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KMID : 1004520120280040371
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Journal of Dental Rehabilitation and Applied Science
2012 Volume.28 No. 4 p.371 ~ p.383
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Comparative Study on the Ability of Instruments to Maintain Original Canal Curvature of Continuous rotary System and Single File System
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Park Sang-Hee
Kim Deok-Joong
Song Yong-Beom
Lee Hye-Yun
Kim Hyoung-Sun
Lee Kwang-Won
Yu Mi-Kyung
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Abstract
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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.
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KEYWORD
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continuous rotary system, curvature radius ratio, Mtwo, ProFile, single file system, WaveOne
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