| 摘要 |
PCT No. PCT/EP93/02940 Sec. 371 Date Jun. 20, 1994 Sec. 102(e) Date Jun. 20, 1994 PCT Filed Oct. 25, 1993 PCT Pub. No. WO94/09716 PCT Pub. Date May 11, 1994A dental matrix tensioner has a casing containing a pin rotatable relative to the casing, the pin having a slot therein for releasably receiving a dental matrix and for tightening the matrix about a tooth upon rotation of the pin relative to the casing. A device to rotate the pin relative to the casing comprises an elongated assembly, and a member slidable lengthwise of the assembly in one direction to grip external portions of the casing and in an opposite direction to release those external portions of casing thereby selectively releasably to retain the rotating device in assembled relation with the casing. The lengthwise slidable member is also rotatable and is selectively engageable with the pin to rotate the pin upon rotation of the slidable member. The slidable and rotatable member has a noncircular end which fits removably in a noncircular recess in the pin whereupon when that end is inserted in the noncircular recess and sliding member is rotated, the pin is turned relative to the casing. |
