Concentrated Growth Factor Membrane in the Treatment of Adjacent Multiple Gingival Recessions: A Split Mouth Randomized Clinical Study

The gingival recessions have been successfully treated by several periodontal plastic surgery procedures. Among the different types of procedures used, Coronally Advanced Flap (CAF) was the most frequent approach, and when combined with a connective tissue graft is accepted as a gold standard therapy. Recently, investigators reported the use of CGF in the reconstruction of bone defects. They concluded that bone formation had significantly increased by using CGF It has been used to accelerate new bone formation associated with guided bone regeneration in sinus augmentation.They stated that CGF may have a better regenerative capacity and high versatility. Therefore, this study hypothesized that CGFs' placement together with CAF may enhance the healing of soft tissues. Therefore, the aim of this study was to determine the clinical effect of CGF combination with CAF compared to CAF alone in the treatment of adjacent multiple gingival recessions.

The patients of this randomized, split mouth and controlled clinical trial study protocol were selected from individuals referred to the Department of Periodontology, at Faculty of Dentistry, Bülent Ecevit University, for either dentin hypersensitivity or aesthetic complaints between April 2013 and April 2014.

All the subjects received oral hygiene instructions and full-mouth scaling were performed 1 month before surgery. They were instructed to perform a non-traumatic brushing technique (Roll) using an ultra soft toothbrush. In twenty subjects (mean age 37.10 ±1.03, 20-45years, 13 females, 7 males), one side of the jaw received CAF (control sites)( 59 defects), the opposite site received CAF+CGF (test sites) (60 defects).

Full-mouth Plaque index and Gingival index were evaluated before surgery. Custom acrylic guides were fabricated to measure the clinical parameters at the mid-buccal aspect of the treated teeth.Probing depth (PD), Clinical Attachment Loss (CAL),Recession Depth (RD),Keratinized Gingiva Width (KGW) were recorded at the mid-buccal aspect of the treated teeth. Gingival Thickness (GT) was evaluated mid-facially, 2mm apical to the gingival margin at the attached gingiva or the alveolar mucosa, using a 20 endodontic reamer attached to a rubber stopper under the local anesthesia. After carefully removing the reamer, GT was measured with a digital caliper with 0.05 resolution PD, CAL, RD, KGW and GT were assessed at baseline and 6th months. Complete root coverage (CRC)and Percentage Root Coverage(PRC) were calculated at 6th months.

Intravenous blood was collected and placed into two different a 10mL glass-coated plastic tube without anticoagulant solutions. These tubes were then immediately centrifuged with a CGF centrifuge machine. The CGF clot was removed from the tube and separated from the Red Blood Cell by using microsurgical scissors. The CGF was squeezed in a special box that produces membranes at a constant thickness of 1mm.CGF membrane was immediately placed over the recession area.