Background:To evaluate the predictive performance of self-reported questions for periodontitis screening in a representative sample of a rural population. Methods:Nine questions were compared with gold standard clinical examinations (probing six sites/tooth, full-mouth). Case definition for severe periodontitis was defined according to World Workshop (2017-WW) and Centers for Disease Control and Prevention/American Academy of Periodontology (CDC/AAP). Diagnostic tests such as sensitivity (SN), specificity (SP), positive and negative predictive values were performed for all questions alone and grouped into models. Binary logistic regression modeling was used to derive parameter estimates for all variables in a given model and the area under ROC curve was calculated. Results:Clinical examinations showed a prevalence of periodontitis in the sample (n = 585) of 99.4% and 86.3%, being 40.3% and 33.8% of severe disease according to 2017-WW and CDC/AAP case definitions, respectively. Individually, only the questions regarding the self-perception of teeth/gum health and loose and lost teeth were valid to predict severe periodontitis. The best logistic regression models combined sociodemographic variables and risk-factors with the self-reported measures of selfperception of gum disease, teeth/gum health, loose teeth and history of tooth loss. Conclusion:Predictive performance of these self-reported questions presented herein support its potential use for surveillance of severe periodontitis in rural populations with high periodontitis prevalence. K E Y W O R D Sdiagnosis, periodontal diseases, self-perception, self-reported, sensitivity and specificity J Periodontol. 2020;91:617-627.

Aims To evaluate the correlation between bacterial dental plaque accumulation and gingival health in subjects with history of periodontitis attending a maintenance programme including personal oral hygiene measures (pOH) at short and extended intervals. This study is a secondary analysis of a randomized clinical trial. Materials and Methods Forty‐two subjects were randomized into groups performing pOH at 12‐, 24‐ or 48‐h intervals. The Plaque Index (PlI), Gingival Index (GI) and bleeding on probing (BoP) were recorded at baseline, 30 and 90 days. For the analysis, pOH groups were collapsed into subjects performing pOH at daily (G12/24) or extended (G48) intervals. Summary statistics and Spearman correlations between plaque accumulation and gingival inflammation are presented. Results G12/24 and G48 subjects showed significant increases in plaque scores and percentage sites with gingival inflammation over the course of study. At 90 days, G48 subjects showed significantly greater GI and BoP scores than G12/24 subjects. While PlI/GI correlations were not affected by pOH interval, PlI/BoP correlations remained unchanged with short to increase with extended pOH intervals. Conclusion pOH interval influences the correlation between bacterial dental plaque accumulation and gingival inflammation. Subjects using extended pOH intervals exhibit an increased correlation allowing accumulation of bacterial dental plaque to the detriment of gingival health. (ClinicalTrials.gov: 50208115.9.0000.5346). Clinical Trials: ClinicalTrials.gov: NCT02684682.

Aim This randomized clinical trial evaluated the effect of the frequency of self‐performed mechanical plaque control (SPC) on gingival health in subjects with a history of periodontitis. Materials and Methods Forty‐two subjects participating in a routine periodontal maintenance program were randomized to perform SPC at 12‐, 24‐ or 48‐hr intervals. Plaque index (PlI) and gingival index (GI) were evaluated at baseline, and days 15, 30 and 90 of study. Probing depths, clinical attachment levels and bleeding on probing were assessed at baseline, days 30 and 90. Mixed linear models were used for the analysis and comparison of experimental groups. Results Mean GI at baseline remained unchanged throughout study (90 days) only in the 12‐hr group (0.7 ± 0.1 versus 0.8 ± 0.1; p < .05). At the end of study, mean GI was significantly increased in the 48‐hr group over that in the 12‐ and 24‐hr groups. When GI = 2 scores were considered, only the 48‐hr group failed to maintain gingival health throughout the study (18.8%). Conclusion SPC performed at a 12‐ or 24‐hr frequency appears sufficient to controlling gingival inflammation whereas this clinical status was not maintained using a 48‐hr frequency in subjects with a history of periodontitis subject to a routine periodontal maintenance program (ClinicalTrials.gov: 50208115.9.0000.5346).

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