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The Trephine Bur in the TFRK (Terauchi File Removal Kit)
The inner diameter of the TFRK-MT is Φ0.5mm, while the outer diameter is 0.8mm.
The TFRK-MT can be used when the canal curvature is less than 15° and the coronal diameter of the broken file is less than 0.45mm. Its inner depth is 1mm, exposing a 1mm portion of the broken file.
Spin the TFRK-MT counterclockwise at 600 rpm in a short in/out motion to expose the coronal 1mm of the broken file after enlarging the canal with GATE DRILLS #3 rotating at 2500 rpm to the broken file.
If the canal curvature exceeds 15°, use the K-ENDO K6 N60 2% L25 NiTi rotary file to enlarge the canal to the broken file.
If the coronal diameter of the broken file is more than 0.45mm or the canal curvature exceeds 15°, do not use the TFRK-MT. Instead, use the TFRK tips directly to prepare the space.
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