Clinical wear and quality assessment of monolithic and lithium disilicate layered zirconia restorations.

Background: Wear and quality assessments of translucent monolithic zirconia and CAD-on restorations were performed.

Methods: Forty 3-unit posterior fixed partial denture (FPD) in 18 patients (age:18-50 years) were made from translucent monolithic zirconia (tm) (Zenostar T) and zirconia-frameworked, lithium disilicate layered (c) (CAD-on), materials in a split-mouth design. Restorations were digitally fabricated and their internal and marginal adaptations were measured before cementation followed by luting (Multilink Speed).