| 摘要 |
PROBLEM TO BE SOLVED: To achieve miniaturization by enabling the working lengths of the needles of numerous dental root canal forming instruments to be rapidly set at the same length, and enabling the needles to be preserved (aligned) in order in a line. SOLUTION: A plurality of through holes 1b through which the needle parts of dental root canal forming instruments can be passed are bored in a straight line in the upper surface 1a of an upper base to which the lower surface of a rubber stopper abuts, the upper base 1 constituting at least a portion of the upper surface of a casing 2 taking the form of a rectangular solid. A lower base 3 having an upper surface 3a which is parallel to the upper surface la of the upper base 1 and to which the end of the needle part of each dental root canal forming instrument abuts is supported by two or more supports 4, 5 being perpendicular to the upper surface 1a of the upper base 1 and placed parallel to each other inside the casing 2, and an internal thread 3b cut in the lower babe 3 is fitted over an external thread 4b cut on the outer peripheral surface of the rotating support 4 freely rotationally attached to the casing 2. |
