Thesis (Ph.D.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Prosthodontics

Zirconia became popular in dentistry because of this material{u2019}s excellent mechanical properties which include high strength, fracture toughness and biocompatibility.Zirconia was mainly used as a substructure for ceramic restorations and required veneering ceramics to obtain proper esthetics because of their high opacity. Despite the excellent physical properties of zirconia, veneer chipping has been identified as a major cause of failure.To overcome veneer chipping, dental manufacturers developed monolithic zirconia prostheses. One major concern with the use of monolithic zirconia as a restorative material is the abrasive nature and wear against opposing enamel because of this material{u2019}s hardness and surface roughness Therefor this study was carried out to clinically evaluate the wear behavior of human enamel and chipping of two ceramic materials for the posterior teeth. The examined materials were veneered zirconia 2Katana super translucent layered by feldspathic3 and monolithic zirconia 2Katana super translucent

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