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Updated: Jan 13, 2026
Measuring the Complete-arch Distortion of an Optical Dental Impression
Published on: May 30, 2019
Effect of a modified scanning technique on the accuracy of complete-arch implant scanning: an in vitro study
Luming Wei1, Jianhua Ji2, Xuzhe Zha2
1Department of Oral Implantology, The Affiliated Stomatological Hospital of Xuzhou Medical University, 130 Huaihai West Road, Xuzhou, 221003, PR China.
Background:
This in vitro study aimed to investigate the accuracy of a modified scanning technique that incorporated a simple scan aid (SSA) and a novel scanning pattern (segmented scanning pattern, SSP) for complete-arch implant scan.
Methods:
An edentulous maxillary stone cast with 4 parallel analogs was used as the master model. 10 scans were performed with an intraoral scanner (Trios3) using different scanning methods: a conventional scanning pattern (CSP) without SSA (Group I), CSP with SSA (Group II), SSP with SSA (Group III) and conventional splinted open-tray impression (Group IV). The reference scan was obtained by digitizing the master model using a dental laboratory scanner. The related files were imported into inspection software for trueness and precision assessment. One-way ANOVA, Kruskal-Wallis, SNK-q and Bonferroni test were used to evaluate the values. The level of significance was set at α=0.05.
Results:
For the overall accuracy assessment (trueness and precision), group I exhibited the largest linear and angular deviation (p<0.001) followed by group II (p<0.001). For local accuracy assessment, all intraoral scan bodies (ISB A, B, C, and D) exhibited smaller linear and angular deviations in group III (p<0.05) and group IV (p<0.05) than that in group I. No differences were found between group III and IV (p>0.05), either in the overall accuracy or local accuracy assessment.
Conclusions:
SSA combined with SSP could significantly improve the accuracy of complete-arch digital implant impressions.
