured with NiTi gold alloy technology that increases flexibility, providing better resistance to cyclic fatigue[3,4]. Treated NiTi alloys have been reported to be more flexible with improved cyclic fatigue resistance and greater angle of deflection at failure than conventional NiTi alloy[8]
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