Dental matrix tensioner as an auxiliary means in the filling of double-surface tooth holes, comprising a mat (3) and a drive device (4) for tensioning a matrix tape (2) placed in the form of a ring (22 ) around the tooth to be treated, wherein the matrix holder (3) is constituted by a housing (5) with a circular opening (8) and a rotating spindle (9) in this opening (8) and provided with a gap (12) , whose interstitium (12) can be aligned with a groove (10) of the housing wall (5), so that the matrix tape (2) can be introduced with its ends superimposed on this groove and in the interstitium aligned with it and can be tensioned against the tooth by turning the inner body, characterized in that a gear wheel (13, 27 is provided on the upper end of the spindle (9) protruding from the circular opening (8) of the housing (5) ) that can be coupled with the drive device (4), which has a drive shaft (16) extending laterally outward.
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