Abstract: Accressory burnishing-treatment apparatus for treatment, namely deburring, turning corners, polishing or cleaning of elements, namely metal, plastic, or ceramic (typically glass) elements. The apparatus is a self-contained hollow sphere, preferably made from substantially abrasion-resistant plastic, that works in conjunction with typically any traditional vibratory tumbling machine. The apparatus preferably has a screw-in port lid or closure member which opens to spherical inner space allowing insertion and later removal from the spherical inner space each of elements after treatment thereof, and removal of that was media necessary for the treatment. Liquid and/or dry or wet media may be used with the elements in combination.

Abstract: A dental instrument adapted to be used as a dental file and dental reamer for removing dead or damaged tissue from the root canal of a tooth. The dental compactor instrument is formed with a tapered shank having at least two helical flutes defining at least two continuous helical cutting edges. A helical peripheral land extends between the helical flutes at the periphery of the shank. The cutting edges have a neutral rake angle.

Abstract: The specification discloses a micro drill with a modified point in which the drill is formed from a rigid cylinder and has two opposed helical wings and helical edges. Each wing has an undercut leading surface to provide a positive rake angle at the helical edges of the wings, and the two wings have a smooth "S" shaped cross-section. Two opposed flanks are formed by an inclined cut in each of the wings providing the drill point with a somewhat V-shape, and a leading corner is defined on each of the wings at the intersection of the helical edge and the flanks. A cut is provided in each of the leading surfaces adjacent to and below the flanks thereby forming a cutting edge on the drill point with an increased positive cutting action. The drill may be cut so that an under-surface is formed immediately below each flank and its cutting edge and so that a side surface is formed in the wings in an orientation perpendicular to the under-surface.