Mohammed El-Desoki Fouda, Ahmed Atef El-souda And Amany E. Badr .,

ABSTRACT

Objectives: The Purpose Of This Study Was To Evaluate And Compare The Shaping Characteristic Of Different Rotary NiTi Systems (Hyflex EDM One File, Reciproc R25, Wave One Primary) In Extracted Human Teeth Using Cone Beam Computed Tomography Scanning (CBCT). Methods: Fourty Five Mesiobuccal Canals Of Mandibular Molars With Angle Of Curvatures Between 25-45 Degrees, Were Randomly Divided Into 3 Experimental Groups (n = 15), According To The NiTi Rotary System Used, Hyflex EDM, Reciproc R25 And WaveOne. All Canals Were Instrumented Using The Three Systems According To The Manufacture Instruction, Scanned Before And After Instrumentation By Using CBCT Scanner To Evaluate Canal Transportation And Centering Ratio At 3, 6 And 9 Mm From The Apex. Data Were Statistically Analyzed And The Significance Level Was Set At P< .05.

Results: At 3 Mm From The Apex, Hyflex EDM Showed The Lowest Significant Canal Transportation Value And The Highest Centring Ability Compared With Reciproc R25 And WaveOne Systems. No Significant Difference In The Amount Of Transportation And Centering Ability Between Reciproc R25 And WaveOne Systems. At The Level Of 6 Mm From The Apex, Hyflex EDM Showed The Lowest Significant Value Of Canal Transportation And Highest Centring Ability When Compared With Other Systems, And Reciproc R25 Showed Significantly Less Canal Transportation And More Centering Ability When Compared With WaveOne. At The Level Of 9 Mm From The Apex There Were No Significant Difference In The Amout Of Transportation And Centering Ability Between The Three Groups. Conclusion: Hyflex EDM System Showed The Least Canal Transportation And The Highest Centering Ability Followed By Reciproc R25 System While WaveOne System Produced The Highest Transportation And Lowest Centering Ability.