Abstract: A lattice for the fixation of bone parts or for the bridging of bone defects, particularly in the region of the skull and jaw, is made of biocompatible material with a reticular structure and with recesses for receiving bone screws, with which the lattice can be secured on the bone. The lattice does not have circular rings for receiving bone screws, but instead each lattice recess (32) can be used for receiving a bone screw. The bridges form meandering, continuous, regular bridge rows along the main axes of the lattice.

Abstract: An osteosynthesis device comprises a plate and screws which are screwed into bone through holes in the plate. The diameters of the holes at the top face of the plate are larger than at the bottom face of the plate. The screws have a spherical head which, when screwed in rests snugly against the wall of the screw hole with an annular contact surface. Both when the screw is located perpendicularly with respect to the plate and when located at an angle with respect to the plate, the contact surface is located above the center line of the hole depth.