title: Endodontic status and retention of molars in periodontally treated patients: results after 10 or more years of supportive periodontal therapy.
abstract: To assess the influence of endodontic status on retention of molars in patients under supportive periodontal treatment (SPT).
  
  
  
  A total of 136 subjects with 1015 molars at baseline were examined retrospectively, including 188 endodontically treated molars in 90 patients. Multilevel Cox regression analysis identified factors contributing to loss of molars.
  
  
  
  Root canal treatments contributed significantly to loss of molars during on average 13.2 years of SPT (Hazard ratio: 2.98, 95% CI: 1.74-5.1, p < 0.001). Endodontic treatment was more frequently present in first molars (p < 0.001) and in the maxilla (p = 0.01). In endodontically treated molars, degree III furcation involvement could be detected more often compared to molars without root canal treatment (p < 0.001). Among the root canal-treated molars, several patient and tooth-related factors showed an impact on tooth retention, but only molars with a periapical index of 4 and 5 (labelled "diseased") were significantly more often lost.
  
  
  
  The retention of molars in periodontally compromised patients after periodontal treatment is influenced by periodontal as well as endodontal factors. On a long-term basis, it is feasible to retain these teeth via active periodontal treatment and SPT for more than 10 years.
authors: Section of Periodontology, Department of Conservative Dentistry Clinic for Oral, Dental and Maxillofacial Diseases, University Hospital Heidelberg, Heidelberg, Germany.
authors: Bernadette
authors: B
authors: Pretzl
authors: Department of Periodontology, Center of Dentistry and Oral Medicine (Carolinum), Johann Wolfgang Goethe-University Frankfurt/Main, Frankfurt, Germany.
authors: Peter
authors: P
authors: Eickholz
authors: Institute of Medical Biometry and Informatics (IMBI), University Hospital Heidelberg, Heidelberg, Germany.
authors: Daniel
authors: D
authors: Saure
authors: Section of Endodontics and Dental Traumatology, Department of Conservative Dentistry Clinic for Oral, Dental and Maxillofacial Diseases, University Hospital Heidelberg, Heidelberg, Germany.
authors: Thorsten
authors: T
authors: Pfefferle
authors: Section of Periodontology, Department of Conservative Dentistry Clinic for Oral, Dental and Maxillofacial Diseases, University Hospital Heidelberg, Heidelberg, Germany.
authors: Anna
authors: A
authors: Zeidler
authors: Section of Periodontology, Department of Conservative Dentistry Clinic for Oral, Dental and Maxillofacial Diseases, University Hospital Heidelberg, Heidelberg, Germany.|Department of Periodontology, Center of Dentistry and Oral Medicine (Carolinum), Johann Wolfgang Goethe-University Frankfurt/Main, Frankfurt, Germany.|Private Dental Practice, Weilburg, Germany.
authors: Bettina
authors: B
authors: Dannewitz
mesh_terms: D017823:Furcation Defects; D006801:Humans; D008437:Maxilla; D008963:Molar; D012189:Retrospective Studies; D016388:Tooth Loss
keywords: endodontic status; molar; periapical index; supportive periodontal treatment; tooth loss