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HOME > Restor Dent Endod > Volume 35(6); 2010 > Article
Basic Research In vivo evaluation of accuracy and consistency of two electronic apex locators
Chien-Yun Pi, DDS1, Euiseong Kim, DDS, MSD, PhD2, Il-Young Jung, DDS, MSD, PhD2, Seung-Jong Lee, DDS, MSD, PhD2
2010;35(6):-460.
DOI: https://doi.org/10.5395/JKACD.2010.35.6.453
Published online: November 30, 2010

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Correspondence to Seung-Jong Lee, DDS, MSD, PhD. Professor, Department of Conservative Dentistry, Yonsei University College of Dentistry, 250 Seongsanno, Seodaemun-gu, Seoul, Korea 120-752. TEL, +82-2-2228-3148; FAX, +82-2-313-7575; sjlee@yuhs.ac
• Received: July 15, 2010   • Revised: September 15, 2010   • Accepted: September 27, 2010

Copyright © 2010 Korean Academy of Conservative Dentistry

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  • Objectives
    To evaluate the accuracy and consistency of two different apex locators at both the Apex and 0.5 marks.
  • Materials and Methods
    Twenty-six root canals was scheduled for extraction for periodontal or prosthodontic reasons. Thirteen canals were measured using Root ZX and the rest by i-ROOT. The root canal length was measured both the at 0.5 mark and the Apex mark. The file was then fixed to the tooth, and the distance from the file tip to the major foramen of each canal was measured after removing the root dentin under the microscope so that the major foramen and the file tip were seen.
  • Results

    1. When the Apex mark was used, 100% of both the Root ZX and i-ROOT groups were within 0.5 mm of the major foramen.

    2. When 0.5 mark was used, 100% of the Root ZX group and 77% of the i-ROOT group were within 0.5 mm of the major foramen.

    3. In terms of standard deviation and quartile value, the Apex mark was more consistent than 0.5 mark in the Root ZX group, and 0.5 mark was more consistent in the i-ROOT group, but there was no statistically significant difference when compared with t-test.

    4. The root canal length difference between the Apex mark and 0.5 mark was 0.22 mm and 0.46 mm in the Root ZX and i-ROOT groups, respectively.

  • Conclusions
    In this study, the Apex mark was the more consistent mark. Therefore, it is recommended to subtract 0.5 mm, which is the average length between the apex and apical constriction, from the root canal length at the Apex mark to obtain the working length clinically.
  • Keywords: Accuracy; Consistency; Electronic apex locator; Microscope
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Figure 1
Root ZX
jkacd-35-453-g001.jpg
Figure 2
i-ROOT
jkacd-35-453-g002.jpg
Figure 3
Length measurements with digital caliper.
jkacd-35-453-g003.jpg
Figure 4
Distance between file tip and major foramen under I-solution program (Microscope image).
jkacd-35-453-g004.jpg
Figure 5
Box plots: Quartile value of file tip and major foramen distance at 0.5 mark and the Apex mark.
jkacd-35-453-g005.jpg
Table 1
Distance between file tip and major foramen at 0.5 mark and the Apex mark (mm), according to measurement Microscopic image
jkacd-35-453-i001.jpg

Tables & Figures

REFERENCES

    Citations

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    • Influence of Apical Periodontitis on the Accuracy of 3 Electronic Root Canal Length Measurement Devices: An In Vivo Study
      Masoud Saatchi, Mohammad Ghasem Aminozarbian, Seyed Mohsen Hasheminia, Amin Mortaheb
      Journal of Endodontics.2014; 40(3): 355.     CrossRef

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      In vivo evaluation of accuracy and consistency of two electronic apex locators
      J Korean Acad Conserv Dent. 2010;35(6):453-460.   Published online November 30, 2010
      DOI: https://doi.org/10.5395/JKACD.2010.35.6.453
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    Figure
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    In vivo evaluation of accuracy and consistency of two electronic apex locators
    Image Image Image Image Image
    Figure 1 Root ZX
    Figure 2 i-ROOT
    Figure 3 Length measurements with digital caliper.
    Figure 4 Distance between file tip and major foramen under I-solution program (Microscope image).
    Figure 5 Box plots: Quartile value of file tip and major foramen distance at 0.5 mark and the Apex mark.

    Figure 1

    Figure 2

    Figure 3

    Figure 4

    Figure 5

    In vivo evaluation of accuracy and consistency of two electronic apex locators

    Distance between file tip and major foramen at 0.5 mark and the Apex mark (mm), according to measurement Microscopic image
    Table 1 Distance between file tip and major foramen at 0.5 mark and the Apex mark (mm), according to measurement Microscopic image

    Table 1

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