The aim of this study was to investigate the radiographic and clinical outcomes associated with the whole papilla preservation technique in the treatment of isolated intraosseous defects in patients with stage III periodontitis. The records of 17 systemically healthy patients (12 women and 5 men) diagnosed with stage III periodontitis who underwent the whole papilla preservation technique three months after nonsurgical periodontal treatment were evaluated. The following clinical parameters were recorded at baseline and after treatment: full mouth plaque score (FMPS), full mouth bleeding score (FMBS), probing depths (PD), clinical attachment level (CAL) and gingival recession (GR). The early healing index (EHI) score was assessed 1 week after surgery in both groups. CAL gain was determined as the primary outcome. Baseline data as well as follow-up assessments at 1 month, 3 months, 6 months and 1 year were analyzed to determine the efficacy and long-term outcomes of the treatment.