A dental abutment, or a dental implant having an integrated abutment, in which the occlusal part of the abutment to which the dental prosthesis is to be cemented features a shoulder having a reverse margin. At the point where the shoulder meets the outer profile of the gingival part of the abutment, the shoulder is at an acute angle with respect to the longitudinal center axis of the abutment, thereby causing any cement ejected during mounting of the prosthesis to be ejected in a direction away from the gingiva.