title: A retrospective comparison of outcome of root canal treatment using two different protocols.
abstract: OBJECTIVE
  This retrospective study (1) compared the outcome of root canal treatment performed by an endodontist using 1 of 2 different protocols and (2) evaluated the influence of factors affecting outcome.
  
  
  METHODS
  A total of 200 teeth and 489 roots (Protocol A, 83 teeth/200 roots; Protocol B, 117 teeth/289 roots) treated nonsurgically with root canal 4 to 5 years previously were examined clinically and radiographically according to strict criteria. Generalized estimating equations were used to perform logistic regression to analyze data.
  
  
  RESULTS
  The rate of complete healing for Protocol A (78%) was similar to that of Protocol B (76%). The pulpal status (odds ratio = 2.399, P =.040) and presence (odds ratio = 1.696, P = 0.015) and size (odds ratio = 0.823, P <.001) of periapical lesion were the only factors significantly affecting treatment outcome.
  
  
  CONCLUSIONS
  The preoperative status of the pulp and the presence and extent of periapical periodontitis were important prognostic determinants of treatment outcome in this study.
authors.affiliation: Department of Conservative Dentistry, Eastman Denatal Institute for Oral Healthcare Sciences, University College London, United Kingdom.
authors.forename: Susan E
authors.initials: SE
authors.lastname: Hoskinson
authors.forename: Yuan-Ling
authors.initials: YL
authors.lastname: Ng
authors.forename: Anthony E
authors.initials: AE
authors.lastname: Hoskinson
authors.forename: David R
authors.initials: DR
authors.lastname: Moles
authors.forename: Kishor
authors.initials: K
authors.lastname: Gulabivala
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D016017:Odds Ratio; D017063:Outcome Assessment, Health Care; D010485:Periapical Periodontitis / Q000473:pathology; D011379:Prognosis; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012390:Root Canal Therapy / Q000379:methods*