Laureti Andrea, Marques Tiago, Pitta João, Fehmer Vincent, Sailer Irena, Pozzi Alessandro, Azevedo Luís
Department of Chemical Science and Technologies, University of Rome Tor Vergata, Rome, Italy.
Division of Fixed Prosthodontics and Biomaterials, University Clinics for Dental Medicine, University of Geneva, Geneva, Switzerland.
Clin Oral Implants Res. 2025 Jul 18. doi: 10.1111/clr.70001.
To assess the impact of horizontal intraoral scan bodies (H-ISBs) on the trueness of complete-arch digital impressions compared to vertical ISBs (V-ISBs). To evaluate trueness among four intraoral scanners (IOS) and inter-operator variability across different ISB × IOS combinations.
Digital impressions were made from a dental cast with four multi-unit analogs using four H-ISBs: H-NB, H-NS, H-M6, H-SF, and a V-ISB (V-EA) as a comparison. Two operators performed 10 scans per ISB with four IOS devices (i5D, PS, T3, T4), generating 400 impressions. Reference scans were obtained with a desktop scanner, and trueness was analyzed using root-mean-square (RMS) error calculations (α = 0.05).
H-NS and H-SF exhibited the highest trueness across IOSs, whereas H-NB and H-M6 showed lower trueness. V-EA outperformed H-NB and H-M6 but not H-NS and H-SF. Significant IOS-ISB interaction effects (p < 0.01) indicated H-SF as the most accurate, especially with PS. T4 and i5D displayed greater variability, particularly with H-NB. V-ISBs exhibited higher inter-operator variability compared to H-ISBs.
H-ISBs did not perform better than V-ISBs in all scenarios. The interactions among ISB design, IOS type, and operator significantly affect the digital impression trueness. The discrepancies measured among the systems remain well below the currently accepted threshold for clinically relevant misfit, supporting the suitability of the horizontal configuration for complete-arch impressions.
评估水平口内扫描体（H-ISB）与垂直口内扫描体（V-ISB）相比，对全牙弓数字印模准确性的影响。评估四种口内扫描仪（IOS）之间的准确性以及不同ISB×IOS组合之间的操作者间变异性。
使用四个H-ISB（H-NB、H-NS、H-M6、H-SF）和一个V-ISB（V-EA）作为对照，从带有四个多单位模拟物的牙模上获取数字印模。两名操作者使用四台IOS设备（i5D、PS、T3、T4）对每个ISB进行10次扫描，共生成400个印模。使用台式扫描仪获得参考扫描，并使用均方根（RMS）误差计算分析准确性（α = 0.05）。
H-NS和H-SF在所有IOS中表现出最高的准确性，而H-NB和H-M6的准确性较低。V-EA的表现优于H-NB和H-M6，但不如H-NS和H-SF。显著的IOS-ISB交互效应（p < 0.01）表明H-SF最准确，尤其是与PS配合时。T4和i5D表现出更大变异性，特别是与H-NB配合时。与H-ISB相比，V-ISB表现出更高的操作者间变异性。
H-ISB在所有情况下并不比V-ISB表现更好。ISB设计、IOS类型和操作者之间的相互作用显著影响数字印模的准确性。系统间测量的差异仍远低于目前临床上可接受的不匹配阈值，支持水平配置用于全牙弓印模的适用性。
