Fig. 4
From: Trueness and precision of digital implant impressions by intraoral scanners: a literature review
Schematic image showing positional shift of test data towards reference data through a best-fit algorithm. Due to its calculation methodology, the best-fit algorithm aligns test data with the reference data as closely as possible to its theoretical counterpart. Therefore, the actual positional relationship between the reference data and test data may deviate much more, and the deviation between the images may be underestimated