Maram H. Abdelwahab, Nihal E. Sabet And Mohammed M. Nagy,

ABSTRACT


Aim: The Aim Of The Current Study Was To Assess The Concept Of Single File (Wave One-Wave One Gold) Versus Multiple Files (Protaper Universal Retreatment System) In Retreatment Procedure Regards Remaining Filling Material.

Materials and Methods: Forty-five Extracted Human Mandibular Molars With Completely Formed Apices And Root Curvature Ranging From 20-45 Degrees Were Selected From Outpatient Misr International University Clinic Of Surgery Department. Samples With Intact No Visible Cracks Or Fractures Were Selected. Samples Were Digitally Radiographed And Examined For Any Calcifications Or Resorption In Roots. Teeth With Severe Curvature Or Root Caries Were Excluded. Soft Tissue And Calculus Deposits Were Removed Using Ultrasonic Scalers, Then Autoclaved And Stored In 0.2% Thymol. Occlusal Surface Was Flattened By Safe Sided Diamond Discs To Obtain 15mm Working Length. Mesiobuccal Canals Were Prepared With Protaper File System Up To Size F2 Using X Smart Plus Electric Motor According To Manufacture Instruction. At Each Instrument Change Irrigation Was Done With 10 ML Of 2.5% NaOCl Solution Delivered Using Syringe 27-gauge Needle, When Instrumentation Of Root Canal Is Finished, 17% Ethylenediaminetetraacetic Acid (EDTA) Was Used To Remove The Smear Layer And Finally Washed Using Distilled Water (5 ML) So As To Eradicate Solution Used. Final Dryness Was Performed Using Paper Points. All Samples Were Obturated By Gutta-percha Master Cone Size F2 Protaper Guttapercha And Auxillaries #25 And AH Plus Sealer Using Lateral Compaction Technique With Spreader Shorter Than Working Length By 2mm. Samples Were Sectioned Into Two Halves Mesial And Distal, Distal Roots Were Discarded And Mesiobuccal Canal Marked With Blue Marker For Cone Beam Computed Tomography Scanning.

Results: Area Fraction Results Showed That There Was A Statistically Significant Difference Between Groups In Which Wave One Gold Recorded The Highest Area Fraction Followed By Wave One Followed By Protaper Retreatment. Conclusion: The Rotation Motion Proved To Be More Efficient In Retreatment Procedure.