Flex R Endodontic File
The invention of Flex R File was back then when Powell noticed that the straight stainless steel tips of the files could only increase the tendency of the transport or ledge and eventually to perforate curved canals at the outer wall which is a convex curvature of the canal. It was then when Powell pointed out that the reduction of tip angle could help the file to focus on the original canal and could cut the edges or the sides evenly. This modification of the tip brought in the
Flex R File.
The tip was modified and a triangular file design was given to Flex R File. Flex R File with a non-cutting tip has a rounded tip with an “End on” or “nose” view of the tip. The cross-section area of the file is 37.5% less to that of the square file of the same size which gave the flexibility to the file’s tip. These features of the file help in gauging the tooth canal wall which makes it less likely of ledge formation.
The curved canals produced a concentrated parabolic tip which removes the elastic deformation of the instrument in a concentrated area and helps in the distribution of the forces in cutting the flutes. This helped in the reduction of canal transportation during canal preparation.
Flex R File has a balanced force technique. It has reduced the procedural accidents as the tip is rounded and safe. These files are sharper and have less negative rake angle. The modification has allowed greater control of strength and flexibility by controlling the cutting edge and cross-sectional area of the metal bulk. The file cuts in anti-clockwise rotary motion. It increases carrier effect i.e it carries more amount of debris out of the canals.