Abstract: Provided is a method for making a biotransplant, comprising introducing autologous fibroblasts isolated from an oral mucosa of a patient into a platelet-rich fibrin (PRF) membrane using linear retrograde needle injection, where a needle is inserted into a thickness of the PRF membrane and a first puncture is made and then a series of punctures are made that are linearly aligned or arrayed with the first puncture and are spaced at a predetermined distance from a prior puncture. A method of treatment of a periodontal tissue and a biotransplant comprising a PRF membrane and autologous fibroblasts are also provided.