Comparison of apical transportation and change of working length in K3, NRT AND PROFILE rotary instruments using transparent resin block.
10.5395/JKACD.2011.36.1.59
- Author:
Min Jung YOON
1
;
Min Ju SONG
;
Su Jung SHIN
;
Euiseong KIM
Author Information
1. Department of Conservative Dentistry, Yonsei University College of Dentistry, Seoul, Korea. andyendo@yuhs.ac
- Publication Type:Original Article
- Keywords:
Apical transportation;
K3;
NRT;
PROFILE;
Working length changes
- MeSH:
Dental Pulp Cavity;
Nickel;
Titanium;
Transportation
- From:Journal of Korean Academy of Conservative Dentistry
2011;36(1):59-65
- CountryRepublic of Korea
- Language:Korean
-
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.
