The effect of early coronal flaring about apical extrusion of debris

Min-Kyung Kim; Jeong-Beom Min; Ho-Keel Hwang

doi:10.5395/JKACD.2004.29.2.147

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Original Article The effect of early coronal flaring about apical extrusion of debris: Min-Kyung Kim, Jeong-Beom Min, Ho-Keel Hwang; Journal of Korean Academy of Conservative Dentistry 2004;29(2):147-152.
DOI: https://doi.org/10.5395/JKACD.2004.29.2.147
Published online: March 31, 2004

Department of Conservative Dentistry, College of Dentistry, Chosun University, Korea.

Corresponding author: Ho-Keel Hwang. Department of Conservative Dentistry, College of Dentistry, Chosun University, 375 Susuk-dong, Dong-gu, Gwangju 501-759, Korea. Tel: 82-62-220-3840, Fax: 82-62-232-9064, rootcanal@hanmail.net

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Abstract
REFERENCES

Abstract

The purpose of this study was to investigate the quantity of debris which was extruded apically after canal instrumentation using different types of enlarging instrument in endodontic resin models.

Five groups of 9 endodontic resin models were instrumented using each different technique: hand instrumentation without early coronal flaring, hand instrumentation after early coronal flaring, and three nickel-titanium engine-driven instrumentations (Hero 642, Protaper, K³). Debris extruded from apical foramen during instrumentation was collected on preweighed CBC bottle, desiccated and weighted using electronic balance. The results were analyzed using Kruskal-wallis test and Mann-Whitney U rank sum test at a significance level of 0.05.

The results were as follows:
1. All of instrumentation techniques produced apically extruded debris.
2. Group without early coronal flaring extruded significant more debris than groups with early coronal flaring.
3. There was no significant difference among early coronal flaring groups.
The early coronal flaring is very important to reduce the amount of debris extruded apically.
Keywords: Apically extruded debris; Hand instrumentation; Hero 642; Protaper; K³; Early coronal flaring

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Figure 1

Resin block in stopper(a), CBC bottle(b), flask(c), and 23-gauge needle(d) before assembly

Figure 2

A device for collecting the debris extruded apically

Figure 3

Average weight of apically extruded debris in each group

Table 1

Group classification

Table 2

Average weights of apically extruded debris in each group (unit: mg)

S.D: Standard deviation

^*: Significantly different at p < 0.05 (Mann-Whitney test)

Tables & Figures

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