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Rotary files in endodontics9/15/2023 ![]() ![]() Left: Working end of the orifice widener with a large chip space for necessary dentin removal from the canal. The taper is indicated by notches on the instrument shaft: 2% taper file has three notches, 4% taper file has two, and 6% taper file has one notch. Right: The color coding corresponds to ISO recommendations. The 19-mm long orifice widener exhibits a taper of 10% (.06), making the entire instrument length 22 mm all other files are 25 mm long with a working portion of 13 mm. The negative cutting angle achieves passive dentin removal and prevents excessive cutting into the root canal wall.ĭesign principles of the Alpha file. This design aims to prevent instrument fracture the tested torque values are the highest in comparison to all other instruments. ![]() This makes the introduction of other files into the canal less complicated by reducing the chances of coronal sticking of the files and permits a larger quantity of irrigating fluid to be used to improve the cleaning and antibacterial effect, thus reducing postoperative complications to a minimum.įor the apical finish, instruments with a pentagonal cross-section should be used. This “pre-enlargement” provides improved tactile control and makes possible an improved insertion path with the prebent size 10 K file. Their large chip space makes them a good choice as the first instrument to work with. The files for coronal widening are kite-shaped in cross section with 10% taper. The Alpha files are commercially available in two different cross-sectional conformations. The Alpha system, developed in 2005, consists of NiTi instruments with tapers of 2%, 4%, 6%, and 10%. ![]()
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