19/21/25/31mm Dental Niti Universal Rotary Hand Use Endodontic Root Canal File. During use of NiTi rotary files, it is necessary to consider their potential for breakage. Length:19MM/21MM/25MM/31MM. A maxillary second molar and a mandibular second premolar were shaped with ProTaper files and smooth uniformly tapered canals were created more easily than with stainless steel hand files.
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