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Comparative Study on the Ability of Instruments to Maintain Original Canal Curvature of Continuous rotary System and Single File System  

Park, Sang-Hee (Dept. of Conservative Dentistry, Chonbuk National University)
Kim, Deok-Joong (Dept. of Conservative Dentistry, Chonbuk National University)
Song, Yong-Beom (Dept. of Conservative Dentistry, Chonbuk National University)
Lee, Hye-Yun (Dept. of Conservative Dentistry, Chonbuk National University)
Kim, Hyoung-Sun (Dept. of Conservative Dentistry, Chonbuk National University)
Lee, Kwang-Won (Dept. of Conservative Dentistry, Chonbuk National University)
Yu, Mi-Kyung (Dept. of Conservative Dentistry, Chonbuk National University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.28, no.4, 2012 , pp. 371-383 More about this Journal
Abstract
Shaping the root canal system to maintain original canal curvature is essential to clinical success in endodontic treatment. Opposed to most root canals that are curved, endodontic instruments are made from straight metal blanks. They have a tendency of straightening the root canal during preparation and frequently result in procedural errors. A new treatment method to maintain original canal curvature during shaping has been introduced for preventing procedural errors. The aim of this study was to compare the ability of instruments to maintain original canal curvature of continuous rotary system and single file system. Thirty ISO 15, 0.02 taper, Endo Training Blocks(Dentsplay Maillefer) were used. Specimens were assigned to 1 of 3 groups for shaping: specimens in group 1 were shaped with ProFile #20/.06 at the WL. Specimens in group 2 were shaped with Mtwo #35/.04 at the WL. Specimens in group 3 were shaped with WaveOne Primary reciprocating files at the WL after the glide path was achieved with PathFile. Pre- and postinstrumentation digital images were superimposed and processed with Matlab r2010b(The MathWorks Inc, Natick, MA) software to analyze the curvature-radius ratio(CRr), representing canal curvature modification. Data for comparison on the ability of instruments to maintain original canal curvature depending on each Ni-Ti file were analyzed with 1-way ANOVA(P<.05). Data for comparison on the ability of instruments to maintain original canal curvature depending on each Ni-Ti file system were analyzed with independent t-test(P<.05). A statistically significant difference(P<0.05) was noted on each Ni-Ti file. ProFile and WaveOne instrumentations maintained the original canal curvature significantly better(P<0.05) than Mtwo file. There were no significant difference(P>0.05) between continuous rotary system and single file system. Under the conditions of this study, ProFile and WaveOne instruments maintained the original curvature significantly better than Mtwo file and were less modification of the canal curvature compared. There was no significant difference between continuous rotary system and single file system in shaping of simulated canals. As clinical practitioners, it may be advantages to use hybrid approach when root canal shapes depending on the design and usage of Ni-Ti files.
Keywords
continuous rotary system; curvature radius ratio; Mtwo; ProFile; single file system; WaveOne;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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