Evaluation of Antagonist Wear Behavior and Patient Satisfaction of Zirconia Reinforced Lithium Silicate Glass When Compared to Monolithic Zirconia

Inclusion Criteria: 1. Patient age range from 20-60 to be able to read and write in order to sign the informed consent document. 2. Patients physically and psychologically able to tolerate conventional restorative procedures. 3. Patients with no active periodontal and or pulpal diseases, having teeth with good restorations. 4. Patients with root canal treated teeth requiring full coverage restorations. 5. Patients indicated for full coverage (e.g. moderate to severe discoloration, coronal fracture, malposed or malformed teeth). 6. Patients willing to return for follow-up examinations and assessments Exclusion Criteria: 1. Patients in the growth stage with partially erupted teeth. 2. Patient with poor oral hygiene. 3. Patients with psychiatric problems or unrealistic expectations 4. Patient with no opposite occluding dentition in the area intended for restoration. 5. Patient suffering from Para functional habits.