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Updated: Jul 10, 2026
Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision
Published on: April 29, 2014
Effect of scan mode and locking function on the trueness of intraoral scanners during a cut-and-rescan protocol in
Sema Ateşalp İleri1, Mehmet Gözen2, Neslihan Güntekin2
1Faculty of Dentistry, Department of Prosthodontics, Necmettin Erbakan University, Beyşehir Street, Bağlarbaşı Avenue, No: 4, Meram, 42090, Konya, Turkey. semaatslp@gmail.com.
Abstract:
The influence of rescanning protocols, the locking function, and scan modes on the trueness of intraoral scanners (IOS) remains unclear. This study aimed to evaluate how standard and high-definition (HD) scan modes, in combination with the locking function, affect trueness within a cut-and-rescan protocol. A maxillary model simulating a three-unit fixed dental prosthesis was scanned using the 3Shape TRIOS 3 IOS under five conditions: full scan (STD), rescan with standard mode (STD-NL), rescan with HD mode (HD-NL), rescan with standard mode and locking (STD-L), and rescan with HD mode and locking (HD-L). Sixty scans were obtained and compared with a reference model. Trueness was evaluated using root mean square (RMS) values. Data were analyzed using ANOVA and Tukey HSD tests. The HD-L group (46.3 ± 1.69) demonstrated significantly improved trueness compared with the STD (51.7 ± 4.20) and STD-NL (51.2 ± 3.93) groups (p < 0.05), most notably in the anterior segment. In conclusion, the combined use of HD mode and the locking function significantly improves rescanning trueness. Therefore, the HD-L protocol is recommended for achieving optimal trueness, especially in anatomically complex regions.
