Periimplant soft tissue volume changes after connective tissue grafting. The autologous connective tissue graft vs. the porcine collagen matrix. A clinical follow‐up case series. (8th October 2018) - Brückbauer, Patrick; Schlegel, Karl; Neukam, Friedrich‐Wilhelm; Wichmann, Manfred; Matta, Ragai; Schmitt, Christian