title: Treatment outcome in endodontics: the Toronto study--phase 4: initial treatment.
abstract: Outcome 4-6 years after initial treatment was assessed for Phase 4 (2000-2001) of the Toronto Study. Of 582 teeth treated, 430 were lost to follow-up (99 discontinuers, 331 dropouts), 15 were extracted, and 137 (32% recall minus 15 extracted teeth) were examined for outcome: healed (no apical periodontitis, signs, symptoms) or diseased. When pooled with Phases 1-3, 439 of 510 teeth (86%) were healed. Logistic regression identified 2 significant (P < or = .05) preoperative outcome predictors: radiolucency (odds ratio [OR], 2.86; confidence interval [CI], 1.56-5.24; healed: absent, 93%; present, 82%) and number of roots (OR, 2.53; CI, 1.25-5.13; healed: single, 93%; multiple, 84%). In teeth with radiolucency, intraoperative complications (OR, 2.27; CI, 1.05-4.89; healed: absent, 84%; present, 69%) and root-filling technique (OR, 1.89; CI, 1.01-3.53; healed: lateral, 77%; vertical, 87%) were additional outcome predictors. A better outcome was suggested for teeth without radiolucency, with single roots, and without mid-treatment complications. The predictive value of root-filling technique in teeth with radiolucency requires validation from randomized controlled trials.
authors.affiliation: Discipline of Endodontics, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Cristian
authors.initials: C
authors.lastname: de Chevigny
authors.forename: Thuan T
authors.initials: TT
authors.lastname: Dao
authors.forename: Bettina R
authors.initials: BR
authors.lastname: Basrani
authors.forename: Vincent
authors.initials: V
authors.lastname: Marquis
authors.forename: Mahsa
authors.initials: M
authors.lastname: Farzaneh
authors.forename: Sarah
authors.initials: S
authors.lastname: Abitbol
authors.forename: Shimon
authors.initials: S
authors.lastname: Friedman
mesh_terms: D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009864:Ontario; D010485:Periapical Periodontitis / Q000000981:diagnostic imaging / Q000628:therapy*; D011379:Prognosis; D011859:Radiography; D012390:Root Canal Therapy; D016896:Treatment Outcome