Effect of Geometric Modifications of Implant Scan Bodies

The aim of this study will be the effect of geometric modifications of implant scan bodies compared to conventional transfer techniques on passivity of all on four mandibular restorations. Evaluation method: The trueness of the final impression and the passivity of the final prosthesis will be evaluated by two methods: Invitro evaluation For each patient in every group, the standard tessellation language (STL) files of scanned impressions will be superimposed on the reference file to determine the 3D surface, linear, and angular position analysis. The STL files for both frameworks will be superimposed on the reference file to determine the passivity. In vivo (Clinical) evaluation Radiographic evaluation using long cone parallel technique will be done for the framework after 6 month (T6) after one year (T12), and after 18 month (T18) from insertion.