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Introduction: Topical chemotherapeutic agents used in treatment of chronic periodontitis are antimicrobial agents which help in plaque control. The present study evaluates the efficacy of ornidazole gel with gold standard chlorhexidine gel when used as adjunct to scaling and root planing. Material and Methods: 90 patients diagnosed as chronic periodontitis, having pocket depth ?3 mm and in good systemic health were selected by systematic sampling method and divided in 3 groups. In all 3 groups scaling and root planing was done. In group A, Ornidazole gel application was done while in Group B Chlorhexidine gel application was done while Group C was control group. Plaque Index (PI) and Gingival Index (GI) were recorded at baseline, 1 and 3 months while Probing pocket depth (PPD) and Clinical attachment level (CAL) were recorded at baseline and 3 months. Results: PI and GI showed significant reduction in all three groups after 1 and 3 months compared to baseline. On inter group comparison, both PI and GI showed no significant difference in reduction of scores after 1 month and 3 months (p>0.05). PPD and CAL values showed statistically significant reduction after 3 months when compared to baseline values. The intergroup comparison revealed statistically significant reduction in group A and B compared to control group C (p

Background: The study aims to evaluate the effect of adding extracellular matrix (ECM) component – natural collagen to nanocrystalline hydroxyapatite (nHA) bone graft in the treatment of intrabony defect in chronic periodontitis patients. Materials and Methods: Forty chronic periodontitis patients having at least one intrabony defect were treated surgically by open flap debridement and the defect grafted (Group A: 20 sites grafted with nHA with natural collagen and Group B: 20 sites grafted with nHA). Plaque index, gingival index, probing pocket depth (PPD), clinical attachment level (CAL), and radiographic defect depth (RDD) were evaluated. Results: The mean PPD reduced from 7.6 ± 0.88 at baseline to 4.45 ± 0.69 and 2.60 ± 0.6 at 3 and 6 months, respectively, in Group A. In Group B, the mean PPD reduced from 7.5 ± 0.89 at baseline to 4.95 ± 0.60 and 2.65 ± 0.59 at 3 and 6 months, respectively. The mean CAL reduced from 7.75 ± 0.85 at baseline to 5.05 ± 0.76 and 3.6 ± 0.68 at 3 and 6 months, respectively, in Group A. In Group B, the mean CAL reduced from 7.70 ± 0.86 at baseline to 5.8 ± 0.7 and 3.75 ± 0.64 at 3 and 6 months, respectively. The mean RDD reduced from 8.13 ± 0.78 and 8.12 ± 0.83 at baseline to 4.27 ± 0.66 and 3.94 ± 0.5 after 6 months in Groups A and B, respectively. After 3 months, a statistically significant reduction in mean PPD and CAL values was noted in Group A while the results were comparable after 6 months. Conclusion: The effectiveness of nHA composite during initial healing phase (3 months) can be attributed to the presence of ECM-collagen in bone graft matrix.