Abstract
Purpose: Few studies have investigated the 2017 classification of periodontitis and its effect on the prognosis of periodontal disease in Japanese people. The aim of this study was to assess the association of the new periodontitis classification with changes in the incidence rate of periodontitis-related tooth loss during maintenance.
Methods: A total of 286 patients (mean age: 52 years) treated for periodontitis with a follow-up period from 60 to 120 months at a dental clinic in Osaka were retrospectively categorized according to the new 2017 classification of periodontitis at baseline. The association of the new classification of periodontitis with the cumulative incidence rate of tooth loss due to periodontitis during maintenance was explored by using Kaplan-Meier survival analysis and analyzed by using the log-rank test.
Results: Tooth loss due to periodontitis was not found in stage Ⅰ (11 participants) or Ⅱ (63 participants) or grade A (3 participants) patients during maintenance. The 91-month cumulative incidence rates of tooth loss due to periodontitis were 0.9% and 6.9% for stage Ⅲ (159 participants) and stage Ⅳ (53 participants) patients, respectively, 0.1% and 3.2% for grade B (149 participants) and grade C (134 participants) patients, respectively, and 0.4% and 2.9% for localized (145 participants) and generalized (141 participants) patients, respectively. Statistically significant differences were observed among stages and grades, and between extents. Multivariate Cox regression analysis demonstrated that the new periodontitis classification was associated with the cumulative incidence rate of periodontitis-related tooth loss.
Conclusion: The new periodontitis classification has been shown to be associated with periodontitis-related tooth loss during maintenance.
