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<p>New Advances in Nickel-Titanium Rotary Systems<br>Commander Melissa L. Ruff, DC, USN, Lieutenant Matthew B. Kriewaldt, DC, USN and Captain Terry D. Webb, DC, USN<br><br>Introduction<br>Since the advent of nickel-titanium (NiTi) rotary systems over two decades ago, new instrument design features have been continually introduced.1 Although NiTi instruments are now an integral part of endodontic treatment, fracture of these instruments remains a concern. Over the last several years, products have been introduced that use advanced manufacturing techniques to yield more flexible instruments which preserve canal curvature and have better resistance to cyclic fatigue to reduce fracture rate. With new versions of files rapidly introduced, the clinician may find it difficult to choose the file and technique most suitable for an individual case. The purpose of this clinical update is to review the newest endodontic nickel-titanium instrument systems, understand the nature of different NiTi instruments, and how the manufacturer intended them to be used. Although there are many instrumentation systems on the market, this Clinical Update focuses only on those systems that use newer manufacturing techniques to increase file flexibility from Dentsply Tulsa Dental and SybronEndo
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<br>Subjects: Root Canal Preparation</div>
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U.S. Navy. Naval Postgraduate Dental School</div>
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