(a) Preparing the gel of tricalcium phosphate/autologous platelet-derived growth factors. (b) Injecting the autologous platelet gel growth factors mixed with β-TCP produces a soft tissue augmentation (arrow). (c) After 8 weeks the increase of the cheek is still present. (d) The β-TCP is distributed between the bone and dermal tissues and not diffused within the vicinity of the tissues. Acid fuchsin and toluidine blue 2x.