![]() Tapers from 0.12 to 0.02 are used with a crowndown technique. Unlike Quantec files, the K3 system has a threeblade crosssection with positive cutting angle and land reliefs behind the blades. The ideal rake angle is slightly positive, because an overly positive rake angle will result in digging and plowing of the dentin. 4.1.4.3.3 K3 NiTi Rotary Endo File System (Sybron Endo/Kerr) This system was introduced in 2002 (Figure 4.14). As dentin is dense and somewhat resilient, cutting or chip dislodgment with negative rake angles is difficult and very inefficient.Īs previously noted, negative rake angles are inefficient and result in dentin scraping rather than cutting and chip dislodgment. The Profile and most other conventional instruments utilize negative rake angles, which result in a scraping rather than a cutting action. ![]() It can also be measured relative the circumference as indicated by the green lines on the examples below. Rake angles are determined by drawing a centerline parallel to the center of the file and determining the angle relative to the centerline. Positive Rake Angle An instrument's cutting efficiency is dependant upon the overall rake angle of the instrument's cutting blades. Radial land relief reduces friction on the canal wall.ġ. The third radial land on K3 files stabilizes and keeps the instrument centered in the canal and minimizes over engagement. The K3 rotary file’s wide radial land provides blade support while adding peripheral strength to resist torsional and rotary stresses. ![]() Sybronendo develops new endodontic products constantly focused on preserving patients' natural dentition and eliminating pain. Positive rake angle provides the active cutting action of the K3 endo files. Kerr Sybronendo K3 rotary files are a state-of-the-art asymmetric endodontic file system designed with a triple cutting edge to cut quickly, efficiently and safely, with unparalleled removal of dentine and debris. Sybronendo has been an innovative manufacturer of endodontic products for the past 100 years. K3 is a third-generation, triple-fluted, asymmetric endodontic file system.
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