title: Outcomes of Primary Endodontic Therapy Provided by Endodontic Specialists Compared with Other Providers.
abstract: BACKGROUND
  The objective of this study was to compare the outcomes of initial nonsurgical root canal therapy for different tooth types provided by both endodontists and other providers.
  
  
  METHODS
  By using an insurance company database, 487,476 initial nonsurgical root canal therapy procedures were followed from the time of treatment to the presence of an untoward event indicated by Current Dental Terminology codes for retreatment, apical surgery, or extraction. Population demographics were computed for provider type and tooth location. Kaplan-Meier survival estimates were calculated for 1, 5, and 10 years. Hazard ratios for provider type and tooth location were calculated by using the Cox proportional hazards model.
  
  
  RESULTS
  The survival of all teeth collectively was 98% at 1 year, 92% at 5 years, and 86% at 10 years. Significant differences in survival on the basis of provider type were noted for molars at 5 years and for all tooth types at 10 years. The greatest difference discovered was 5% higher survival rate at 10 years for molars treated by endodontists. A hazard ratio of 1.394 was found when comparing other providers' success with that of endodontists within this 10-year molar group.
  
  
  CONCLUSIONS
  These findings show that survival rates of endodontically treated teeth are high at 10 years after treatment regardless of provider type. Molars treated by endodontists after 10 years have significantly higher survival rates than molars treated by non-endodontists.
authors.affiliation: Department of Endodontics, Marquette University School of Dentistry, Milwaukee, Wisconsin.
authors.forename: Jacob C
authors.initials: JC
authors.lastname: Burry
authors.affiliation: Department of Endodontics, Marquette University School of Dentistry, Milwaukee, Wisconsin. Electronic address: sheila.stover@marquette.edu.
authors.forename: Sheila
authors.initials: S
authors.lastname: Stover
authors.affiliation: Delta Dental of Wisconsin, Stevens Point, Wisconsin.
authors.forename: Frederick
authors.initials: F
authors.lastname: Eichmiller
authors.affiliation: Department of Clinical Services, Marquette University School of Dentistry, Milwaukee, Wisconsin.
authors.forename: Pradeep
authors.initials: P
authors.lastname: Bhagavatula
mesh_terms: D001641:Bicuspid; D003815:Dentists; D004708:Endodontics; D006801:Humans; D007180:Incisor; D007341:Insurance; D008963:Molar; D016016:Proportional Hazards Models; D019233:Retreatment; D012390:Root Canal Therapy / Q000379:methods / Q000706:statistics & numerical data; D015996:Survival Rate; D019227:Tooth Apex / Q000601:surgery; D014081:Tooth Extraction; D019553:Tooth, Nonvital; D016896:Treatment Outcome; D014922:Wisconsin
keywords: Non-surgical root canal therapy; outcomes; survival:hazard ratio; tooth-type; untoward events