title: Comparison of post-obturation pain experience following one-visit and two-visit root canal treatment on teeth with vital pulps: a randomized controlled trial.
abstract: OBJECTIVE
  To compare the incidence and intensity of post-obturation pain after one- or two-visit root canal treatment (RCT) on anterior teeth with vital pulps and a single root and canal in a randomized controlled trial.
  
  
  METHODS
  One hundred patients requiring RCT on permanent anterior teeth with vital pulps preoperatively were included. The patients were assigned randomly into two groups of 50 patients each. After local anaesthesia, isolation, access and pulp extirpation, the canals of all teeth were prepared using engine-driven rotary ProTaper nickel-titanium instruments in a crown-down technique and irrigated with 2.5% NaOCl. The teeth in group 1 (n = 50) were filled with AH Plus sealer and gutta-percha using a lateral compaction technique at the first visit, whilst those in group 2 (n = 50) were medicated with a calcium hydroxide paste, a sterile dry cotton pellet and Caviton and scheduled for a second visit 7 days later. A modified verbal descriptor scale was used to measure preoperative pain and post-obturation pain at 6, 24, 48 h and 1 week after operation. Chi-square tests and independent-sample T-tests were used to compare the incidence and intensity of post-obturation pain of two groups at each interval.
  
  
  RESULTS
  Eleven patients were excluded from the study as they failed to follow the scheduled revisit or their selected teeth had more than one root canal. Data were obtained from the remaining 89 patients. Forty-three patients were undergoing one-visit treatment (group 1) and 46 undergoing two-visit treatment (group 2). Most patients in both groups reported no pain or only slight pain within each post-obturation interval, only one in group 1 and one in group 2 had flare-ups and slight swelling. There was no statistically significant difference in the incidence and intensity of post-obturation pain experienced by two groups.
  
  
  CONCLUSIONS
  The incidence and intensity of post-obturation pain experience following one- or two-visit RCT on teeth with vital pulps and a single canal were not significantly different.
authors.affiliation: Department of Endodontics, West China School of Stomatology, Sichuan University, Sichuan, China.
authors.forename: C
authors.initials: C
authors.lastname: Wang
authors.forename: P
authors.initials: P
authors.lastname: Xu
authors.forename: L
authors.initials: L
authors.lastname: Ren
authors.forename: G
authors.initials: G
authors.lastname: Dong
authors.forename: L
authors.initials: L
authors.lastname: Ye
mesh_terms: D000328:Adult; D016009:Chi-Square Distribution; D003481:Cuspid; D005260:Female; D006801:Humans; D007180:Incisor; D008297:Male; D008875:Middle Aged; D009819:Office Visits / Q000706:statistics & numerical data*; D010147:Pain Measurement; D010149:Postoperative Pain / Q000209:etiology*; D012389:Root Canal Obturation / Q000009:adverse effects*; D012390:Root Canal Therapy / Q000379:methods*; D014098:Toothache / Q000209:etiology; D055815:Young Adult