Following local anaesthesia, the measurement of soft tissue thickness at three points [1) occlusal part of the alveolar crest (OAC), 2) midbuccal mucosa level (MBML), 3) over 1 mm of mucogingival junction (MGJ1)] was performed with an endodontic spreader and digital caliber. Following the mid-crestal incision, the buccal flap was raised with double layer technique, while the lingual flap was left to enable direct visibility. The implant bed was drilled according to the manufacturer's protocol. The implants (BEGO Semados® RS/RSX implant system, Bremen, Germany) were placed at the bony crest. Right after the implant placement, the randomisation procedure was performed. In this group, the implants were placed in thin tissues, and T-PRF was inserted in the prepared mucoperiosteal flap at the facial site and secured with horizontal mattresses.

Following local anaesthesia, the measurement of soft tissue thickness at three points [1) occlusal part of the alveolar crest (OAC), 2) midbuccal mucosa level (MBML), 3) over 1 mm of mucogingival junction (MGJ1)] was performed with an endodontic spreader and digital caliber. Following the mid-crestal incision, the buccal flap was raised with double layer technique, while the lingual flap was left to enable direct visibility. The implant bed was drilled according to the manufacturer's protocol. The implants (BEGO Semados® RS/RSX implant system, Bremen, Germany) were placed at the bony crest. Right after the implant placement, the randomisation procedure was performed. In this group, the implants were placed in thin tissues, and CTG was inserted in the prepared mucoperiosteal flap at the facial site and secured with horizontal mattresses.

A total of 40 ml blood sample was collected from the antecubital vein of the patients' right or left arms with 10 ml injectors. 40 ml blood was transferred to a grade-IV titanium tube for the T-PRF group. The titanium tubes containing the blood samples were instantly centrifuged in a tabletop centrifuge at room temperature. The blood samples of the T-PRF group were centrifuged clockwise at 2700 RPM for 20 minutes. Subsequent to the centrifugation process, the clots of the T-PRF group were removed from the tubes with sterile tweezers, separated from the RBC base with scissors, and left for over 20 minutes on sterile woven gauze to release the serum slowly from the collected clots. The implants were placed in thin tissues, and the thickness of the thin tissues was simultaneously increased with T-PRF.

The measurement of soft tissue thickness at three points: occlusal part of the alveolar crest (OAC), midbuccal mucosa level (MBML), over 1 mm of mucogingival junction (MGJ1)]

The measurement of the keratinised tissue width between the cover screw and the mucogingival junction.