Kiefernknochentransplantat aus Knochenmaterial menschlichen oder tierischen Ursprungs mit rinnenförmiger AussparungThe transplant has a gutter-shaped recess, and a transplant body that is covered with a laterally projecting membrane, where the transplant is made of bone material of human or animal origin. The membrane accelerates wound healing and optimally adapted to the Butterfly bone and adhered to the piece of bone. The membrane is provided on a side remote from the piece of a bone implant.