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° 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. © 2016,faculdade de odontologia de bauru. all rights reserved.