Ahmed Hassan Omran, Mohamed Farag Ayad And Amany Mohamed Korsel,

ABSTRACT


Purpose: Study Was Performed To Evaluate The Fracture Resistance Of Flared Root Canals Restored With Hybrid Ceramic Dowel And Core.

Materials and Methods: Two Techniques Were Used For Fabrication Of Dowel And Core. Group I (control), Casted Using Ni-Cr Metal Alloy. Group II (experimental Group), CAD/CAM Using Vita Enamic Hybrid Ceramic. 10 Specimens Were Fabricated Using Each Technique. Complete Cast Crowns Were Used To Restore All Specimens. Specimens Were Fixed In Acrylic Resin Cylinders, Then Positioned In The Mounting Device And Aligned At A 135� Angle With Respect To The Long Axis Of The Root In An Instron Testing Machine. Compressive Load Applied Palatally To All Specimens Till Fracture. Data Were Analyzed And Kolmogorov-Smirnov Test Was Used To Verify The Normality Of Distribution. Student T-test Was Used To Compare The Results Of The Tested Groups At Level Of Significance� 0.05.

Results: There Was A Significant Difference Between The Two Groups (p�0.05). The Results Revealed That Cast Dowel And Core Made From Ni-Cr Metal Alloy Had Higher Fracture Resistance (403.39 � 60.93 N) Than Dowel And Core Made From Vita Enamic Hybrid Ceramic (240.27�69.12 N). Conclusion: The Difference In Fracture Resistance Results Between The Cast Metal And The Hybrid Ceramics Dowels And Cores Were Significant. The Highest Values Recorded For The Cast Metal Group. The Two Tested Groups Showed Acceptable Fracture Resistance Values Which Can Withstand Normal Adult Occlusion Force Especially In The Anterior Teeth.