This Study Will be Directed Toward Evaluating Peri-implant Tissue Behavior, Pink Esthetic Score, Patient Satisfaction and Marginal Accuracy Associated With Biologically Oriented Preparation Technique for Implant Supported Crowns.

patients will be divided into two groups (n=10) according to the type of abutment used: Group (1): will receive conventional shoulder abutment. Group (2): will receive customized titanium biologically oriented prepared abutments or shoulderless abutments that are prepared in the same manner as the natural abutment teeth in the BOPT protocol Construction of the crowns: Patients in both groups will receive porcelain fused to metal crowns. Assessment of: Soft tissue thickness Hard tissue thickness Marginal discrepancy Pink esthetic score Patient satifaction