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Inside Dentistry
October 2016
Volume 12, Issue 10

KontrolFlex™ NiTi Files

Take the stress out of shaping difficult canals

Figure 1 | In today’s market, NiTi instruments are available along a spectrum that spans from pure austenitic phase instruments to pure martensitic phase instruments. These two forms represent two crystalline structures of the same nickel titanium metal, each with different characteristics. Traditional NiTi files are in the austenite phase at room temperature and are referred to as “shape memory” files (ie,.Brasseler ESX® files). Alternatively, heat-treated files are in their martensitic crystalline phase at room temperature and these files are referred to as “controlled memory” files (ie, Brasseler KontrolFlex™ files).

The clinical performance of two files of similar design and size can be remarkably different depending on their phase state. In general, austenitic files are more resistant to excessive torque and less resistant to cyclic fatigue, while martensitic files are just the opposite. Also, austenitic files will be stiffer and sharper than martensitic files of similar size and shape.

ESX and KontrolFlex rotary files are therefore best used for different circumstances: ESX files will serve you best when you want to be as efficient as possible (basic cases), while KontrolFlex files will rise to their best advantage when treating severely curved canals or cases with limited access where pre-curving is advantageous (advanced cases).

(Controlled Memory)

KontrolFlex files are heat-treated and are available in two distinct metallurgies designated as “Series I” and “Series II.” The first is a pure version of a heat-treated file that results in a very ductile, cyclic fatigue resistant instrument. It is ideal for severe curves, getting around ledges, and difficult access. It can be pre-curved and will hold its curve once placed as well as any file available. As a pure martensitic phase instrument it will be very flexible, but softer and subject to unwinding easier than some other martensitic phase instruments (but no other instrument will be more flexible and hold its curve better). It is even possible to put a “J hook” on the tip, similar to a stainless steel hand file. The second series is intended for those looking to have a file that is the best of both worlds. It is less flexible and cyclic fatigue resistant than the series one KontrolFlex, but less susceptible to unwinding as a result of torque. In the event of modest deformation, KontrolFlex files (both series 1 and series 2) exhibit the unique ability to reform when heated (either chairside with a heat source or via autoclave).

Your case selection ultimately dictates what file system(s) are best suited for your practice. The unique features of KontrolFlex make them a welcome addition to any practitioner doing more advanced cases. Contact Brasseler today to schedule a demonstration of these files in the comfort of your office.

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