Evaluation of an Algae-Based Biphasic Bone Graft Material and Collagen Membrane in the Treatment of Periodontal Intrabony Defects

Study population Recruited patients attending the dental clinic at the faculty of dentistry of the University of Cairo, Egypt will be included following the study eligibility criteria. Population: Patients with periodontal intrabony defects (Stage III and IV periodontitis). Intervention: Conventional flap with algae-based substitute (AlgOss) combined with collagen membrane. Control: Conventional flap with collagen membrane. Outcomes: Primary outcome: \- Clinical attachment level (CAL) Secondary outcomes: * Bleeding on probing (BOP) * Plaque index (PI) * Probing pocket depth (PPD) * Gingival recession (GR) * Defect depth and width * Radiographic depth and width * Postoperative care and satisfaction assessment