title: Postoperative Pain after Endodontic Treatment of Asymptomatic Teeth Using Rotary Instruments: A Randomized Clinical Trial.
abstract: BACKGROUND
  The aim of the present study was to compare the effect of two different rotary instruments on postoperative pain in teeth with asymptomatic irreversible pulpitis.
  
  
  METHODS
  A total of 78 mandibular first and second molars were divided into two groups (n=39) and their root canal preparation was carried out with either RaCe or ProTaper rotary instruments. All the subjects underwent one-visit root canal treatment and the severity of postoperative pain was evaluated using visual analog scale (VAS) at 4-, 12-, 24-, 48- and 72-h and 1-week intervals. In addition, the need for taking analgesics was recorded. Data were analyzed with the repeated-measures ANOVA and the Mann-Whitney U test was used for two-by-two comparison. Statistical significance was set at 0.05.
  
  
  RESULTS
  Comparison of mean pain severity between the two groups at various postoperative intervals did not reveal any significant differences (P=0.10). The difference in amount of analgesics taken by each groups was not statistically significant (P=0.25).
  
  
  CONCLUSIONS
  There were no significant differences in the postoperative pain reported between the two groups; which indicates the clinical acceptability of both systems.
authors: Dental and Periodontal Research Center, Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
authors: Shahriar
authors: S
authors: Shahi
authors: Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
authors: Vahideh
authors: V
authors: Asghari
authors: Dental and Periodontal Research Center, Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
authors: Saeed
authors: S
authors: Rahimi
authors: Dental and Periodontal Research Center, Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
authors: Mehrdad
authors: M
authors: Lotfi
authors: Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
authors: Mohammad
authors: M
authors: Samiei
authors: Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
authors: Hamidreza
authors: H
authors: Yavari
authors: Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran;
authors: Sahar
authors: S
authors: Shakouie
authors: Department of Oral and Maxillofacial Surgery, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran.
authors: Saeed
authors: S
authors: Nezafati
keywords: Flare-Up; Irreversible Pulpitis; Postoperative Pain; ProTaper; RaCe; Root Canal Treatment