103 adult subjects completed a supervised 2-week double-blind controlled clinical study to determine the effect of using either listerine antiseptic (LA) or its vehicle control (VC), as the only oral hygiene procedure, in inhibiting the development of and in reducing plaque and experimental gingivitis. Following baseline examinations, half-mouth prophylaxes were performed on each subject, who continued normal oral hygiene and returned 4 or 5 days later for a second baseline. Subjects then rinsed, under supervision, either 2 or 4 times daily for 2 weeks with LA or twice daily with VC, but suspended all other oral hygiene measures. Plaque and gingivitis were evaluated at baselines and after 2 weeks. Subjects using LA 2 or 4 times a day as the only oral hygiene procedure for 2 weeks demonstrated highly significant inhibition and reduction of both supragingival plaque and gingival inflammation compared to those using VC.
This double-blind, controlled clinical study compared the effectiveness of 30- and 60-s listerine rinses in both inhibiting the development of, and reducing existing, supragingival plaque and gingivitis, using an experimental gingivitis model. 94 subjects completed this study. For each subject, a modified gingival index, modified Quigley-Hein plaque index and Eastman interdental bleeding index were recorded at baseline and at 2 weeks. Following the baseline examinations, subjects received half-mouth prophylaxes, and began 2 x daily supervised rinsing either with listerine for 30 or 60 s or with a control mouthrinse for 30 s as their sole oral hygiene measure. Statistical analysis (ANCOVA) showed that both the 30- and 60-s listerine rinses were significantly (p < 0.01) more effective than the control in inhibiting and reducing plaque, gingivitis and gingival bleeding. Although 60-s rinses with listerine were significantly more effective (p < 0.01) than 30-s rinses in controlling plaque, the 2 rinse durations were similarly effective in controlling interdental bleeding and gingivitis. This study confirms the recommendation of 2x daily rinsing with listerine for 30 s as an effective regimen for gingivitis control.
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