Canakci, Burhan CanEr, OzgurSen, Ozgur GencSut, Necdet2025-05-102025-05-1020210143-28851365-259110.1111/iej.136092-s2.0-85113815793https://doi.org/10.1111/iej.13609https://hdl.handle.net/20.500.14720/8012Canakci, Burhan Can/0000-0001-8872-5513; Er, Ozgur/0000-0002-4999-5104Aim This randomized clinical trial aimed to assess the effect of two rotary (ProTaper Retreatment + ProTaper Gold and Hyflex EDM) and two reciprocating (Reciproc Blue and WaveOne Gold) NiTi systems on postoperative pain after root canal retreatment on single-rooted incisor teeth. Methodology One hundred and eighty patients scheduled for root canal retreatment were randomly assigned to one of the four groups according to the NiTi system (ProTaper Retreatment + ProTaper Gold, Hyflex EDM, Reciproc Blue or WaveOne Gold) used for the removal of root canal fillings and further canal preparation. The working length was determined to be 1 mm shorter than the '0.0' mark of the apex locator. Root canals were filled with gutta-percha and an epoxy resin-based root canal sealer using a lateral compaction technique. The teeth were restored using a resin composite material. A single operator performed the retreatments in a single visit. The incidence and intensity of postoperative pain were rated on a numeric rating scale by patients 24, 48 and 72 h after retreatment. The number of analgesic tablets (400 mg Ibuprofen) taken by patients was also recorded. Data were analysed using the Mann-Whitney U, Wilcoxon and chi-square tests. Results For the intensity of postoperative pain, the difference between the four groups was not significantly different (p > .05). No significant difference was found between the groups in terms of analgesic medication intake (p > .05). Conclusions The rotary and reciprocating NiTi systems tested in this study were associated with similar intensity of postoperative pain and intake of analgesics following root canal retreatment on single-rooted incisor teeth completed in one visit.eninfo:eu-repo/semantics/closedAccessAnalgesic IntakeNitiPostoperative PainReciprocatingRetreatmentRotaryArticle5411Q1Q12016202434383324WOS:000690788900001