A dental implant mounting system for supporting a dental prosthetic on a dental implant, the system comprising: a transmucosal collar comprising a lower portion configured to coaxially engage an upper end of the dental implant, a flanged portion projecting radially outward relative to the lower portion at an upper end thereof, an axial bore passing fully through the transmucosal collar to open into the dental implant at a lower end of the lower portion, and an externally threaded cylindrical upper portion upstanding from the flanged portion around the axial bore, the flanged portion having an annular upper face closing around the axial bore and facing away from the lower portion; an internally threaded cap arranged for threaded engagement onto the externally threaded cylindrical upper portion to close off an upper end of the axial bore at a top end of the cylindrical upper portion after threaded engagement of a fixation screw into the dental implant through the axial bore; and a single-piece, mounting head and abutment combination defined by a single unitary body comprising: a standardized base portion having an underside arranged for seating atop the upper face of the flanged portion of the transmucosal collar, an axial hole opening into the standardized base portion from the underside thereof at a location arranged to align over the axial bore of the transmucosal collar when seated on the upper face of the flanged portion thereof, and a patient-specific customized dental abutment monolithically incorporated as a seamlessly integral component of the single unitary body; wherein: the abutment comprises castable material and the cap comprises cast-to material; and the axial hole of the dental abutment is a blind hole sized to accommodate receipt of the internally threaded cap, and the cylindrical upper portion of the transmucosal collar to which said cap is engaged, within the blind hole under seating of the abutment atop the flanged portion of the transmucosal collar. a transmucosal collar comprising a lower portion configured to coaxially engage an upper end of the dental implant, a flanged portion projecting radially outward relative to the lower portion at an upper end thereof, an axial bore passing fully through the transmucosal collar to open into the dental implant at a lower end of the lower portion, and an externally threaded cylindrical upper portion upstanding from the flanged portion around the axial bore, the flanged portion having an annular upper face closing around the axial bore and facing away from the lower portion; an internally threaded cap arranged for threaded engagement onto the externally threaded cylindrical upper portion to close off an upper end of the axial bore at a top end of the cylindrical upper portion after threaded engagement of a fixation screw into the dental implant through the axial bore; and a single-piece, mounting head and abutment combination defined by a single unitary body comprising: a standardized base portion having an underside arranged for seating atop the upper face of the flanged portion of the transmucosal collar, an axial hole opening into the standardized base portion from the underside thereof at a location arranged to align over the axial bore of the transmucosal collar when seated on the upper face of the flanged portion thereof, and a patient-specific customized dental abutment monolithically incorporated as a seamlessly integral component of the single unitary body; wherein: the abutment comprises castable material and the cap comprises cast-to material; and the axial hole of the dental abutment is a blind hole sized to accommodate receipt of the internally threaded cap, and the cylindrical upper portion of the transmucosal collar to which said cap is engaged, within the blind hole under seating of the abutment atop the flanged portion of the transmucosal collar. a standardized base portion having an underside arranged for seating atop the upper face of the flanged portion of the transmucosal collar, an axial hole opening into the standardized base portion from the underside thereof at a location arranged to align over the axial bore of the transmucosal collar when seated on the upper face of the flanged portion thereof, and a patient-specific customized dental abutment monolithically incorporated as a seamlessly integral component of the single unitary body; wherein: the abutment comprises castable material and the cap comprises cast-to material; and the axial hole of the dental abutment is a blind hole sized to accommodate receipt of the internally threaded cap, and the cylindrical upper portion of the transmucosal collar to which said cap is engaged, within the blind hole under seating of the abutment atop the flanged portion of the transmucosal collar. the abutment comprises castable material and the cap comprises cast-to material; and the axial hole of the dental abutment is a blind hole sized to accommodate receipt of the internally threaded cap, and the cylindrical upper portion of the transmucosal collar to which said cap is engaged, within the blind hole under seating of the abutment atop the flanged portion of the transmucosal collar.