Dental prostheses cemented onto implants and/or abutments having a reverse margin

A dental restoration system, comprising:

• a dental abutment formed from a main body having a gingival part for attachment to a dental implant and an occlusal part, the main body having a longitudinal center axis,
• wherein the occlusal part of the main body has an outer profile radially closer to the longitudinal center axis than an outer profile of the gingival part at an interface between the occlusal part and the gingival part, thereby defining a shoulder between the occlusal part and the gingival part,
• and wherein a face of the shoulder that meets the outer profile of the gingival part at a maximum radial distance of the outer profile from the longitudinal axis is at an acute angle opening toward the occlusal part with respect to the longitudinal center axis;
• and
• a dental prosthesis cemented to the dental abutment using dental cement, the dental prosthesis comprising an occlusal body with an outer surface and having defined therein a cavity with an inner wall, the prosthesis being completely solid along and between the entire outer surface and inner wall, the inner wall having a profile corresponding to the outer profile of the occlusal part of the dental abutment and a margin facing the shoulder of the dental abutment, when mounted to the dental abutment, and wherein the margin is generally parallel to the shoulder but tapered with respect thereto, so as to make contact with the face of the shoulder proximate its maximum radial distance while maintaining a space between the margin and shoulder closer to the longitudinal axis in which the dental cement fills in,
• wherein the acute angle is within the range 30 to 89 degrees,
• and whereby during mounting of the dental prosthesis to the dental abutment an excess portion of the dental cement is extruded between the margin and the shoulder in a direction away from gingiva.