Patent ID: 6293795
Filing Date: 2001-09-25
Classification: A61C

Abstract:
A rotary handpiece for cleaning and enlarging a root canal of a tooth, said handpiece providing rotation to an endodontic instrument secured in said handpiece, comprising:a chuck that secures said endodontic instrument to said handpiece for rotation about its longitudinal axis;an electric motor that rotates said instrument;a control system for said motor having input and output means to control rotation of said instrument, said control systemrotating said instrument clockwise or counter-clockwise, through a first arc of rotation and, next sequentially,rotating said instrument in the opposite direction of the first arc of rotation through a second arc of rotation,wherein said first arc of rotation exceeds said second arc of rotation such that said sequentially occurring rotations cause debris material removed in cleaning said canal to be ejected upwardly from said cleaned canal surfaces as such file is advanced in cleaning said canal.