Importance of passive ultrasonic irrigation in cleaning the root canal

Background: The smear layer is formed by the rest of dentin and organic material, such as cellular waste vital or necrotic, bacteria and byproducts. It prevents the penetration of medicines intracanais and endodontic sealer in the Dentinal tubules and ramifications of the root canal system. Several techniques have been proposed and rinsing delivery devices to improve the distribution of the solution within the root canal system. The objective of this work was to compare the conventional irrigation technique the technique of passive ultrasonic irrigation for removal of debris tubules and smear layer. It was concluded that ultrasound enhances passive irrigation solution irrigating action decreasing the amount of dirt from the root canal system. Conclusion: The passive ultrasonic irrigation is more effective than the conventional ultrasonic irrigation and irrigation in the removal of debris and smear layer from root canals. Passive ultrasonic irrigation is not able to remove all the "debris" from the root canal but when used, significantly enhances cleaning of the root canal system.