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° CCW - 30° CW, 270° CCW - 30° CW, and 150° CCW - 30° 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° CCW - 30° CW and 270° CCW - 30° C) (p<0.05). CONCLUSIONS:: Continuous rotation resulted in more postoperative pain at Day 1 than in reciprocating groups, and thereafter no significant pain was found among the groups.
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Arslan et al. (2016) studied this question.
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