The efficacy of different single file systems in cleaning oval shaped root canal

Abstract

Aim The aim of this in-vitro study was to compare the effectiveness in cleaning oval shaped canal using different single file systems (WaveOne, OneShape, and XP-endo shaper). Materials and methods Thirty freshly extracted single rooted premolars with single, oval shaped root canals were selected. The crowns of all teeth were cut at the cementum–enamel junction to obtain root segment of ~14 ± 1 mm length. After working length determination, samples were randomly divided into three groups (n = 10) according to the file system used for root canal preparation as follow: group 1: Primary WaveOne; group 2: OneShape file; group 3: XP-endo Shaper. Sodium hypochlorite irrigant was used throughout instrumentation followed by 17% EDTA then normal saline as final rinse. The roots were splitted longitudinally into two halves and then prepared for scanning electron microscopy evaluation. The presence of smear layer and debris was recorded at apical, middle, and coronal sections of the canal. The scanning electron microscopy photomicrographs were scored based on four-scale numerical scoring system, and the scores were tabulated accordingly and statistically analyzed using Kruskal–Wallis test at a significance level of P value less than 0.05 then Mann–Whitney test was done for multiple pairwise comparisons. Results XP-endo Shaper instrument was efficient for root canal cleaning when compared with the other two single file systems. There was statistical significant difference between cleaning efficiency of all instrumentation systems at the cervical or middle as compared with the apical thirds of root canal. Conclusion Complete canal cleanliness cannot be achieved with any of the investigated single file systems.