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KMID : 0362320110360010059
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Journal of Korean Academy of Operative Dentistry
2011 Volume.36 No. 1 p.59 ~ p.65
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Comparison of apical transportation and change of working length in K3, NRT AND PROFILE rotary instruments using transparent resin block
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Yoon Min-Jung
Song Min-Ju
Shin Su-Jung
Kim Eui-Seong
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Abstract
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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.
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KEYWORD
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Apical transportation, K3, NRT, PROFILE, Working length changes
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