RF40 .04 Taper 21 mm KontrolFlex Rotary NiTi File
Brasseler USA's KontrolFlex files strike the ideal balance between cutting efficiency and safety. Unlike traditional NiTi files, KontrolFlex files feature Controlled Memory NiTi Technology. This patented technology alters the properties of NiTi allowing the files to be pre-curved and highly resistant to cyclic fatigue. Other Controlled Memory files on the market can experience a drastic reduction in cutting efficiency as a result of the softened metal. The KontrolFlex file was developed to meet the needs of endodontic specialists who encounter extremely difficult curved and calcified cases.