Pink and White Esthetic Scores of Polymer-infiltrated-ceramic-network and Lithium Disilicate Implant Hybrid Abutment Crowns

Inclusion Criteria: * Literate, capable of reading and signing the informed consent document * Healthy, free from or with controlled systemic disease * With acceptable oral health to support implant restorations * With good bone quality and quantity * Cooperative, accepting follow up and maintenance sessions * Having single missing tooth in esthetic zone Exclusion Criteria: * Under 18 years old * Illiterate, unable of comprehending or signing the informed consent document * Unhealthy with uncontrolled systemic disease * Pregnancy * With unfavorable oral state that might affect implant procedure and restoration * Uncooperative, not willing to return for follow up visits