Drill for installing fixation pin of dental prosthesis in tooth root, has cutting portion constituted of conical end portion following cylindrical portion whose diameter is less than that of rod portion to form drill depth stop bearing

摘要

The drill has a cutting portion constituted of a conical end portion (4) following a cylindrical portion (5) that is extended by a cylindrical gripping rod (1), where diameter of the cylindrical portion is less than diameter of a portion of the rod to form a drill depth stop bearing (7). The rod is coupled to a rotational driving device. The cylindrical portion has length (L2) that is smaller than length (L1) of the conical end portion.