Abstract
Aim The study aimed at evaluating the incidence of dentinal defects after root canal retreatment with ProTaper Universal retreatment (PTUR) and XP-endo Shaper and Finisher R (XP). Materials and Methods Sixty extracted single-rooted human premolars were selected and divided into 4 groups of 15 teeth each. In the negative control group, the teeth were left unprepared. In the positive control group, the teeth were prepared with ProTaper Next and obturated with no further retreatment. In the PTUR and XP groups, the teeth were prepared and obturated followed by removal of the filling material at body temperature using PTUR and XP instruments, respectively. The roots were then sectioned at 3, 6, and 9 mm from the apex and observed under a digital microscope to detect defects. Results PTUR group showed significantly higher (p value <0.05) incidence of defects than the other groups. Comparison of no defects versus defects between groups in different areas of root canals demonstrated significant difference among the groups in the apical and cervical regions. Conclusion Within the limitations of the present study, PTUR files created significantly more dentinal defects than XP files, with most of those defects at the cervical and apical areas of the root canals.
Highlights
When root canal therapy fails, a nonsurgical approach is often possible [1], which results in a favorable, yet less than ideal outcome to initial treatment [2]
Regarding the location of the defects, significant difference among the groups in the apical and cervical regions was found, while there was no significant difference in the middle region (Table 3). e Mann–Whitney U test showed that ProTaper Universal retreatment (PTUR) had significantly more defects than XP in both the apical and cervical regions
Mandibular premolars were included in the study which were examined under a digital microscope for the presence of any external defects
Summary
When root canal therapy fails, a nonsurgical approach is often possible [1], which results in a favorable, yet less than ideal outcome to initial treatment [2]. Retreatment of the filled canals was first initiated using D1 (size 30, 0.09 taper) to create a reservoir for the solvent material; a drop of Guttasolv (Septodont, France) was introduced into each canal to soften the gutta percha. Retreatment of the filled canals was first initiated using D-Race 1 file at 800 rpm to create a reservoir for the solvent material; a drop of Guttasolv (Septodont, France) was introduced into each canal to soften the gutta percha. XPendo Finisher R was inserted in the canal and operated at 800 rpm using in and out motions with amplitude of 7–8 mm for 30 seconds In both retreatment groups, the root canals were irrigated using 2% NaOCl between each file and the final irrigation was performed using 2 ml of 2% NaOCl and 2 ml of 17% EDTA, followed by 5 ml of distilled water. All statistical analyses were performed using the SPSS ver. 25 data processing software (IBM SPSS, Armonk, NY, USA)
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