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《Beijing Journal of Stomatology》 2009-04
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Comparison of removing nickel-titanium and stainless-steel broken files from root canal by ultrasonic technique in vitro

FU Mei,HOU Ben-xiang,ZHANG Zhi-ling.Department of Endodontics,Capital Medical University School of Stomatology,Beijng 100050,China  
Objective To compare the success rates and dentine removal amount of removing nickel-titanium and stainless-steel broken files from root canal by ultrasonic technique in vitro.Methods Sixty-four extracted mandibular incisors were divided equally into two groups with either broken nickel titanium (NiTi) files or stainless-steel (SS) K-files.Broken files were removed using ultrasonic tips combined with dental operating microscope.The number of successful case in each group was recorded.Pre-/postoperative digital radiographs were analyzed by image analyzing software to calculate the amount of dentine removed.Results The success rate of SS group was higher than that of NiTi group but the difference was not significant (P0.05),and neither was the difference of dentine removal amount.When the exposed length was shorter than 1.5mm,81% of NiTi files and 47% of SS files were successfully removed(P0.05).ConclusionOperational microscope combined with ultrasonic technique is an effective and safe method in removing broken files and the exposed length necessary for the removal is longer in SS file than in NiTi file.
【Fund】: 首都医学发展科研基金(2005-3046);; 国家自然科学基金(30872877)
【CateGory Index】: R781.05
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