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Research Article
- A survey of experience-based preference of Nickel-Titanium rotary files and incidence of fracture among general dentists
- WooCheol Lee, Minju Song, Euiseong Kim, Hyojin Lee, Hyeon-Cheol Kim
- Restor Dent Endod 2012;37(4):201-206. Published online November 21, 2012
- DOI: https://doi.org/10.5395/rde.2012.37.4.201
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Abstract
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ePub Objectives The purpose was to investigate the preference and usage technique of NiTi rotary instruments and to retrieve data on the frequency of re-use and the estimated incidence of file separation in the clinical practice among general dentists.
Materials and Methods A survey was disseminated via e-mail and on-site to 673 general dentists. The correlation between the operator's experience or preferred technique and frequency of re-use or incidence of file fracture was assessed.
Results A total of 348 dentists (51.7%) responded. The most frequently used NiTi instruments was ProFile (39.8%) followed by ProTaper. The most preferred preparation technique was crown-down (44.6%). 54.3% of the respondents re-used NiTi files more than 10 times. There was a significant correlation between experience with NiTi files and the number of reuses (
p = 0.0025). 54.6% of the respondents estimated experiencing file separation less than 5 times per year. The frequency of separation was significantly correlated with the instrumentation technique (p = 0.0003).Conclusions A large number of general dentists in Korea prefer to re-use NiTi rotary files. As their experience with NiTi files increased, the number of re-uses increased, while the frequency of breakage decreased. Operators who adopt the hybrid technique showed less tendency of separation even with the increased number of re-use.
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Original Article
- A comparison of shaping ability of the three ProTaper® instrumentation techniques in simulated canals
- So-Youn Kim, Jeong-Kil Park, Bock Hur, Hyeon-Cheol Kim
- J Korean Acad Conserv Dent 2005;30(1):58-65. Published online January 31, 2005
- DOI: https://doi.org/10.5395/JKACD.2005.30.1.058
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Abstract
PDFPubReaderePub
The purpose of this study was to compare the shaping ability of the three ProTaper® instrumentation techniques in simulated canals.
Thirty resin blocks were divided into 3 groups with 10 canals each. Each group was instrumented with manual ProTaper® (Group M), rotary ProTaper® (Group R), and hybrid technique (Group H). Canal preparation time was recorded. The images of pre- and post-instrumented root canals were scanned and superimposed. The amounts of canal deviation, total canal width, inner canal width, outer canal width and centering ratio were measured at apical 1, 2, 3, 4, 5 and 6 mm levels.
1. Canal preparation time was the shortest in R group (p < 0.05).
2. The amounts of total canal width in R group was generally larger than the other groups, but no significant differences were observed except at the 1, 3 mm levels (p > 0.05).
3. The amounts of inner canal width in R group was larger than M group at the 1 mm level and H group was larger than R group at the 6 mm level (p < 0.05). The amounts of outer canal width in R group was larger than H group only at the 1 mm level (p < 0.05).
4. The direction of canal deviation in H, R group at the 1, 2, 3 mm levels was outward and that in M group at the 1, 2 mm levels was inward. The amounts of canal deviation in H group was larger than R group at the 6 mm level (p < 0.05).
5. The amounts of centering ratio in H group was larger than R group at the 6 mm level (p < 0.05).
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