Connective Tissue Graft Versus Collagen Matrix.

"The control group will be treated with a coronally advanced flap with vertical incisions (CAF) associated to an autologous connective tissue graft. The graft will be harvested from the palate in the area apical to the gingival margin of the second molar with an epithelial-connective harvesting technique to obtain a connective graft of 1 mm in thickness.~Subsequently, the graft will be shaped in order to match height and width of the recipient site on the recession according to the technique proposed by Zucchelli in 2003. The test group will receive the same flap design with the same technique, then the porcine derived xenogeneic graft will be shaped in order to match height and width of the recipient site on the recession. In particular, the matrix will be reduced in thickness as suggested by the manufacturer to obtain a standardized thickness of 3 mm."