Fracture Strength After Fatigue Loading of Lithium Disilicate Pressed Zirconia Crowns

Lithium disilicate glass has more uniform crystalline phase distribution and better mechanical properties than feldspathic ceramic.1 However, only three-unit fixed partial dentures (FPDs) are recommended for missing tooth restoration from the anterior region to the second premolar.2 Yttrium oxide partially stabilized tetragonal zirconia polycrystalline (Y-TZP) was introduced to restorative dentistry as a core material for all-ceramic crowns because its mechanical properties are superior to those of all other ceramic systems.3 On the other hand, zirconia that is too white and opaque is limited by optical shortcomings and chipping of the veneered porcelain.4 To reduce the likelihood of chipping veneered zirconia crowns, it has been suggested that pressed veneers

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