J Korean Acad Conserv Dent.  2011 Jan;36(1):59-65. 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

Affiliations
  • 1Department of Conservative Dentistry, Yonsei University College of Dentistry, Seoul, Korea. andyendo@yuhs.ac
  • 2Department of Conservative Dentistry, Gangnam Severance Hospital, Yonsei University College of Dentistry, Seoul, Korea.

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.

Keyword

Apical transportation; K3; NRT; PROFILE; Working length changes

MeSH Terms

Dental Pulp Cavity
Nickel
Titanium
Transportation
Nickel
Titanium

Figure

  • 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.


Cited by  1 articles

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
Restor Dent Endod. 2014;39(1):7-11.    doi: 10.5395/rde.2014.39.1.7.


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