title: Tooth loss in periodontal patients.
abstract: OBJECTIVE
  To compare tooth loss between patients who received surgical therapy for chronic periodontitis and those who received nonsurgical therapy alone.
  
  
  METHODS
  A retrospective chart study was conducted at Dalhousie University. All patients who had periodontal treatment and were active cases for at least 10 years were included (n = 335). The sample consisted of 120 males (35.8%) and 215 females (64.2%). Ages ranged from 16 to 77 (mean = 46.1 +/- 12.0 years). All patients received nonsurgical therapy; 44.8% received periodontal surgery as well. Variables recorded were demographics, initial attachment loss, treatment type, recall frequency, patient compliance and history of extracted teeth. Independent t-tests or chi-squared tests were used to compare these for surgical and nonsurgical patients. ANOVA was used to test for interactions between initial attachment loss, age, gender, compliance and type of therapy a patient received as reasons for tooth loss.
  
  
  RESULTS
  521 teeth were lost in 69 patients (20.6% of sample). Of teeth lost, 61.8% were due to periodontal disease; 24.8% to caries; 13.2% to other reasons. Patients initially diagnosed with early attachment loss lost an average of 0.37 (+/- 1.33) teeth. Patients diagnosed with moderate attachment loss lost an average of 1.50 (+/- 2.54) teeth and those diagnosed with advanced attachment loss lost an average of 3.11 (+/- 3.01) teeth. Those who received surgical therapy lost more teeth (mean = 1.31 +/- 2.36) than those who received nonsurgical treatment (mean = 0.68 +/- 1.87; p = 0.001). However, initial attachment loss was the only factor that could predict tooth loss. The type of therapy (surgical or nonsurgical) was not statistically significant.
  
  
  CONCLUSIONS
  Most periodontal patients (79.4%) who received treatment at this dental school clinic did not lose any teeth due to periodontal disease over at least 10 years. Although patients who had surgical therapy lost more teeth than those who had nonsurgical therapy alone, this was not an important predictor of tooth loss.
authors.affiliation: Faculty of Dentistry, Dalhousie University, Halifax, NS B3L 1C1. debora.matthews@dal.ca
authors.forename: D C
authors.initials: DC
authors.lastname: Matthews
authors.forename: C G
authors.initials: CG
authors.lastname: Smith
authors.forename: S L
authors.initials: SL
authors.lastname: Hanscom
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D002908:Chronic Disease; D003710:Demography; D003777:Dental Prophylaxis / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010349:Patient Compliance; D017622:Periodontal Attachment Loss / Q000473:pathology; D010518:Periodontitis / Q000150:complications* / Q000601:surgery / Q000628:therapy*; D012189:Retrospective Studies; D014081:Tooth Extraction; D016388:Tooth Loss / Q000209:etiology*