Patent ID: 7300281

Claim:
A dental reamer or file comprising: an elongated tapered shank having a rotational axis, having a proximal end portion, a distal end and a tapered working portion extending from said proximal portion to said distal end; the external surface of said shank working portion being defined in part by a plurality of at least two equally spaced apart continuous helical flutes formed into a central core portion of said shank working portion, each flute having a semi-circular recessed depth base surface concentric with said rotational axis and providing resistance to torque breakage, the flutes having therebetween an equal number of spiraled spaced apart flanges, each flange having in a plane perpendicular to the length of said shaft, a semi-circular surface having a leading edge and a spaced apart trailing edge, each leading and trailing edge being essentially in or parallel to a plane of the said shank working portion longitudinal axis, each said leading edge providing a cutting or scraping edge.