Mariam Adel Hosny Mohamed, Rasha Mohamed Abdel Raouf And Nour El Din Ahmed Habib,

ABSTRACT


Aim: Investigate Low Temperature Degradation (aging ) Effect Of Three Ceramic CAD/CAM Block Materials: Lithium Disilicate(LD), Translucent Zirconia(TZ) And Zirconia Reinforced Lithium Silicate(ZLD) On Their Flexure Strength.

Materials and Methods: Fourteen Disc Shaped Specimens Were Prepared From Each Material(12mm Diameter And 1.2 Mm Thickness). Seven Specimens Per Material Were Subjected To Low Temperature Degradation. While The Other Seven Were Considered As Control. All Specimens Were Subjected To Biaxial Flexure Strength Testing.

Results: TZ Had The Highest Flexure Strength While There Was No Difference Between The Others. Flexure Strength Of The Three Materials Was Not Affected By Aging

Conclusions: Aging Did Not Affect The Flexure Strength. Translucent Zirconia Has The Highest Flexure Strength While No Difference Between Lithium Disilicate And Zirconia Reinforced Lithium Silicate.