Control group (MARF)
PERIOSTEUM
A horizontal incision was made by a blade (no. 15) approximately 0.5 mm coronal to the mucogingival junction. The split‐thickness flap was elevated and the dissection was extended 5 mm in an apical direction. The coronal part of the flap would contain a band of keratinized tissue. The extension of the incision depends on the teeth involved so that at least one and a half teeth are extended on each side (mesiodistal). This extension allows the flap to be repositioned apically. The flap is sutured to the periosteum in the apical position by resorbable sutures (Vycril® 4.0; ETHICON, Cincinnati, Ohio, USA). A homogeneous layer of periosteum with no elastic or fibers remained on the bone. A periodontal dressing without eugenol (COE‐PAK™; GC Corporation, Alsip, Illinois, USA) was used on top to protect the wound (Figure 