Influence of scan aid surface color on accuracy of calibrated intraoral scan protocol in complete arch implant digital scans

作者：Zhaozhao Chen, Jiayi Yu, Jiayi Lu, Hom‐Lay Wang, Junying Li · 发表于：Journal of Prosthetic Dentistry · 年份：2025 · DOI：10.1016/j.prosdent.2025.09.006 · 被引用次数：4 · 研究领域：Dental Implant Techniques and Outcomes、Dental materials and restorations、Reconstructive Facial Surgery Techniques

STATEMENT OF PROBLEM: Intraoral scans for complete arch implant-supported prostheses have been considered to lack sufficient accuracy for clinical use. Although various scan aids and techniques have been proposed, their effectiveness is still unclear. However, a calibrated intraoral scanning protocol (CISP) has shown accuracy comparable with that of the conventional splinted open-tray method. PURPOSE: The purpose of this in vitro study was to evaluate the impact of scan aid color on the accuracy of the CISP for complete arch implant-supported prostheses. MATERIAL AND METHODS: A maxillary edentulous model with 6 implants and multi-unit abutments was scanned using 3 approaches: intraoral scan (IOS), intraoral scan with scan aid (IOS-SA), and CISP. Scan aids in 3 colors (gray, tan, and white) were applied in the IOS-SA and corresponding CISP groups. In the CISP group, the scans were further calibrated with a desktop scan of the scan aid. Each approach was repeated 10 times, and a desktop scan served as the reference model. The scans were aligned with the reference model using 2 approaches: one assessed the overall fit by aligning all scan bodies, and the other simulated the Sheffield fit test by aligning only the first and second scan bodies (SB1 and SB2) to evaluate passive fit in multiple implant-supported prostheses. Linear deviations from the reference model (trueness) and deviations within each group (precision) were analyzed via Python scripts. The accuracy (trueness and p...