Passive Ultrasonic Irrigation — NDEB AFK MCQ

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ModerateEndodonticsPassive Ultrasonic IrrigationNDEB AFK

Which endodontic irrigant activation technique uses ultrasonic energy to enhance debridement and disinfection within the root canal system?

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Correct answer: D — Passive ultrasonic irrigation (PUI)

Passive ultrasonic irrigation (PUI) uses an ultrasonically activated file or tip placed passively (without contact with the canal walls) into the irrigant-filled canal. The ultrasonic energy creates acoustic streaming and cavitation that significantly enhance: (1) penetration of NaOCl into lateral canals, fins, isthmuses, and dentinal tubules; (2) removal of the smear layer; (3) disruption of bacterial biofilm; and (4) debridement of debris from inaccessible areas. PUI after hand/rotary instrumentation has been shown to improve canal cleanliness beyond instrumentation alone.

Reference: Torabinejad – Endodontics: Principles and Practice, 6th ed., 2021