Comparative evaluation of effect of injectable platelet-rich fibrin with collagen membrane compared with collagen membrane alone for gingival recession coverage

Figure 2 Vestibular incision subperiosteal tunnel access technique using collagen membrane alone for the control sites. A: Preoperative photograph; B: Vertical access incision (control site); C: Subperiosteal tunnel preparation on the distal side; D: Subperiosteal tunnel preparation on the distal side; E: Subperiosteal tunnel preparation on the mesial side; F: Collagen membrane placement into the tunnel; G: Final suturing; H: 1 mo follow-up; I: 6 mo follow-up.