title: Tooth loss in well-maintained patients with chronic periodontitis during long-term supportive therapy in Brazil.
abstract: OBJECTIVE
  The objective of this retrospective study was to assess the reasons for tooth loss in a sample of patients who underwent periodontal therapy and supportive periodontal therapy (SPT) in a Brazilian private periodontal practice.
  
  
  METHODS
  A sample of 120 subjects who had been treated and maintained for 10 years or longer was selected from patients attending a periodontal practice. All patients followed a similar treatment: basic procedures, re-evaluation and periodontal surgery where indicated. Reasons for tooth loss were categorized as periodontal, caries, endodontal, root fractures and extraction of retained or partially erupted third molars.
  
  
  RESULTS
  Of the 2927 teeth present at the completion of active periodontal treatment, 53 (1.8%) were lost due to periodontal disease, 16 (0.5%) for root fracture, six (0.2%) to caries, five (0.2%) for endodontic reasons and 31 (1.0%) were lost to extraction of retained or partially erupted third molars. Logistic regression analysis was performed to investigate the association between five independent variables with tooth loss due to periodontitis. Only age (> 60 years) and smoking were statistically significant (p < 0.05).
  
  
  CONCLUSIONS
  The findings of this survey were consistent with previous studies. Older subjects and smokers were more susceptible to periodontal tooth loss. In addition, patients with generalized chronic periodontitis were treated and maintained for long-term periods with low rates of tooth loss.
authors.affiliation: Discipline of Periodontics, Faculty of Dentistry, Methodist University of São Paulo (UMESP), São Bernardo do Campo, SP, Brazil. luiz.chambrone@metodista.br
authors.forename: Luiz A
authors.initials: LA
authors.lastname: Chambrone
authors.forename: Leandro
authors.initials: L
authors.lastname: Chambrone
mesh_terms: D000328:Adult; D000367:Age Factors; D001938:Brazil; D002908:Chronic Disease; D003731:Dental Caries / Q000150:complications; D003788:Dental Pulp Diseases / Q000150:complications; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D008964:Molar, Third / Q000601:surgery; D010518:Periodontitis / Q000150:complications / Q000517:prevention & control*; D012189:Retrospective Studies; D012737:Sex Factors; D012907:Smoking / Q000009:adverse effects; D014081:Tooth Extraction; D014082:Tooth Fractures / Q000150:complications; D016388:Tooth Loss / Q000209:etiology*; D014092:Tooth Root / Q000293:injuries; D014095:Tooth, Impacted / Q000601:surgery