A dental abutment or mounting head features a base of predetermined size and shape arranged for seating atop a flanged portion of a transmucosal collar that is fastened to a dental implant. An axial hole opens into the abutment/head from the underside thereof at a location arranged to align over an axial bore of the collar through which the collar is fastened to the implant. An upper portion of the abutment/head for supporting a dental prosthetic or framework is customized for the patient concerned. The predetermined base portion occupies substantially the entire face of the collar flange to provide optimal support of the abutment/head. As an interface between the implant and the abutment, the collar avoids the need to customize the base of the abutment to fit the particular brand or model of implant used, thereby reducing the amount of custom design and/or fabrication needed to fit the application.
