Showed that the use of single ProTaper F2 instruments with the reciprocating motion of the ATR Technika motor resulted in similar root canal transportation but shorter preparation time in curved canals compared with a full sequence with rotary motion. Used DENTSPLY Vision Tecnika Drills/Engines For Sale - DOTmed Listing #1954932: Dentsply Tecnika Vision Endodontic Motor (rotating and reciprocating) Item is in excellent condition.Will be.
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Atr Technika Endo Motor Manual Pdf
The invention is an endodontic handpiece, its control system and method of use for rotating an endodontic file to clean a root canal. The invention control system provides for rotating a file clockwise or counterclockwise through a desired first arc of rotation and, next, sequentially rotating the instrument in the opposite direction of the first arc of rotation through a second arc of rotation, wherein the first arc of rotation exceeds the second arc of rotation such that sequentially occurring rotations cause debris material removed in cleaning the canal to be ejected upwardly from the clean surfaces as such file is advanced in cleaning the canal. 9-11-02Garman45231999-08-31Badoz44411999-08-17Brenner41051999-05-11Uejima et al.4361997-06-17Martin48861996-12-24Roane40341996-10-29Meller et al.44231996-07-23Coss et al.4191992-03-17Kobayashi et al.4341991-05-21Saito et al.4391990-03-27Jacklich46531989-05-30Edwardson48551988-09-27Levy44261986-12-16Levy45081986-09-16Roane831986-02-18Nash43561985-10-01Gardella et al.48491981-09-15Lustig et al.45291977-02-15Fleer5-08-26Landgraf et al. 'Torsional Properties of the Canal Master Instrument'; Gary R. Massa et al., Journal of Endedentics vol.
5, May 1992.' An Evaluation of the Canal Master, Balanced-Force, and Step-Back Techniques'. Hankins et al., Journal of Endodontics, vol.
Comparison of Root Canal Preparation Using Different Automated Devices and Hand Instrumentation'; Michael Hulsmann et al. Journal of Endodontics, vol. Histologic Evaluation of Three Endodontic Instrument/Preparation Techniques'; M.L. Zuolo et al.; University of Iowa College of Dentistry; Published Jan. Histomorphometric Comparison of Canals Prepared by Four Techniques'; J. Craig Baumgartner et al.; Journal of Endodontics, vol.
Torque
What is claimed:1. BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to a handpiece for rotating endodontic files to clean and enlarge root canals of teeth. More particularly, the invention focuses upon a handpiece and its control system and method of use that improves debris removal while reducing risk of file breakage.2. Description of the Prior ArtA key procedure in endodontic therapy of treating an infected tooth is cleaning and enlarging tooth root canals of the tooth prior to filling with an inert obturating material such as gutta percha. Such a procedure wherein infected tissues are successfully removed from the tooth greatly improves the likelihood that a patient will retain the tooth rather than need to have it extracted. The procedure for debridment and cleaning of infected material from the canal and to properly shape the canal to receive the obturating material is time consuming, generally employing a series of endodontic files that are rotated and advanced into the canal to clean canal surfaces and eject the debridment material from the canal for removal.In the past, endodontic files were employed by the dentist manually, a very tedious process requiring substantial skill.
It soon became evident that employing a handpiece to mechanically duplicate hand techniques, including rotating a file, would be a beneficial improvement in efficiency. However, a difficulty with motorized rotation or engine-driving of files is that the dentist sacrifices his 'feel' and control of the procedure. The files are typically provided with helical cutting edges, presenting a danger of threading or screwing into the canal surfaces. Under such conditions a file, in negotiating tight curves or other root canal irregularities, might 'lock up' and be subjected to excessive torque that could cause the file to fail by breaking. Additionally, rotation of instruments around a curve produces internal stresses resulting in metal fatigue that may cause a file to fail by breaking.
Metal fatigue is induced more rapidly as the degree of curvature increases and/or the radius of the curve decreases. Such damaging results may require an extremely difficult effort at extraction of the broken file or other remedial action, including even extraction of the tooth. The dangers of lateral perforation, straightening, zipping and ledging are also all enhanced by engine-driven instrumentation.Various rotary handpiece designs and techniques for using them have developed, some focused upon varying the motion of the files from simple rotation to reciprocating eliptical patterns, in the effort to duplicate hand operating procedures. Other handpiece improvements have focused upon controlling engine parameters, particularly by reducing speeds of rotation, setting limitations on torque applied to the file and the like to avoid file breakage.An earlier limitation of the overall endodontic preparation process was lack of flexibility of files, which tended to discourage engine-driven procedures altogether, particularly with respect to aggressive K-files. New file designs, including for example radial landed cutting edges, that avoid screwing-in and which are made of highly flexible nickel-titanium alloys present new opportunities for engine-driven procedures. These files will better follow root canal curves, but even so may be at risk of metal fatigue as they rotate in curved canals.