Inclusion Criteria:  All selected patients had consent for using their data. The data of the patients who underwent PR surgery by one of the authors (S.O.B.) using SI with either PRF or CTG in the maxillary anterior teeth having contact points, at least 2 mm keratinized tissue width (KTW) with probing depth (PD)≤ 3 mm adjacent to the open embrasure were included. It was ensured that all baseline (BL) and follow-up data were available and all patients received a comprehensive phase I periodontal treatment prior to the PR procedure.  Exclusion Criteria:  the patients with systemic problems, having medications known to influence the periodontium Using tobacco/alcohol The relevant regions did not have endodontic problems/needs, caries and history of periodontal surgery.