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HOME > Restor Dent Endod > Volume 36(1); 2011 > Article
Basic Research Comparison of apical transportation and change of working length in K3, NRT AND PROFILE rotary instruments using transparent resin block
Min-Jung Yoon, DDS, MSD1, Min-Ju Song, DDS, MSD2, Su-Jung Shin, DDS, MSD2, Euiseong Kim, DDS, MSD, PhD1
2011;36(1):-65.
DOI: https://doi.org/10.5395/JKACD.2011.36.1.59
Published online: January 31, 2011

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Correspondence to Euiseong Kim, DDS, MSD, PhD. Associate Professor, Department of Conservative Dentistry, Yonsei University College of Dentistry, 250 Seongsanno, Seodaemun-gu, Seoul, Korea 120-752. TEL,+82-2-2228-8701; FAX,+82-2-313-7575; andyendo@yuhs.ac
• Received: November 24, 2010   • Revised: January 5, 2011   • Accepted: January 7, 2011

Copyright © 2011 Korean Academy of Conservative Dentistry

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  • Objectives
    The purpose of this study is to compare the apical transportation and working length change in curved root canals created in resin blocks, using 3 geometrically different types of Ni-Ti files, K3, NRT, and Profile.
  • Materials and Methods
    The curvature of 30 resin blocks was measured by Schneider technique and each groups of Ni-Ti files were allocated with 10 resin blocks at random. The canals were shaped with Ni-Ti files by Crown-down technique. It was analyzed by Double radiograph superimposition method (Backman CA 1992), and for the accuracy and consistency, specially designed jig, digital X-ray, and CAD/CAM software for measurement of apical transportation were used. The amount of apical transportation was measured at 0, 1, 3, 5 mm from 'apical foramen - 0.5 mm' area, and the alteration of the working length before and after canal shaping was also measured. For statistics, Kruskal-Wallis One Way Analysis was used.
  • Results
    There was no significant difference between the groups in the amount of working length change and apical transportation at 0, 1, and 3 mm area (p = 0.027), however, the amount of apical transportation at 5 mm area showed significant difference between K3 and Profile system (p = 0.924).
  • Conclusions
    As a result of this study, the 3 geometrically different Ni-Ti files showed no significant difference in apical transportation and working length change and maintained the original root canal shape.
  • Keywords: Apical transportation; K3; NRT; PROFILE; Working length changes
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Figure 1
Photograph of a jig that maintains a constant distance between a X-ray tube and a resin block.
jkacd-36-59-g001.jpg
Figure 2
Photograph of a resin block and a digital sensor. (a) Holding part of digital radiographic sensor. (b) Cartesian system. (c) Table for constant position of resin block.
jkacd-36-59-g002.jpg
Figure 3
(a) Initial X-ray. (b) X-ray after canal enlargement. (c) Image of the x-ray after canal enlargement processed by Adobe photoshop.
jkacd-36-59-g003.jpg
Figure 4
(a) Image of central axis. (b) Measurement of apical transportation using AuotCAD 2000.
jkacd-36-59-g004.jpg
Table 1
Mean curvature and working length in three groups

W.L, working length; n, sample size.

jkacd-36-59-i001.jpg
Table 2
Change of working length (mm) in three groups

SD, standard deviation; n, sample size.

jkacd-36-59-i002.jpg
Table 3
Mean and SD of transportation (mm) at different apical level

a,b, Groups with statistically significant differences (p < 0.05); SD, standard deviation.

jkacd-36-59-i003.jpg

Tables & Figures

REFERENCES

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    • 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
      Restorative Dentistry & Endodontics.2014; 39(1): 7.     CrossRef

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      Comparison of apical transportation and change of working length in K3, NRT AND PROFILE rotary instruments using transparent resin block
      J Korean Acad Conserv Dent. 2011;36(1):59-65.   Published online January 31, 2011
      DOI: https://doi.org/10.5395/JKACD.2011.36.1.59
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    Figure
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    Comparison of apical transportation and change of working length in K3, NRT AND PROFILE rotary instruments using transparent resin block
    Image Image Image Image
    Figure 1 Photograph of a jig that maintains a constant distance between a X-ray tube and a resin block.
    Figure 2 Photograph of a resin block and a digital sensor. (a) Holding part of digital radiographic sensor. (b) Cartesian system. (c) Table for constant position of resin block.
    Figure 3 (a) Initial X-ray. (b) X-ray after canal enlargement. (c) Image of the x-ray after canal enlargement processed by Adobe photoshop.
    Figure 4 (a) Image of central axis. (b) Measurement of apical transportation using AuotCAD 2000.

    Figure 1

    Figure 2

    Figure 3

    Figure 4

    Comparison of apical transportation and change of working length in K3, NRT AND PROFILE rotary instruments using transparent resin block

    Mean curvature and working length in three groups

    W.L, working length; n, sample size.

    Change of working length (mm) in three groups

    SD, standard deviation; n, sample size.

    Mean and SD of transportation (mm) at different apical level

    a,b, Groups with statistically significant differences (p < 0.05); SD, standard deviation.
    Table 1 Mean curvature and working length in three groups

    W.L, working length; n, sample size.

    Table 2 Change of working length (mm) in three groups

    SD, standard deviation; n, sample size.

    Table 3 Mean and SD of transportation (mm) at different apical level

    a,b, Groups with statistically significant differences (p < 0.05); SD, standard deviation.

    Table 1

    Table 2

    Table 3

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