Ahmed Hassanein, Nihal Sabet And Mohamad Fakhr .,

ABSTRACT


Aim: Assess The Remaining Dentin Thickness During The Retrieval Of A Separated File Within A Root Canal Using Different Ultrasonic Tip Designs. Methods: 48 Extracted Maxillary Molars Having A Broken Rotary Nickle-titanium (NiTi) File In The Apical Third Of The Mesiobuccal Root Were Used In This Study. Teeth Will Be Divided Into Two Groups Of 24 Teeth Each; Group A, Non-diamond Coated E7 Endodontic Ultrasonic Tips Will Be Used To Retrieve The Separated Files. While Group B, Diamond Coated E7D Endodontic Ultrasonic Tips Will Be Used To Retrieve The Separated Files. Cone Beam Computed Tomography (CBCT) Scans Were Made Before And After The Procedure To Assess The Remaining Radicular Dentin Thickness In The Mesiobuccal Root At 3mm, 6mm, And 9mm From The Apex. Special Blocks Were Made Using Silicon Putty Impression Material To Standardize The Exact Position Of All The Samples During Pre-operative And Post-operative Dentine Thickness Measurements Using The CBCT Scanner. All Data Were Statistically Analysed.

Results: Group B Showed Statistically Significant Lower Remaining Dentine Thickness Than Group A At 3 Mm From The Apex. At 6 Mm And 9 Mm, There Was No Statistically Significant Difference Between Group A And Group B. Conclusion: Diamond Coated Ultrasonic Tips Are More Aggressive At Cutting The Radicular Dentinal Tissue Than Non-coated Ones. Water Coolant Does Not Affect The Amount Of Lost Radicular Dentine During Ultrasonic Activation.