Effect of Intracanal Cryotherapy on Postoperative Pain Using Two Different Irrigation Systems

this study was conducted to know the effect of intracanal cryotherapy on postoperative pain using two different irrigation systems to deliver the cold saline. method: A total of 75 patients presenting with a diagnosis of irreversible pulpitis with symptomatic apical periodontitis in single rooted teeth were included in the study and randomly divided into three groups (n=25) (i.e. Control group, cryotherapy group with needle irrigation and cryotherapy group with negative pressure irrigation system). After complete root canal cleaning and shaping, final irrigation was done with 2.5°c 0.9% physiological saline in cryotherapy groups with needle irrigation (NI) and negative pressure irrigation system (NPI) whereas in control group no additional irrigation was done. Root canal treatment was completed in single visit. Participants were asked through telephone to rate their postoperative pain intensity after root canal treatment by visual analogue scale from day 1 till day 7 on given proforma. two way repeated measures of ANOVA test were applied to know the mean difference between and among the groups.