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Comparison of shaping ability of rotary Ni-Ti file systems used by undergraduates


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Comparison of shaping ability of rotary Ni-Ti file systems used by undergraduates

Article information

Restor Dent Endod. 2006;31(1):1-10
Publication date (electronic) : 2006 January 31
doi : https://doi.org/10.5395/JKACD.2006.31.1.001
Mun-Seong Kang, Hyeon-Cheol Kim, Bock Hur, Jeong-Kil Park
Department of Conservative Dentistry, College of Dentistry, Pusan National University, Korea.
Corresponding Author: Jeong-Kil Park. Department of Conservative Dentistry, College of Dentistry, Pusan National University, 1-10 Ami-dong, Seo-gu, Busan, 602-739, Korea. Tel: 82-51-240-7454, jeongkil@pusan.ac.kr
Received 2005 July 27; Revised 2005 October 18; Accepted 2005 October 27.

Abstract

The purpose of this study was to compare the shaping ability of three Ni-Ti file systems used by dental students or the experts and consequently to aid in choosing a proper systems for educational courses of dental students and beginners.

Fifty students and ten dentists who have clinical experience over two years prepared 180 simulated root canals in resin blocks with three Ni-Ti systems; ProFile® (PF), HeroShaper® (HS), K3TM (K3).

After preparation, the Ni-Ti files were evaluated for distortion and canal preparation time was recorded. The images of pre- and post-instrumented canals were scanned and superimposed. Amounts of increased canal widths, deviation, and centering ratio were calculated at apical 1, 3 and 5 mm levels and statistical analysis was performed.

The results were as follows:

  1. HS showed the shortest preparation time and instrumented canal width in K3 was significantly larger than other groups (P < 0.05).

  2. At 1 and 3 mm levels, all groups had outward deviation. In student group, at the 1 mm level, PF had the least deviation (P < 0.05).

  3. In the centering ratio, the PF had the best centering ability compared to the others at 5 mm level. At 1 and 3 mm levels, HS and PF had better abilities than K3. Student group had better ratio than the expert at 3 mm level with PF (P < 0.05).

Based on the results, it is surmised that the ProFile® is the safest and most ideal instrument for students and beginners.

Keywords: Undergraduates; Ni-Ti files; Hero Shaper; ProFile; K3; Shaping ability

References

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Article information Continued

Copyright © 2006 Korean Academy of Conservative Dentistry
(open-access) :

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Figure 1

Figure 1

Three representative superimposed images after instrumentation by each Ni-Ti file systems : ProFile® (Left), HeroShaper® (Mid), K3™ (Right). The three horizontal lines mean the measured levels of 1 mm, 3 mm and 5 mm.

Figure 2

Figure 2

Instrumented canal width and net transpo-rtation.

Net transportation = A - B

A: outward instrumented width

B: inward instrumented width

Table 1

Classification of groups

Table 1

Table 2

Design of each file systems

Table 2

Table 3

The instrumentation procedures of the Ni-Ti file systems

Table 3

Table 4

Incidence of canal aberrations by instrument types

Table 4

Table 5

The lapse of time (second) for each system (mean ± SD)

Table 5

*Significantly different values are annotated with the different superscript alphabet (P < 0.05).

Table 6

Increased canal width (µm) after root canal preparation (mean ± SD)

Table 6

*Significantly different values are annotated with the different superscript alphabet (P < 0.05).