![]() These enhancements led to fewer instruments required to accomplish complete canal preparation. Second-generation file showing modifications on the cutting surface. The primary deficiencies of the systems in this group were the number of instruments required to achieve the complete canal preparation and the rather complex protocols needed.įigure 2. Examples of the first generation are McXim File (NT Company), GT system (Dentsply Sirona), LightSpeed (LightSpeed Technology), Pow-R (Moyco), ProFile (Dentsply Sirona), and Quantec (Tycom). ![]() The first-generation NiTi rotary files were characterized by instruments having passive cutting radial land (Figure 1), constant taper, and a neutral or negative rake angle. NiTi rotary instruments for the mechanized preparation of root canals were developed by John McSpadden and Ben Johnson in 1990. Improvements in metallurgical technology allowed the development of various new instruments with innovative designs, blade geometries, and alloy thermomechanical treatments, resulting in improved efficiency. ![]() Practitioners, universities, and companies started unprecedented cooperation to understand the countless advantages that adopting this unique metal alloy could provide for the evolution of the instrumentation technique.Īs a result, the last 3 decades have seen an explosion in the development of NiTi endodontic file systems, and tremendous progress has been made. In the early 1990s, the use of nickel-titanium (NiTi) alloy to manufacture engine-driven instruments for shaping root canals moved endodontics to a different level.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |