Treatment of Class II Mandibular Furcation Defects

Inclusion Criteria: * Patients with healthy systemic condition * Adult patients (18 years old and older) * Patients with stage lll or IV periodontitis. * Patients having a buccal or lingual degree II A or B furcation defect in periapical-lesion free and not mobile first or second mandibular molars with horizontal attachment loss HCAL \>3 mm and probing depth PD ≥5 mm in the mid-buccal or mid-lingual sites when evaluated 12 weeks after non-surgical periodontal therapy. * Patients with full mouth plaque score\<10% on the day of the surgery. * Patients with full mouth bleeding score\<10% on the day of the surgery. * Compliance with good oral hygiene. * Patients accept 12-months follow-up period (cooperative patients). * Patients provide an informed consent. Exclusion Criteria: * Ongoing drug therapy that might have an impact on the clinical signs and symptoms of periodontitis. * Defects that involve the buccal and lingual sites. * Smokers ˃ 10 cigarettes / day * Pregnant and lactating female