Comparative evaluation of Chlorhexidine, Metronidazole and combination gels on gingivitis: A randomized clinical trial.

Introduction: Dental plaque has been established as an etiological factor in the development of gingivitis and periodontitis. Several antimicrobials including Chlorhexidine and Metronidazole have been used as an adjuvant to mechanical plaque removal.

Objective: To compare 0.8% Metronidazole gel, 0.2% Chlorhexidine gel and alternate application of the two gels in reducing gingival inflammation when used for 14 days as an adjuvant with home based oral hygiene instructions.

Methods: The bleeding sites, probing depth and the gingival index score will be calculated. (Group A standard 0.2% Chlorhexidine gel applied on the marginal gingiva; Group B subjects will be instructed to apply 0.8% Metronidazole gel; Group C subjects 0.2% Chlorhexidine gel on the marginal gingiva after morning tooth brushing and 0.8% Metronidazole gel after evening tooth brushing). After 2 weeks second clinical examination will be carried out for bleeding sites, probing depth and the gingival index score. Scaling & polishing of teeth in all three groups and oral hygiene instructions will be reinforced. Subjects will be recalled at 6 weeks for evaluation of gingival and oral hygiene indices. Descriptive statistics for variables such as age, baseline clinical parameters including probing depth, bleeding sites, gingival index, and oral hygiene index will be computed. Generalized estimation equation (GEE) will be run to account for the correlated data for the comparison of study arms. Friedman test will be used to assess the bleeding sites among three study groups at the baseline and endpoint. Similarly, gingival index and oral hygiene index in the three groups at baseline, after 2 weeks and 4 weeks will be compared. The level of significance will be kept at 0.05.