Effect of different impression techniques on marginal integrity of CAD-CAM milled all-on-four mandibular frameworks: an in vitro study.

Background: To guarantee a passive fit, full arch implant supported prostheses require scrupulous impressions. The accuracy of conventional and digital impressions is still up for debate, despite several studies comparing both acquisition techniques. The present study aimed to compare mandibular full arch implant impressions by assessing the vertical misfit of implant supported frameworks obtained through conventional and digital impressions.