The effect of early coronal flaring about apical extrusion of debris

Min-Kyung Kim, Jeong-Beom Min, Ho-Keel Hwang
2004 The Journal of Korean Academy of Conservative Dentistry  
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 nickeltitanium engine-driven instrumentations (Hero 642, Protaper, K 3 ). Debris extruded from
more » ... is 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. [J Kor Acad Cons Dent 29(2):147-152, 2004]
doi:10.5395/jkacd.2004.29.2.147 fatcat:474cue7eard4rpjo7vutabscqq