Wear Characteristics and Clinical Performance of Lithium Silicate Versus Monolithic Zirconia Crowns.

The aim of the present study is to evaluate the wear characteristics and clinical performance of lithium silicate crowns in comparison to monolithic zirconia crowns. The quality of the overall restorations as well as gingival tissues will be also evaluated according to modified United States Public Health Service (USPHS) criteria: (Marginal adaptation, color match, anatomic form, integrity of restoration, secondary caries, retention, tooth sensitivity, gingival index and periodontal index) at baseline, 6 months and 1 year