الفهرس 
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Abstract
This study was designed to compare the accuracy of cast obtained from
the un-splinted open tray implant impression technique to that obtained from
digital impressions with different implant angulations.
Two mandibular completely edentulous epoxy resin models (A, and B)
representing a clinical situation- will be used as definitive models, model (A)
with four implant analogues arranged to be parallel to each other, and
perpendicular to the plane of the model, 2 analogues at the canine region and
2 at the first molar region, model (B) with 4 implant analogues with different
angulation; 2 analogues at the canine region with 15º angles, and 2 at the fir
molar region with 30º angles, and impressions for the models was performed
using two techniques 15 times for each model: 1) un-splinted direct
impression technique, 2) digital impression using an extra-oral scanner. Then measuring of casts obtained from digital and conventional by coordinate
measuring machine and geomagic software