![]() Because necrotic tissue and bacteria found in the residual gutta-percha and sealer may cause posttreatment disease, the root canal system must be reopened by eliminating the obturating material and then three-dimensional shaping, cleaning, disinfection, and obturation. Nonsurgical retreatment is intended to improve healing of periapical tissues. In some cases, the related teeth may exhibit persistent/unhealed periapical problem radiographically. To describe endodontic failure, although the root canal treatment was adequate and there were no caries, marginal staining, and/or leakage of the coronal restorations, the root canal treatments were considered clinically unsuccessful if the patient has complaints from related tooth. XP-endo Shaper is significantly more effective than R-Endo in removing root canal filling materials in the coronal, middle, and apical segments. ![]() In both groups, the coronal segments had the highest median of the residual filling material, followed by the middle and apical segments. The R-Endo group showed a significantly higher median percentage of residual filling material than the XP-endo Shaper group. Mann–Whitney U and the Kruskal–Wallis tests were used to compare the percentages of residual filling material between the teeth segments (P < .05). ImageJ software was used to estimate the percentage of residual filling material that existed on the three root canal segments. Each root was sectioned and photographed. Group 1 retreated with XP-endo Shaper file, and group 2 retreated with R-Endo files. Roots were randomly distributed into two groups corresponding to the retreatment files used. Access cavities, preparation and obturation of root canals were performed. Methodsįorty extracted mandibular first molars with curved mesial canals (25°–35°) were chosen. A temporary filling is placed into the access opening at the end of each appointment unless a permanent filling is chosen to be placed at the final visit.To compare the retreatment efficiency of XP-endo Shaper and R-Endo files in curved root canals using ImageJ software. Alternative biocompatible materials such as “MTA” or Mineral Trioxide Aggregate may also be used depending on the requirements of the case. Gutta-percha is placed to ensure the root canals are completely sealed to prevent re-infection. ![]() The next step is to fill the root canals with a biocompatible material, usually a tiny cone-shaped rubber-like material called “gutta-percha”. ![]() This is exactly the same way a cavity is cleaned and shaped on the top of the tooth and the same principle applies, just deeper within the root.
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