The effect of various kinematics on postoperative pain after instrumentation: a prospective, randomized clinical study

Objective: To evaluate various kinematic movements on postoperative pain using a Reciproc system. Material and Methods: Fifty-six molar teeth were divided into four groups according to kinematics as follows: continuous rotation, 360 degrees CCW - 30 degrees CW, 270 degrees CCW - 30 degrees CW, and 150 degrees CCW - 30 degrees CW. Preoperative and postoperative pain levels using visual analogue scale (VAS), percussion pain, and analgesic intake were recorded for each subject. Postoperative pain levels at 1, 3, 5, and 7 d were evaluated. Data were analyzed statistically using the Kruskal-Walis, Mann-Whitney-U, one-way analysis of variance, and chi-square tests (p=0.05). Results: Continuous rotation resulted in more pain at Day 1 when compared with the reciprocating groups (360 degrees CCW - 30 degrees CW and 270 degrees CCW - 30 degrees C) (p<0.05). Conclusions: Continuous rotation resulted in more postoperative pain at Day groups.