The effect of different flute design and torque-controlled motor on the shaping ability of simulated resin root canals

Hyoung-Mee Roh; Bock Huh; Hyeon-Cheol Kim; Jeong-Kil Park

doi:10.5395/JKACD.2005.30.6.486

Journal List > J Korean Acad Conserv Dent > v.30(6) > 1056186

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Roh, Huh, Kim, and Park: The effect of different flute design and torque-controlled motor on the shaping ability of simulated resin root canals

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2005; 30(6): 486-492.

Published online: 30 November 2005

DOI: https://doi.org/10.5395/JKACD.2005.30.6.486

The effect of different flute design and torque-controlled motor on the shaping ability of simulated resin root canals

Hyoung-Mee Roh, Bock Huh, Hyeon-Cheol Kim, Jeong-Kil Park

Department of Conservative Dentistry, School 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, 602-739, Busan, Korea, 602-739. Tel: 82-51-240-7454, jeongkil@pusan.ac.kr

Received 21 July 2005 Revised 12 October 2005 Accepted 13 October 2005

(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.

Abstract

The purpose of this study was to compare the shaping ability of the two different Ni-Ti file systems and the two different engine systems in simulated canals.

A total of four groups of each 10 were tested. Each group was instrumented with HeroShaper®and Endo-Mate2® (Group HE), HeroShaper® and Tecnika® (Group HT), ProFile® and Endo-Mate2® (Group PE), and ProFile® and Tecnika® (Group PT).

Canal preparation time was recorded. The images of pre- and post-instrumented root canals were scanned and superimposed. The amounts of increased width and centering ratio were measured and calculated at apical 1, 3 and 5 mm levels.

These data were statistically analyzed with one-way ANOVA and Duncan's multiple range test

The results of this study were as follows;

1. Canal preparation time of HT group was the shortest (p < 0.05).

2. The amount of increased canal width in HE group was significantly larger than PT group at apical 1 mm level (p < 0.05). At apical 3 mm level, PT group was significantly smaller than other groups (p < 0.05). At apical 5 mm level, PE group was significantly larger than PT group (p < 0.05).

3. The amount of centering ratio in HE group was significantly larger than other groups (p < 0.05). At apical 5 mm level, HT group was significantly larger than PE group and PT group (p < 0.05).

Under the condition of this study, torque-controlled endodontic motor is safer than no torque controlled motor, especially when the active file is used.

Keywords: Centering ratio, Ni-Ti file, Shaping ability, Torque-controlled endodontic motor

Figures and Tables

Figure 1

Determination of the enlarged canal shape at three levels.

Figure 2

This drawing represents a measuring method. X1 represents the maximum extent of canal movements in one direction and X2 is the movement in the opposite direction. Y is the diameter of the final canal preparation.

Table 1

Classification of groups

Table 2

Preparation sequence

Table 3

Preparation time (seconds)

ANOVA analysis, significantly different at p < 0.05.

Table 4

Increased canal width (Mean ± S.D., µm)

ANOVA analysis, significantly different at p < 0.05.

a, b, c: For between-group comparisons among vertically aligned rows, VALUES that are not significantly different are annotated with the same letter.

Table 5

Centering ratio of each group (Mean ± S.D., %)

ANOVA analysis, significantly different at p < 0.05.

a, b, c: For between-group comparisons among vertically aligned rows, VALUES that are not significantly different are annotated with the same letter.

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