Patent ID: 8100691

Claim:
A bar matrix ( 10 ) for fastening a dental-prosthetic supra-construction on a bar projection ( 1 ), wherein the bar matrix has a sleeve ( 11 ) which in cross section is bent at least approximately in a U-shape, which can be held onto the bar projection and on which at least one retention element ( 14 ) is arranged for the retention of the dental-prosthetic supra-construction, the at least one retention element ( 14 , 14 ′, 14 ″; 141 ; 142 ) is a part integrally formed on the sleeve and with an essentially occlusal alignment, the bar matrix comprising: the at least one retention element ( 14 ; 14 ′, 142 ) extending over an entire length of the sleeve ( 11 ) and in a cross section has a shape of a head ( 14 ′; 143 , 148 ) with a connection neck ( 14 ″; 144 , 147 ), so that the connection neck forms a retention undercut ( 14 ′″; 145 , 146 ) on both sides, and the connection neck of the at least one retention element integrally formed offset to the apex line in a direction away from a pallatinal side and toward a buccal side of the sleeve, wherein a first retention undercut on the buccal side is smaller than a second retention undercut on the pallatinal side.