Periodontal regeneration compared with access flap surgery in human intra-bony defects 20-year follow-up of a randomized clinical trial: tooth retention, periodontitis recurrence and costs.
Endoscopic Re-Instrumentation of Intrabony Defect-Associated Deep Residual Periodontal Pockets Is Non-Inferior to Papilla Preservation Flap Surgery: A Randomized Trial.