Flexo Reamer ( endodontic instrument ) Uses and Safety tips
Design & Structure
Flexoreamers are manufactured from a triangular steel wire that is twisted to give the typical shape of a reamer. The angle between the long-axis and the cutting blade is small, and therefore preparation by flexoreamer is effective only in rotatory motion.
The tip of the instrument is non-cutting (‘bat-tip’, ‘inactive tip’) making flexoreamer well suited for the preparation of evenly curved canals without risk of ledging.
Sizes & Codes
Flexoreamers come in sizes 15 – 40, all with a taper of 0.02. Reamer design is identified by the triangle symbol on the handle.
Flexoreamers are best distinguished from normal reamers by the size code at the top of the instrument: in flexoreamers the colour of the number is the same as the colour of the handle.
The flexoreamer is well suited both for straight canals and slightly curved canals. It prepares dentin in rotation but not if used as a file. The cutting efficiency and usability of flexoreamers are excellent. In slightly curved canals the recommended techniques are continuous rotation (upper picture) when the resistance is small and balanced force (lower picture) against greater resistance.
Flexoreamers can be rotated only using moderate pressure. Use of force, particularly with smaller sized instruments, may result in distortion of the helical structure and ultimately in fracture. Every instrument should be checked for symmetry by rotating it against an even background before introducing it into the canal.
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