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<p>New Developments in Rotary Nickel-Titanium Instruments<br>Lieutenant Commander Evan Whitbeck, DC, USN and Colonel Kathleen McNally, DC, USA<br><br><br>Introduction<br>Historically, carbon steel and stainless steel instruments were used for root canal instrumentation. In 1988, Walia and col-leagues introduced nickel-titanium (NiTi) files to endodontics1. Since then, many NiTi file systems have been developed. Rotary NiTi instruments have become popular as they can clean and shape root canals with fewer procedural errors and more predicta-bility than stainless steel hand files2. The purpose of this clinical update is to 1) review new developments in nickel-titanium metal-lurgy and their impact on rotary NiTi file systems, and 2) discuss the advantages and disadvantages of using NiTi files in a recipro-cating motion versus a continuous rotary motion.
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<br>Subjects: Root Canal Therapy</div>
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U.S. Navy. Naval Postgraduate Dental School</div>
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