The effect of two rotary and two reciprocating NiTi systems on postoperative pain after root canal retreatment on single‐rooted incisor teeth: A randomized controlled trial.

Aim: 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. [ABSTRACT FROM AUTHOR]