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<p>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 (<i>p</i> &lt; 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.</p>

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Effect of scan mode and locking function on the trueness of intraoral scanners during a cut-and-rescan protocol in fixed prosthodontics

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月9日

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  • Sema Ateşalp İleri,
  • Mehmet Gözen,
  • Neslihan Güntekin

摘要

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.