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

Min-Jung Yoon; Min-Ju Song; Su-Jung Shin; Euiseong Kim

doi:10.5395/JKACD.2011.36.1.59

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

Basic Research

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2011; 36(1): 59-65.

Published online: 31 January 2011

DOI: https://doi.org/10.5395/JKACD.2011.36.1.59

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

Clinical Researcher

Assistant Professor

Associate Professor

¹Department of Conservative Dentistry, Yonsei University College of Dentistry, Seoul, Korea.

²Department of Conservative Dentistry, Gangnam Severance Hospital, Yonsei University College of Dentistry, Seoul, Korea.

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 24 November 2010 Revised 5 January 2011 Accepted 7 January 2011

Abstract

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

Figures and Tables

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.

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.

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