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Research Article
- A comparison of dimensional standard of several nickel-titanium rotary files
- Ki-Won Kim, Kyung-Mo Cho, Se-Hee Park, Ki-Yeol Choi, Bekir Karabucak, Jin-Woo Kim
- Restor Dent Endod 2014;39(1):7-11. Published online January 20, 2014
- DOI: https://doi.org/10.5395/rde.2014.39.1.7
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Abstract
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ePub Objectives The aim of this study was to compare the dimensional standard of several nickel-titanium (Ni-Ti) rotary files and verify the size conformity.
Materials and Methods ProFile (Dentsply Maillefer), RaCe (FKG Dentaire), and TF file (SybronEndo) #25 with a 0.04 and 0.06 taper were investigated, with 10 in each group for a total of 60 files. Digital images of Ni-Ti files were captured under light microscope (SZX16, Olympus) at 32×. Taper and diameter at D1 to D16 of each files were calculated digitally with AnalySIS TS Materials (OLYMPUS Soft Imaging Solutions). Differences in taper, the diameter of each level (D1 to D16) at 1 mm interval from (ANSI/ADA) specification No. 101 were statistically analyzed using one-way ANOVA and Scheffe's
post-hoc test at 95% confidence level.Results TF was the only group not conform to the nominal taper in both tapers (
p < 0.05). All groups except 0.06 taper ProFile showed significant difference from the nominal diameter (p < 0.05).Conclusions Actual size of Ni-Ti file, especially TF, was different from the manufacturer's statements.
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Original Articles
- A comparative study of the canal configuration after shaping by protaper rotary and hand files in resin simulated canals
- In-Seok Yang, In-Chol Kang, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh
- J Korean Acad Conserv Dent 2005;30(5):393-401. Published online September 30, 2005
- DOI: https://doi.org/10.5395/JKACD.2005.30.5.393
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Abstract
PDFPubReaderePub
The purpose of this study was to compare the canal configuration after shaping by ProTaper rotary files and ProTaper hand files in resin simulated canals.
Forty resin simulated canals with a curvature of J-shape and S-shape were divided into four groups by 10 blocks each. Simulated root canals in resin block were prepared by ProTaper rotary files and ProTaper hand files using a crown-down pressureless technique. All simulated canals were prepared up to size #25 file at end-point of preparation. Pre- and post-instrumentation images were recorded with color scanner. Assessment of canal shape was completed with an image analysis program. Measurements were made at 0, 1, 2, 3, 4, 5, 6 and 7 mm from the apex. At each level, outer canal width, inner canal width, total canal width, and amount of transportation from original axis were recorded. Instrumentation time was recorded. The data were analyzed statistically using independent
t -test.The result was that ProTaper hand files cause significantly less canal transportation from original axis of canal body and maintain original canal configuration better than ProTaper rotary files, however ProTaper hand files take more shaping time.
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- Evaluation of canal preparation with Ni-Ti rotary files by micro computed tomography
- Jeong-Ho Lee, Mi-Ja Kim, Chang-In Seok, Woo-Cheol Lee, Seung-Ho Baek
- J Korean Acad Conserv Dent 2004;29(4):378-385. Published online July 31, 2004
- DOI: https://doi.org/10.5395/JKACD.2004.29.4.378
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Abstract
PDFPubReaderePub
The purpose of this study was to compare the effects of preparation with GT files and profiles .04 in shaping of root canals and reconstruct the three-dimensional root canal system using micro computed tomography.
40 canals of the extracted human mandibular molars were used, and randomly distributed into two experimental groups. In group 1, canals were prepared by GT files. In group 2, Profiles .04. were used. Apical preparation size was #30.
For each tooth pre and post operative cross-sectional images were obtained by the micro CT at 50 micron intervals. Pre and post operative cross-sectional images of 1, 2, 3, 5, and 8mm from the apex were compared. For each section, canal area and centering ratio were determined. For each tooth pre- and post-operative root canal volume from the furcation to the apex of the roots was calculated by three-dimensional image software. Following results were obtained:
1. At 8mm from the apex, area of dentin removed by GT rotary file was significantly larger than that by Profile .04. And at the other levels there was not a significant difference.
2. There was a trend for GT rotary file to remain more centered in the canals than Profile .04 at all levels. But at 3mm level, there was a statistically significant difference.
3. In root canal volume increments after instrumentation, there was no significant difference between two groups.
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