Patent ID: 6722882
Filing Date: 2004-04-20
Classification: A61C

Abstract:
A dental instrument for use on an ultrasonic dental handpiece for performing endodontic procedures, said handpiece having an ultrasonic transducer therein and an output chuck operatively coupled to said transducer such that when the transducer is rendered resonant, said instrument having a hub adapted to be operatively coupled to said output chuck and a shank portion extending from said hub, a first portion of said shank portion extending in a generally axial direction from said hub and tip portion extending from said first portion, said shank portion having a bend therein between said first portion and said tip portion ranging between about 90Â° and about 140Â°, said tip portion having an enlarged free end portion having a substantially conical body and an end face, said conical body having a proximal end joined to said tip portion, said end face having a cross sectional diameter of about one-and-one-half times or more than the diameter of said tip portion proximate said end portion, said end face having a part spherical surface having a spherical radius from about one times to about three times the diameter of said tip portion at the intersection of said tip portion and said end portion, said end face having an abrasive coating thereon so that upon activation of said instrument by said transducer, said tip portion and said end portion vibrates in a plane including said shank portion and tip portions.