No abstract

No abstract

Purpose:The aim of this study was to evaluate the amount of apically extruded debris during endodontic retreatment with different file systems. Materials and Methods:Sixty extracted human mandibular premolar teeth were used in this study. Root canals of the teeth were instrumented and filled before being randomly assigned to three groups. Guttapercha was removed using the Reciproc system, the Twisted File system (TF), and Hedström-files (H-file). Apically extruded debris was collected and dried in pre-weighed Eppendorf tubes. The amount of extruded debris was assessed with an electronic balance. Data were statistically analyzed using one-way ANOVA, Kruskal-Wallis, and Mann-Whitney U tests. Results:The Reciproc and TF systems extruded significantly less debris than the H-file (p<0.05). However, no significant difference was found between the Reciproc and TF systems.Conclusion:All tested file systems caused apical extrusion of debris. Both the rotary file (TF) and the reciprocating single-file (Reciproc) systems were associated with less apical extrusion compared with the H-file.

Objectives: This in vitro study was designed to evaluate the effect of lowand high-torque settings on the amount of apically extruded debris during canal preparation with the ProTaper Universal (PTU) system. Materials and Methods: Forty extracted mandibular premolars were selected and randomly divided into two groups (n=20). Each root canal was prepared according to the manufacturer's instructions, using SX, S1, S2, F1, F2, and F3 at low-torque settings and high-torque settings. The apically extruded debris was collected into preweighed Eppendorf tubes. The weight of extruded debris was determined, and data were analyzed using the Mann-Whitney U test at a significance level of p<0.05. Results: No significant difference was observed between the groups (p>0.05). The PTU system produced the higher mean extrusion value at hightorque settings. Conclusions: Under the conditions of this study, as no difference among the different torque settings in terms of the amount of extruded debris were noted, it is possible to suggest that clinicians should choose the most appropriate settings for each case in clinical practice.