Regarding the influence on the accuracy of the implant position within the dental arch, the current study found that the implant position in the dental arch had no influence or impact on impression accuracy, similar to the report by Gallucci et al. [24]. However, and in contrast, Papaspyridakos et al. found that the position in the dental arch influenced accuracy [22]. However, the Papaspyridakos et al. study involved utilizing the open tray technique only and used splinted impression copings. Furthermore, polyether impression was the material used in their study, and accuracy evaluation was through superimposition of optical scans, and perhaps, these differences may have contributed to the variance in outcomes.

There is currently an increase in the use of digital impressions in dentistry. In a recent systematic review comparing digital and conventional impressions, out of 10 articles, 5 encouraged the use of intraoral scanners in the implant field, while two studies found that digital scanning is not reliable and could not be used in clinical practice. However, it is still early to conclude whether to use digital scanners in implant dentistry as standard procedure and further studies should clarify this issue [25].

The current study generally found no statistically significant differences in the marginal discrepancy between both impression techniques. This is contrary to the findings of Papaspyridakos et al., where statistically significant differences were found concerning marginal discrepancy between the groups studied [26].

Any stage of implant prosthesis fabrication may contribute to positional distortion or imprecision. Decreasing distortion factors in the horizontal and vertical dimensions may reduce the potential on impression misfits of the implant superstructures. Several methods may be used to evaluate the presence or absence of marginal discrepancy; in the current study, the one screw test with a verification jig was used, since it has been widely used to determine marginal discrepancies [15, 27,28,29].