مدى نجاح استخدام الرأس فوق الصوتي E4 في إزالة أدوات المعالجة اللبية الدوارة (نيكل تيتانيوم)‎ من الأقنية الجذرية : دراسة مخبرية

الملخص EN

Introduction: Nickel Titanium instruments are widely used in the context of endodontic treatment of root canals.

Despite the multitude positives of nickel titanium files which excels outweigh the stainless steel files, they may often be exposed to fracture within the root canal.

Hence there was a great need to remove the separated endodontic instruments from root canals.

Ultrasonic tips are utilized to remove separated instruments from root canals.

This study aims to evaluate: 1- the effectiveness of the ultrasonic tip E4 in the removal of separated instruments from root canals, 2- The effect of the root canal shape on the success of the removal of separated instruments, and 3- the effect of the separated instruments site within the root canal on the success of removing them from the root canals.

Material and methods: The study included 50 extracted upper premolars with two detached roots and complete apex.

the crown has been cut and the root was fixed with silicon.

Only the palatal root was used in this study.

The roof of the pulp chamber was removed and the canals were prepared using ProTaper preparation system until the F2 file, a groove was made 3 mm from F2 file apex and was broken in the palatal canal.

Results: The study showed the success of the attempt to remove the separated endodontic instrument from root canal in the group without curvature, as greater than that in the root canal in the group with curvature.

The study also showed that the success or failure of the attempt to remove the endodontic instrument separated in apical third group was smaller than that in premolars group with separated instruments in the middle third The study hasn’t yielded a difference in the success of the attempt to remove the endodontic instrument and its failure between premolars group with separated instrument before the canal curvature and premolars group with separated instrument after the canal curvature.

Conclusion: The ultrasonic tip E4 proved highly effective in the removal of separated instruments from root canals, the proportion of separated instruments removal before curvature was larger than them after curvature, and the percentage of separated instruments removal in middle third was larger then that in the apical third