LAUSR

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-hour intervals. Plaque index (PlI) and gingival index (GI) were evaluated at baseline, and day 15, 30 and 90 of study. Probing depths, clinical attachment levels and bleeding on probing were assessed at baseline, day 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-hour group (0.7±0.1 vs. 0.8±0.1; p<0.05). At the end of study, mean GI was significantly increased in the 48-hour group over that in the 12- and 24-hour groups. When GI=2 scores were considered, only the 48-hour group failed to maintain gingival health throughout the study (18.8%). CONCLUSION SPC performed at a 12- or 24-hour frequency appears sufficient to controlling gingival inflammation whereas this clinical status was not maintained using a 48-hour frequency in subjects with a history of periodontitis subject to a routine periodontal maintenance program (ClinicalTrials.gov: 50208115.9.0000.5346).