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A study of insertion depth of gutta percha cones after shaping by Ni-Ti rotary files in simulated canals


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A study of insertion depth of gutta percha cones after shaping by Ni-Ti rotary files in simulated canals

Article information

Restor Dent Endod. 2007;32(6):550-558
Publication date (electronic) : 2007 November 30
doi : https://doi.org/10.5395/JKACD.2007.32.6.550
Hyun-Gu Cho, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh
Department of Conservative Dentistry, School of Dentistry, DSRI, 2nd stage of BK21, Chonnam National University, Korea.
Corresponding Author: Won-Mann Oh. Dept. of Conservative Dentistry, School of Dentistry, Chonnam National Universtiy 8 Hak-dong, Dong-gu, Gwangju, 501-757, Korea. Tel: 82-62-220-4431, Fax: 82-62-225-8387, wmoh@chonnam.ac.kr
Received 2007 October 10; Revised 2007 October 27; Accepted 2007 November 06.

Abstract

The purpose of this study was to evaluate the insertion depth of several brands of master gutta percha cones after shaping by various Ni-Ti rotary files in simulated canals.

Fifty resin simulated J-shape canals were instrumented with ProFile, ProTaper and HEROShaper. Simulated canals were prepared with ProFile .04 taper #25 (n = 10), .06 taper #25 (n = 10), ProTaper F2 (n = 10), HEROShaper .04 taper #25 (n = 10) and .06 taper #25 (n = 10). Size #25 gutta percha cones with a .04 & .06 taper from three different brands were used: DiaDent; META; Sure-endo. The gutta percha cones were selected and inserted into the prepared simulated canals. The distance from the apex of the prepared canal to the gutta percha cone tip was measured by image analysis program.

Within limited data of this study, the results were as follows

1. When the simulated root canals were prepared with HEROShaper, gutta-percha cones were closely adapted to the root canal.

2. All brands of gutta percha cones fail to go to the prepared length in canal which was instrumented with ProFile, the cones extend beyond the prepared length in canal which was prepared with ProTaper.

3. In canal which was instrumented with HEROShaper .04 taper #25, Sure-endo .04 taper master gutta percha cone was well fitted (p < 0.05).

4. In canal which was instrumented with HEROShaper .06 taper #25, META .06 taper master gutta percha cone was well fitted (p < 0.05).

As a result, we concluded that the insertion depth of all brands of master gutta percha cone do not match the rotary instrument, even though it was prepared by crown-down technique, as recommended by the manufacturer. Therefore, the master cone should be carefully selected to match the depth of the prepared canal for adequate obturation.

Keywords: Ni-Ti file; Resin simulated canal; Gutta percha cone; Insertion depth

References

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Article information Continued

Copyright © 2007 Korean Academy of Conservative Dentistry
(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.

Figure 1

Figure 1

Diagrammatic representation of tapered sized cones and measurement sites for diameter (D0) and taper (D3 and D16). (Adapted from ANSI/ADA Specification No. 78.)

Figure 2

Figure 2

A scanned image of a gutta percha cone was inserted into shaped canals.

Figure 3

Figure 3

The distance from the apex of the prepared canal to the gutta percha cone tip was measured by an image analysis program (Image-Pro EXPRESS, MediaCybernetics, USA).

Figure 4

Figure 4

Distance from the apex of the prepared canal to the gutta percha cone tip according to the gutta percha cone brands. *indicates statistically significant difference between the brands of gutta percha cone (p < 0.05).

PF .04: finally preparation with ProFile .04 #25 file.

PT: finally preparation with ProTaper F2.

HS .04: finally preparation with HEROShaper .04 #25 file.

Figure 5

Figure 5

Distance from the apex of the prepared canal to the tip of gutta percha cone according to the gutta percha cone brands. *indicates statistically significant difference between the brands of gutta percha cone (p < 0.05).

PF .06: finally preparation with ProFile .06 #25 file.

PT: finally preparation with ProTaper F2.

HS .06: finally preparation with HEROShaper .06 #25 file.

Table 1

Mean diameter (D0) of size #25 GP cone Mean ± S.D. (mm)

Table 1

Table 2

Mean taper of size #25 GP cone Mean ± S.D.

Table 2

*indicates statistically significant effect of brand on the cone taper.

Other letters mean significant difference (p < 0.05).

Table 3

Mean distance values Mean ± S.D. (mm)

Table 3

Values: Distance from the apex of the prepared canal to the gutta percha cone tip.

Minus values indicate that the master cones failed to go to the prepared length.