The effect of the design of the irrigation needle used during endodontic treatment on postoperative pain: a randomize clinical trial

The aim of this study is to evaluate the effect of irrigation needles with different designs on postoperative pain during endodontic treatment. This randomized clinical study was conducted on 66 patients with symptomatic irreversible pulpitis of the mandibular molars. The patients were divided into 3 groups according to the design of the irrigation needle used during root canal treatment. Open-ended irrigation needle was used in group 1, side-port closed-ended irrigation needle was used in group 2, and double side-port closed-ended irrigation needle was used in group 3. After completion of root canal treatment, preoperative and postoperative pain levels were evaluated at 6, 24, 48, 72 h and 7 days. The data were analyzed by the Pearson chi-square test and Fisher's exact tests. Postoperative pain was highest at 6 h in all groups. A significant decrease in pain over time was observed in all groups (p < 0.05). No statistically significant differences in postoperative pain were found between the groups at any time point (p > 0.05). The design of irrigation needles used during endodontic treatment does not appear to affect postoperative pain levels. Clinical trial registration: Registration number is "NCT07080918".