J Korean Acad Conserv Dent.  2004 Mar;29(2):147-152. 10.5395/JKACD.2004.29.2.147.

The effect of early coronal flaring about apical extrusion of debris

• Kim MK
• Min JB
• Hwang HK

• KMID: 1987088
• DOI: http://doi.org/10.5395/JKACD.2004.29.2.147

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.

Keyword

Apically extruded debris; Hand instrumentation; Hero 642; Protaper; K3; Early coronal flaring

MeSH Terms

Dental Instruments
Tooth Apex

Figure

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  Figure 1 Resin block in stopper(a), CBC bottle(b), flask(c), and 23-gauge needle(d) before assembly

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  Figure 2 A device for collecting the debris extruded apically

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  Figure 3 Average weight of apically extruded debris in each group

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