The invention describes a device (1) for the amelioration of a recess (8), particularly a recess in a porous material or (human) bone (7). The device comprises an element (2) for producing or coupling mechanical energy, such as ultrasonic oscillations, and a cylindrical collar (4) comprising a cylindrical lateral surface having an outside diameter and having a central recess (26) for accommodating a guide pin (3), wherein the guide pin (3) is provided to be inserted substantially down to the base of the recess (8) before applying oscillations, wherein the guide pin (3) in the region of the end thereof facing the base of the recess is surrounded by an amelioration sleeve (6) made from a material that can be liquefied by way of ultrasonic oscillations, wherein the cylindrical lateral surface of the amelioration sleeve (6) substantially has the same outside diameter as the collar (4), and wherein the guide pin (3) is accommodated in the central recess (26) in a displaceable manner such that the collar (4) upon applying ultrasonic oscillations can be displaced relative to the guide pin (3) in the direction toward the base of the recess (8) while liquefying and laterally and/or longitudinally displacing the material of the amelioration sleeve (6). The invention further describes elements of such a device, and sterile packages having such elements, and methods for the amelioration of recesses in bones, such as jaw bones or spine elements.
