الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This invitro trial was conducted to introduce and evaluate a new technique using CAD/CAM technology in the construction of 3D splint bar for using in splinted type of multi implant impression technique and to digitally assess positional implant transfer accuracy of impressions for completely edentulous arches obtained by this 3D printed splint bar and compare the results with those obtained with conventional methods.
This study was conducted on one mandibular epoxy model with 4 parallel implants and was used as master reference model. A total of 24 (n=24) open tray impressions were done using a custom-made tray and were poured in dental stone. Eight final impressions were done with 3D printed splint (group I), 8 were done with the conventional splinting method (group II), and 8 were done with sectional splinting method (group III). Four impression posts were attached to each cast, and all casts were scanned using a desktop scanner. Surface scans for the 3 groups were superimposed with the scan of the master reference model. The positional accuracy of each post was compared with the reference model to assess positional deviations. The 3D positional axes (XYZ) were recorded to evaluate the positional transfer deviation of the 3 studied groups.
At the same time, the anguler deviation at both vertical and horizontal relations were recorded and compared between the studied groups.