Methods: This randomized trial was conducted on 75 patients with mandibular class II furcation defects. Defects were surgically treated with either access therapy alone (Group 1), access therapy+PRF (Group 2), and access therapy+ PRF+1% MF (Group 3). Clinical parameters like probing depth (PD), relative clinical attachment level {vertical (RVCAL) and horizontal (RHCAL)}, modified sulcus bleeding index (mSBI) and site specific plaque index (PI) were evaluated at baseline and 9 months post-operatively. Radiological assessment of bone defect fill was done at baseline and 9 months.