Matrix fixator for dental purposes

摘要

The invention relates to a matrix fixator (1) for dental purposes having a threaded rod (3) which can be displaced in a screwing movement on a frame (2) and which slidingly displaces with its front end (4) a sliding block (5) which releasably holds the ends of the matrix band (18) engaging through a guide slot (15, 16) to a loop (17) of adjustable width, along the frame (2). The invention is based on the object of improving the ergonomic design of a matrix fixator (1) of this type. This object is achieved, according to the invention, in that the quick-action tensioning nut (22) is provided with an oval passage opening (21) which has a threaded surface (25) on one end (23) of its larger semi-axis (24) extending approximately perpendicularly to the threaded rod (3) and a threadless surface (27) on the opposite end, and which can be brought out of engagement with the external screw thread (20) of the threaded rod (3) via a pivoting lever (30, 64) counter to the force of the clamping spring (28, 68).