Mohmmed Harris, Magdy Mohammed And Reham Hassan .,

ABSTRACT
The Aim Of The Study Was To Compare Between XP Finisher File, XP Finisher R File And Passive Ultrasonic Irrigation On The Removal Of Smear Layer After Root Canal Retreatment. A Total Of 75 Single Rooted Human Mandibular Premolars Were Decoronized, Instrumented Using I-Race Rotary Files And Filled With Warm Gutta-percha And Total Fill Bioceramic Sealer Using Vertical Condensation Technique. Retreatment Was Performed With D-Race Rotary Files With The Help Of Gutta-percha Solvent. Samples Were Divided Into Three Experimental Groups And Two Control Groups (positive And Negative) After The Removal Of Filling Material According To Irrigation Protocol; Group A(positive Control), Group B(negative Control), Group C(XP Finisher), Group D(XP Finisher R), Group E(Passive Ultrasonic Irrigation) . Samples Were Sectioned Longitudinally And Prepared For Scanning Electron Microscope (SEM) To Evaluate Smear Layer Removal. The Percentages Of Cleaned Canal Walls In Each Third Of The Canal Were Determined Using Image J Software. Data Were Collected And Statistically Analyzed. Results Showed That None Of The Experimental Irrigation Techniques Used Resulted In Complete Canal Cleanliness. However Xp Finisher R File And Xp Finisher Fileshowed Better Cleaning Ability To Remove Smear Layer Compared To Passive Ultrasonic Irrigation In All Thirds Of Each Root Canal.