الفهرس 
Comparison Of Postoperative Pain And Healing After Passiive Ultrasonic Irrigation And Needle Irrigation In Patients With Apical Periodontitis : A Randomized Clinical Trial
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Abstract
This randomized clinical study compared the effect of passive-ultrasonic irrigation (PUI) versus needle irrigation (NI) on postendodontic pain and periapical healing in mandibular, posterior teeth with non-vital pulp and apical periodontitis treated in a single visit.
Methodology: Sixty-six patients were randomly assigned to two groups based on the final irrigation methods: PUI, where the irrigant was delivered using a 29-G end-vent needle and activated using a U file tip and NI, where the irrigant was delivered using 29-G end-vent needle irrigation. Postendodontic pain incidence and intensity were assessed after 6, 12, 24, 48, and 72 hours and 1 week using a numerical rating scale (NRS) and periapical healing was assessed at 3, 6, 9 and 12 months after root canal treatment using the periapical index ( PAI).
Results: Both groups were similar for all baseline characteristics (p >0.05). At the 6h, 72h and 1 week time intervals, none of the participants in the two groups felt pain. At 12 h and 24 h there was no statistically significant difference in postoperative pain incidence between the two groups (p >
0.05). Eight patients were lost to follow up regarding preiapical healing. There was no statistically significant difference in median PAI scores between the two groups, however, there was a statistically significant decrease in PAI scores by time in both groups.
Conclusions: Both PUI and NI had similar effects on postendodontic pain and periapical healing in mandibular, posterior teeth with non-vital pulp and apical periodontitis treated in a single visit.