title: Significance of Periodontal Risk Assessment in the recurrence of periodontitis and tooth loss.
abstract: OBJECTIVE
  To investigate the association of the Periodontal Risk Assessment (PRA) model categories with periodontitis recurrence and tooth loss during supportive periodontal therapy (SPT) and to explore the role of patient compliance.
  
  
  METHODS
  In a retrospective cohort, PRA was performed for 160 patients after active periodontal therapy (APT) and after 9.5 +/- 4.5 years of SPT. The recurrence of periodontitis and tooth loss were analysed according to the patient's risk profile (low, moderate or high) after APT and compliance with SPT. The association of risk factors with tooth loss and recurrence of periodontitis was investigated using logistic regression analysis.
  
  
  RESULTS
  In 18.2% of patients with a low-risk profile, in 42.2% of patients with a moderate-risk profile and in 49.2% of patients with a high-risk profile after APT, periodontitis recurred. During SPT, 1.61 +/- 2.8 teeth/patient were lost. High-risk profile patients lost significantly more teeth (2.59 +/- 3.9) than patients with moderate- (1.02 +/- 1.8) or low-risk profiles (1.18 +/- 1.9) (Kruskal-Wallis test, p=0.0229). Patients with erratic compliance lost significantly (Kruskal-Wallis test, p=0.0067) more teeth (3.11 +/- 4.5) than patients compliant with SPT (1.07 +/- 1.6).
  
  
  CONCLUSIONS
  In multivariate logistic regression analysis, a high-risk patient profile according to the PRA model at the end of APT was associated with recurrence of periodontitis. Another significant factor for recurrence of periodontitis was an SPT duration of more than 10 years.
authors.affiliation: School of Dental Medicine, University of Berne, Berne, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Matuliene
authors.forename: R
authors.initials: R
authors.lastname: Studer
authors.forename: N P
authors.initials: NP
authors.lastname: Lang
authors.forename: K
authors.initials: K
authors.lastname: Schmidlin
authors.forename: B E
authors.initials: BE
authors.lastname: Pjetursson
authors.forename: G E
authors.initials: GE
authors.lastname: Salvi
authors.forename: U
authors.initials: U
authors.lastname: Brägger
authors.forename: M
authors.initials: M
authors.lastname: Zwahlen
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D010512:Periodontal Index; D010518:Periodontitis / Q000145:classification / Q000150:complications / Q000517:prevention & control* / Q000628:therapy; D012008:Recurrence; D012189:Retrospective Studies; D018570:Risk Assessment / Q000379:methods*; D018709:Statistics, Nonparametric; D016388:Tooth Loss / Q000209:etiology / Q000517:prevention & control*; D016896:Treatment Outcome; D055815:Young Adult