INTRODUCTION
gingiva, Gingiva, bone dehiscence, postoperative pain
PERIOSTEUM
Gingiva is the part of oral mucosa that covers the alveolar processes of jaws and surrounds the neck of the teeth. The gingiva is divided anatomically into marginal (unattached), attached, and interdental areas (Newman et al., In this method, a horizontal incision is performed in the attached gingiva and a split‐thickness flap is raised and sutured apically. The periosteum remains exposed, the granulation tissue forms on top of the wound, and eventually, the keratinized tissue will mature. Leaving the periosteum naked may lead to postoperative pain and discomfort. In the presence of bone dehiscence, marginal bone resorption and gingival recession may occur, which is a contraindication of this technique.On the other hand, the patient's platelet derivatives have been used for many years to accelerate wound healing. Various generations have been introduced to date, the most widely used of which is the platelet‐rich fibrin (PRF) membrane (Choukroun et al., 