الفهرس 
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Abstract
Objective: This in vitro study was performed to evaluate the passive seating accuracy of screw retained implant-supported zirconia anterior fixed dental prosthesis with different abutment angulations. Materials and Methods: 50 Epoxy resin dental cast models were assigned into five equal groups (n=10) according to implant placement angulations and each model was received two implants with 4.0 mm diameter and 10 mm length: group 0-0: both implants were 0-degree angled (n=10), group 0-17.5: one implant was 0-degree angled while the other was 17.5-degree angled (n=10), group 0-35: one implant was 0-degree angled while the other was 35-degree angled (n=10), group 17.5-17.5: both implants were 17.5-degree angled (n=10), group 35-35: both implants were 35-degree angled (n=10). The models, with multi-unit abutments in place, were scanned and 3-units zirconia FDPs were designed and milled with the CAD-CAM system. Each zirconia FDPs were seated over its corresponding implants via prosthesis retaining screw. The gap at the abutment-zirconia FDPs interface was measured with stereomicroscope when only one screw was tightened, and when two screws was tightened. In the statistical comparison between the different groups, the significance of difference was tested using kruskal wallis to compare between more than two groups of numerical (non-parametric) data followed by post-hoc dunn’s. A p value <0.05 was considered statistically significant. Results: group (0-35) at the mid-labial reading showed significant increase in gap measurement compared to group (0-0) and group (17.5-17.5). group (35- 35) showed significant decrease compared with group (0-35) in gap measurement when canine tightened and central untightened. group (0-17.5), group (0-35) and group (35-35) at the mesio-labial reading showed significant increase compared with group (0-0) in gap measurement when central tightened Screen reader support enabled.