الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
 |  | from | 184 |  |  |
| | | from | 184 | | |
Abstract
This was a non- randomized in-vitro study, in which an edentulous mandibular master model was designed following the All-on-4 concept, with recesses of digital implant analogs. The analogs were located in anterior and posterior regions using computer aided design software. The master model was 3D printed by Digital Light Processing (DLP). After which, the accuracy of intraoral scanner was assessed at varied interimplant distances and distal abutment angulation.
The intervention to evaluate the effect of interimplant distance on scanner accuracy were the long and short interimplant distance group. The short interimplant distance group had the most distal implant at the first premolar region. The long interimplant distance group had the most distal implant at the second premolar region instead. Both the short and long interimplant distance groups had three subgroups with varied distal multi-unit abutment angulation 0, 15, 30- degrees. Intraoral scan bodies were assembled over the multi-unit abutments for the scanning of the master model.
The master model was scanned once with a reference scanner for all groups to obtain the reference scan. The intraoral scanner was used to obtain 10 test scans for each group. Accuracy measurements using Medit design app feature, were performed by superimposition of the test scans over the reference scan of each group.
The deviation values of the test scans from the reference scan were used for statistical analysis. Results showed that as the interimplant distance had no effect on the accuracy. Also, an increase in the angulation negatively affected the accuracy of the intraoral scanner.