الفهرس | Only 14 pages are availabe for public view |
Abstract Complete removal of the defective root canal filling material and regaining apical patency is the main factor of endodontic retreatment success. Aim of the study: Assessment of the ability of Reciproc R25 (VDW, Munich, Germany), Reciproc blue (VDW, Munich, Germany) and the XP-endo shaper (FKG Dentaire, La Chauxde- Fonds, Switzerland) in removing of the root filling material from oval shaped canals using cone beam computed tomography (CBCT). Materials and Methods: Thirty six extracted single rooted human mandibular premolar teeth were prepared chemo-mechanically using Revo-S rotary file system (Micro-Mega, France) and obturated. The teeth were randomly divided into three groups (N=12 each) according to files used in retreatment procedure as follow: group I: Reciproc R25, group II: Reciproc blue, group III: XP-endo shaper. Cone beam computed tomography (CBCT) was used to scan the specimens before and after retreatment to measure the volume of filling material by using (Osirix lite) software. Also, time consumed by each file was recoded. Volume of remaining obturating material was compared between groups using Kruskal Wallis Test. Intragroup comparisons before and after gutta perch removal were done using Wilcoxon Sign Rank test. Comparisons between apical, middle, and coronal thirds percent reduction within each group were done using Freidman test, while differences in time required for gutta percha removal were compared using One Way ANOVA test and followed by Tukey’s post hoc test. Results: All systems significantly removed gutta percha. However, none of the used files completely removed the root canal filling material from the canals. No statistically significant differences (P> 0.05) in residual filling material were observed among the groups, the percentage of reduction was 88.87 % in (group 1), 92.22 % in (group 2), and 88.60 % in (group 3). Coronally, Reciproc blue left less remnants with no significant difference between the groups (P>0.05). In the middle third XP-endo shaper left less remnants with no significant difference between the groups(P>0.05). In the apical third Reciproc R25 left less remnants with no significant difference between groups (P>0.05). Time consumed by each file showed statistically significant difference between XP-endo shaper and the two other groups. More time required by the XP-endo shaper by average mean (10.52 min) followed by Reciproc blue (6.67 min) then Reciproc R25 (5.38 min). |