Variables affecting tooth survival and changes in probing depth: A long-term follow-up of periodontitis patients

Michael Saminsky, Michal Halperin-Sternfeld, Eli E. Machtei, Jacob Horwitz

Research output: Contribution to journalArticlepeer-review


Aim To retrospectively assess tooth-survival rate and its association with patient and oral variables in periodontal office patients, followed up to 18 years. Material and Methods Patients in a private periodontal office whose files included initial examination (T0), reevaluation (TRe) and ≥10 years after T0 (TF) chartings, and received periodontal therapy and supportive periodontal therapy (SPT) after TRe were included. General health, plaque scores (PI), probing depth (PPD), bleeding on probing (BOP) at six points/tooth, tooth extractions, and SPT visits were extracted from patient files at T0, TRe, and TF. Descriptive statistics and Cox regression analysis were performed. Results Fifty patients (mean 26 ± 4 teeth/patient, 1301 teeth) fulfilled inclusion criteria. About 20 and 129 teeth respectively were extracted before/after TRe, 96 of them for periodontal causes. PPD>7 mm at TRe (HR = 17.7, 95%CI 8.6, 36.6), age above 60 years (HR = 3.3, 95%CI 1.5, 7.2), multi-rooted teeth (HR = 1.9, 95%CI 1.2, 3.1) and SPT<3 times/year (HR = 1.8, 95%CI 1.1, 2.9), were the best prognostic factors for tooth loss during follow-up. (p < 0.05, Cox regression analysis). A continuous, statistically significant reduction was observed in mean PPD among teeth that survived follow-up [4.3 ± 1.8 mm, 3.5 ± 1.4 mm, 3.2 ± 1.3 mm, at T0, TRe, TF, respectively. (p < 0.001, Repeated-measures test)]. Conclusion Regular SPT was associated with low tooth-loss rates and continuous reductions in probing depth. PPD after initial therapy, age above 60, multi-rooted teeth and infrequent SPT were strong negative prognostic factors for long-term tooth survival among periodontal patients.

Original languageEnglish
Pages (from-to)513-519
Number of pages7
JournalJournal of Clinical Periodontology
Issue number6
StatePublished - 1 Jun 2015


  • long-term follow-up
  • periodontal private practice and statistical prediction model
  • periodontal risk factors
  • probing pocket depth
  • supportive periodontal treatment
  • tooth loss

All Science Journal Classification (ASJC) codes

  • Periodontics


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