Patient Satisfaction and Crestal Bone Loss of Polymer Infiltrated Ceramic Network Versus Lithium Disilicate Implant Hybrid Abutment Crowns in Esthetic Zone

Inclusion Criteria: 1. Patients above 18 years old. 2. Patients able to read and sign the informed consent document. 3. Medically free patients or with controlled systemic disease. 4. Patients with good bone quality and quantity evaluated using C.B.C.T. 5. Patients willing to return for follow-up examinations and evaluation. 6. Patients having single missing recently extracted premolar tooth. Exclusion Criteria: 1. Young patients in growth stage. 2. Patients with unsuitable implantation sites (patients with major boney defects or sever bone resorption) 3. Pregnant women to avoid any complication that may occur in dental office. 4. Patients with uncontrolled systemic disease (hypertensive patient or uncontrolled diabetic patient) 5. Psychiatric problems or unrealistic expectations. 6. Multiple adjacent missing teeth. 7. Patients with bad oral hygiene. -