Methodology
GENERALIZED PERIODONTITIS, PCT, BLIND
 In total, 16 systemically healthy volunteers with stage 3 grade B generalized periodontitis were recruited for this prospective double blind, randomized placebo-controlled trial. After receiving SRP, the subjects received the following interventions in a split-mouth design at baseline, 1 week and 1 month: Group 1 – Placebo gel + Sham PCT; Group 2 – Nano ZnO gel + Sham PCT; Group 3 – Placebo gel + PCT; and Group 4 – Nano ZnO gel + PCT. The site-specific profile of 