근관의 치경부 조기 확대가 치근단 잔사 정출에 미치는 효과 = THE EFFECT OF EARLY CORONAL FLARING ABOUT APICAL EXTRUSION OF DEBRIS

다국어 초록 (Multilingual 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, K^(3)). 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 faring.
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.

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