Accuracy of digital implant impressions using a novel structured light scanning system assisted by a planar mirror in the edentulous maxilla: An in vitro study

Abstract

Objectives: This study aimed to develop a structured light scanning system with a planar mirror to enhance the digital full-arch implant impression accuracy and to compare it with photogrammetry and intraoral scanner methods. Materials and Methods: An edentulous maxillary stone cast with six scan bodies was scanned as the reference model using a laboratory scanner. Three scanning modalities were compared (n = 10): (1) self-developed structured light scanning with a mirror (SSLS); (2) intraoral scanner (IOS); and (3) photogrammetry system (PG). The scanners were stopped for 1 min after each scan. Six scan bodies were analysed within each scan model. Linear deviations between the scan bodies (1–2, 1–3, 1–4, 1–5, and 1–6) and 3D mucosal deviations were established. The overall deviation was calculated as the mean of all linear deviations. “Trueness” represented the discrepancy between the test and reference files, while “precision” denoted the consistency among the test files. Kruskal–Wallis and Mann–Whitney U tests were used for statistical analyses. Results: Significant overall linear discrepancies were noted among the SSLS, PG, and IOS groups (p