Radwa A. Dardeer And Mervat I. Fawzy .,

ABSTRACT
Purpose Assessment Of The Surface Roughness Of Root Canal And Its Correlation With Bioceramic Sealer Bond Strength Following Final Irrigation By Chitosan. Material And Methods 50 Extracted Upper Centrals Were Selected And Prepared Using Universal ProTaper Rotary Files And 14 Ml 2.6% NaOCL Then The Samples Were Equally Distributed Into 2 Main Groups (20 Samples Each) Depending On The Type Of The Final Rinse. Group I: 0.2% Chitosan Acetate, Group II: 17 % Ethylenediamine Tetra Acetic Acid (EDTA), Control Group (10 Samples): Sterile Saline. Each Main Group Was Further Equally Distributed Into 2subgroups (10 Samples Each). Subgroup A: For Surface Roughness Evaluation. Subgroup B: For Push Out Bond Strength Evaluation. Surface Roughness Was Evaluated Using Digital Microscope. The Push Out Bond Strength Test Was Carried On Using Universal Testing Machine. The Sealer Penetration Inside The Dentinal Tubules Was Seen Under Scanning Electron Microscope (SEM) In Selected Samples. Results Regarding The Results Of Subgroup A, At All Levels, The Highest Value Of The Average Roughness Deviation (Ra) Was Recorded In Samples Treated With 17% EDTA, While The Lowest Value Was Recorded With The Saline Group And There Was No Statistical Significant Difference Among The Tested Groups. Regarding The Results Of Subgroup B, At All Levels, The Highest Median Push Out Bond Strength Was Recorded In Samples Treated With 17% EDTA, While The Lowest Value Was Recorded With The Saline Group And There Was No Statistical Significant Difference Among The Tested Groups Except At The Apical Levels Where The Difference Statistically Significant Among The Tested Groups. SEM Observation Of Sealer/ Dentin Interface Revealed Few Traces Of Sealer Penetration With Samples Treated With 17% EDTA And 0.2% Chitosan Acetate. Conclusion EDTA 17% As A Final Rinse Produced Higher Value Of Surface Roughness Compared To 0.2% Chitosan Acetate. The Push Out Bond Strength Results Of 0.2% Chitosan Acetate Was Comparable To That Of 17%EDTA When Applicated As A Final Rinse. There Is A Linear Relation Between Ra And The Push Out Bond Strength Of Bioceramic Sealer In Groups I, II.