Accuracy comparison of complete arch scanning techniques using different non-calibrated scanbodies and intraoral scanners: an in vitro study

Description :

This in vitro study evaluates the 3D accuracy (trueness and precision) of four different non-calibrated implant scan body systems for complete-arch digital impressions. While digital workflows are becoming standard, capturing a full edentulous arch remains a major clinical challenge due to the accumulation of "stitching" errors , which can compromise the passive fit of the final prosthesis. The objective is to compare three innovative geometric designs (ioConnect, RevEx, and MedentiWINGS) against a conventional standard Titanium Implant Scan Body (ISB), across four different intraoral scanners (Primescan, TRIOS 5, SIRIOS, and Aoralscan 3). The methodological approach follows a rigorous digital metrology protocol: Reference Model: A stone cast (6 implants) will be scanned using a high-precision desktop scanner (Ceramill Map 600+) to establish a "gold standard" reference mesh. Data Collection: A total of 112 scans will be performed (7 repetitions for each of the 16 scan body/scanner combinations). Accuracy Assessment: Exported STL files will be processed in Exocad and Geomagic Control X. Trueness will be measured by superimposing experimental scans onto the reference mesh, and precision will be determined by superimposing scans within the same group to calculate Root Mean Square (RMS) deviations. The data will be analyzed using a two-way ANOVA to identify which scan body design and scanner combination provides the highest reliability for complex full-arch rehabilitations.

Titulaire :
TOHME Hani

Contact USJ :
hani.tohme@usj.edu.lb

Chercheur(s) :
Dr Hani TOHME

Projet présenté au CR, le : 01/10/2025

Projet achevé auprès du CR : 01/05/2026