 MATERIAL AND METHODS: Sixty five patients were categorized into two treatment groups: group I -SRP plus RSV, 1.2 mg and group II -SRP plus placebo. Clinical parameters included modified sulcus bleeding index mSBI, probing depth PD, and clinical attachment level CAL, were recorded at baseline before SRP and at 1, 3, 4, and 6 months. Radiologic assessment of intrabony defect IBD fill was analysed at baseline and after 6months using computer-aided software. 