Marginal Vertical Discrepancies of Monolithic and Veneered Zirconia and Metal-Ceramic Three-Unit Posterior Fixed Dental Prostheses

T he combination of zirconia-based material with computer-aided design/computer-assisted manufacture (CAD/CAM) technology has increased the range of application of these materials in dentistry. Zirconia ceramic has excellent mechanical properties1 but is highly opaque, so the framework must be covered with veneering porcelain for a more acceptable esthetic outcome. Flowever, failure of the veneering porcelain has been identified as a common complication.2 Recently, monolithic zirconia restorations have been introduced as an alternative to zirconia veneered with feldspathic porcelain to eliminate chipping failures of veneer ceramics.

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