A study of histomorphological change of curved root canal preparation using GT rotary file, profile and stainless steel K-file

Hyung-Jung Ko; Seung-Ho Baek

doi:10.5395/JKACD.2002.27.6.612

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Ko and Baek: A study of histomorphological change of curved root canal preparation using GT rotary file, profile and stainless steel K-file

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2002; 27(6): 612-621.

Published online: 30 November 2002

DOI: https://doi.org/10.5395/JKACD.2002.27.6.612

A study of histomorphological change of curved root canal preparation using GT rotary file, profile and stainless steel K-file

Hyung-Jung Ko, Seung-Ho Baek

Department of Conservative Dentistry College of Dentistry, Seoul National University, Korea.

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The purpose of this study was to compare the histomorphological change of curved root canal preparation using GT rotary File, Profile .04 taper and stainless steel K-file. 45 mesial canals(over 20 degree) of extracted human mandibular first molars were mounted in resin using a modified Bramante muffle system and divided into three groups. The roots were cross-sectioned at 2.5mm, 5mm and 8mm levels from apical foramen. Tracings of the canals were made from preinstrumentation pictures of the cross section. The canals were prepared using a step-back technique with stainless steel K file(group 1), Profile .04 taper rotary file(group 2) and GT rotary file(group 3). Tracings of the prepared canals were made from postinstrumentation picture. Canal centring ratio, amount of transportation, area of dentin removed and shape of canal were measured and statistically were evaluated with Student-Newman-Keuls test using Sigma Stat(Jandel Scientific Software, USA).

The results were as followings:

1. Amount of transportation of group 2 was the lowest at apical part, but there was no statistical difference. The direction of transportation was the outside of curvature at apical part.

2. Centering ratio at the apical part of group 1 was the highest, and there was statistical differences between apical and middle part, apical and coronal part(p<0.05). Centering ratio at the middle part of group 3 was the lowest, and there was statistical difference between apical and middle part(p<0.05). Centring ratio of group 2 was the lowest at apical part, but there was no statistical difference.

3. Amount of dentin removed of group 1 was the highest at coronal, middle and apical part among three groups, and there was statistical difference(p<0.05).

4. The majority of the cross-sectioned canal shape after instrumentation were irregular at coronal, middle and apical part. But there are more number of round shaped canals at group 3 than other group.

Figures and Tables

Fig. 1

Pre-instrumented canal at coronal part; Left; Group 1 (SS K file) Right; Group 3 (GT rotary file)

Fig. 2

Post-instrumented canal at coronal part; Left; Group 1 (SS K file) Right; Group 3 (GT rotary file)

Fig. 3

Pre-instrumented canal at middle part; Left; Group 1 (SS K file) Right; Group 3 (GT rotary file)

Fig. 4

Post-instrumented canal at middle part; Left; Group 1 (SS K file) Right; Group 3 (GT rotary file)

Fig. 5

Pre-instrumented canal at apical part; Left; Group 1 (SS K file) Right; Group 3 (GT rotary file)

Fig. 6

Post-instrumented canal at apical part; Left; Group 1 (SS K file) Right; Group 3 (GT rotary file)

Fig. 7

Pre-instrumented canal at coronal part; Left; Group 2 (Profile) Right; Group 1 (SS K file)

Fig. 8

Post-instrumented canal at coronal part; Left; Group 2 (Profile) Right; Group 1 (SS K file)

Fig. 9

Pre-instrumented canal at middle part; Left; Group 2 (Profile) Right; Group 1 (SS K file)

Fig. 10

Post-instrumented canal at middle part; Left; Group 2 (Profile) Right; Group 1 (SS K file)

Fig. 11

Pre-instrumented canal at apical part; Left; Group 2 (Profile) Right; Group 1 (SS K file)

Fig. 12

Post-instrumented canal at apical part; Left; Group 2 (Profile) Right; Group 1 (SS K file)

Table 1

(GG drill; Gates Glidden drill, MAF; master apical file, GTR file; GT Rotary ProFile)

Table 2

Table 3

Table 4

Table 5

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