Patent ID: 7322823
Filing Date: 2008-01-29
Classification: A61C

Abstract:
1. A dental matrix retainer used as an aid when filling two-surface cavities in the molars, with a matrix holder ( 3 ) and a device for tensioning a matrix band ( 2 ) placed in the form of a loop ( 22 ) around the tooth which is to be treated, the matrix holder ( 3 ) being composed of a housing ( 5 ) with a circular opening ( 8 ), and ofa ˜inner body ( 9 ) which can turn in this opening ( 8 ) and which is provided with a gap ( 12 ), said gap ( 12 ) being able to be aligned with a slit ( 10 ) in the wall of the housing ( 5 ) such that the superposed ends of the matrix band ( 2 ) can be inserted into this slit ( 10 ) and into the gap ( 12 ) aligned therewith and can be tensioned on the tooth by turning the inner body ( 9 ), characterized in that a toothed wheel ( 13 , 27 ) is provided on the upper end of the inner body ( 9 ) protruding from the circular opening ( 8 ) of the housing ( 5 ), said toothed wheel ( 13 , 27 ) being able to be engaged immediately and to contact directly with a drive device ( 4 ) which has a laterally outwardly extended drive shaft ( 16 ), wherein the drive shaft ( 16 ) can be turned inside a tubular sleeve ( 20 ) with the aid of a rotary knob ( 19 ) provided at an end of the drive shaft ( 16 ) disposed remote from the drive pinion ( 17 ), wherein a support fork ( 21 ) protrudes forward underneath the drive pinion ( 17 ) and from the tubular sleeve ( 20 ) and can slide under an edge ( 7 ) protruding laterally from the upper end of the housing ( 5 ).