The present invention provides a positioning device for setting implanted bearing dental prostheses in the maxillary bone or for bone grafting on the maxillary bone, including positioning interim dentures along two dimensions, a positioning member along the third dimension, structure for fixing the positioning member on the interim dentures in a specific axial position, a linking member provided with an axial nesting surface, matching a nesting surface of the positioning member, with a surface designed to be fixed to a guide element or a prosthetic element.