Precision Test of a Multi-Functional Scan Body for the Scan and Cross-Mount of an Edentulous Arch: A Pilot Case-Control Study.

Objective: The primary goal of this pilot study was to evaluate the three-dimensional comparisons of an intraoral digital scan utilizing a custom multifunctional scan body against the digitized stone models fabricated from a conventional open tray impression of fully edentulous maxilla and mandible in order to test the scan body's precision. The secondary goal of this study was to showcase a method for utilizing the scan body library to generate a fixed fiducial marker for the cross-mount of an edentulous arch. Design: Comparative analysis was performed as a case-control study. Methods: The custom scan body was utilized to generate the positions of the titanium bases from the intraoral models and digitized stone models of three maxillary arches (All-On-6, All-On-5, and All-On-4) and two mandibular All-On-4 arches. The titanium base positions were compared using advanced 3D inspection software. Results: The mean±SD was found to be 30.38±17.78 μm (95% CI: [14.8-45.97 μm]). The mean±SD of the maxilla was 38.73±19.24 μm (95% CI: 16.96-60.5 μm), and the mean±SD of the mandible was 17.85±0.92 μm (95% CI: 16.58-19.12 μm). Conclusion: The study's promising results demonstrated that deviations between the intraoral impressions and the digitized stone models fell within established tolerance ranges. Initial studies showed promising results that the digital workflow could be implemented with similar success as the conventional approach. The usage of the scan body library to generate a fiducial marker successfully demonstrated an efficient method for cross-mounting the edentulous arch.