Screw coupling force maintaining tool and screw with coupling force maintaining tool

摘要

The coupling force maintaining tool (1) has a hole (11) through which the screw portion (3) of the mini screw (2) is inserted, and a seat portion (10) for receiving the head portion (5) of the mini screw (2). Have. The binding force maintaining tool (1) has three legs (13) extending from the periphery of the seat (10) in the screwing direction of the mini screw (2). Each leg part (13) is extended so that it may spread outside from the circumference | surroundings of a seat part (10), and it may become thin gradually. When the mini screw (2) is embedded and fixed in a jawbone or the like in the oral cavity, the screw portion (3) is screwed into the jawbone or the like in a state where the screw portion (3) is inserted into the hole (11) of the coupling force maintaining tool (1). As a result, the flange (7) is received by the seat (10) and is pushed by the flange (7) so that the tips of the three legs (13) are pressed against the surface of the jawbone or the like. Thereby, drop-off of the mini screw (2) can be greatly reduced.