A Randomized Controlled Clinical Study aims for Clinical Assessment of CAD/CAM Fabricated Lithium-Disilicate overlay in comparison to Lithium-disilicate Endocrowns for Restoration of Endodontically Treated Teeth.

Investigators are going to compare the clinical behavior of the lithium disilicate overlay as a more conservative line of treatment for endodontic treated teeth. overlays will be compared to the lithium disilicate endocrowns .primary outcome will be marginal adaptation ,secondary outcomes will be survival and patient satisfaction . Baseline, 5, 10, 15, and 20 months follow up will extend to 20 months(Baseline, 5, 10, 15, and 20 months) .This is a randomized, controlled, parallel-group clinical trial with 1:1 allocation ratio.

Inclusion Criteria:

• Patients with endodontically treated teeth indicated to ceramic Endocrowns.
• Patients with endodontically treated teeth indicated to ceramic overlays.
• Physically and psychologically able to tolerate conventional restorative procedures.
• Have no active periodontal or periapical diseases.
• Maintenance of good oral hygiene.
• Willing to return for follow-up examinations and evaluation.

Exclusion Criteria:

• Patients in the growth stage with partially erupted teeth.
• Patients with para-functional habits.
• Patients with defective endodontic treatment.
• Patients with poor oral hygiene and motivation.
• Psychiatric problems or unrealistic expectations.