The aim of the present study is to evaluate clinical behavior and patient satisfaction of Zirconia-reinforced lithium disilicate press ceramic crowns when used in a conservative marginal design(0.6mm chamfer finish line). Comparison with Ultratranslucent multilayered monolithic zirconiacrowns will also be carried out in terms of marginal integrity, fracture, color stability and gingival health for 12 month

• Select and examine patients based on inclusion/exclusion criteria, then obtain consent.

• Diagnose chief complaint, assess teeth in the esthetic zone, and perform scaling/polishing.

• Take primary impressions for study casts.

• Instruct patients to brush three times daily for good oral hygiene.

• Capture pre-op photos and radiographs.

• Choose the appropriate shade.

• Tooth Preparation:

  • Group 1: Ultra-translucent zirconia crown (CAD/CAM, 0.6mm chamfer).
  • Group 2: Zirconia-reinforced lithium disilicate crown (press, 0.6mm chamfer).

• Perform tissue retraction and take impressions with IOS.

• Create provisional crowns.

• Fabricate crowns (AMBRIA or KATANA zirconia) per manufacturer guidelines.

• Conduct try-in.

• Cement using light-cured resin adhesive.

• Assess restoration at 3, 6, 9 and 12 months for clinical behavior and patient satisfaction

Inclusion Criteria:

1. The age range of the patients from 21- 50 years old; able to read and sign the informed consent document; illiterate patients will be avoided.
2. Patients who can physically and psychologically tolerate conventional restorative procedures.
3. Patients with endodontically treated teeth indicated for ceramic crowns in the esthetic Zone (all axial walls existing).
4. Patients with no active periodontal or pulpal diseases.
5. Patients with teeth problems indicated for full coverage restoration in the esthetic zone (e.g.

moderate to severe discoloration, coronal chipping where partial coverage would lack retention, malposed or malformed teeth). 6. Patients willing to return for follow-up examinations and evaluation. 7. Patients that care for good oral hygiene Maintenance.

Exclusion Criteria:

1 Patients with poor oral hygiene and motivation. 2. high caries rate. 3. Patients with psychiatric problems or unrealistic expectations (patient that has phobia from dental treatments or needle bunch). 4. Patients suffering from parafunctional habits or temporomandibular disorders.

7. Patients with teeth have extensive tooth structure loss, even if one wall is missing.