Digital scanners characteristics.

This study aimed to compare the accuracy of full-arch digital implant impressions using seven different scanbodies and four intraoral scanners. A 3D-printed maxillary model with six implants and their respective multi-unit abutments was used for this study. Seven scanbodies (SB1, SB2, SB3, SB4, SB5, SB6, and SB7) and four intraoral scanners (Primescan®, Omnican®, Trios 3®, and Trios 4®) were assessed. Each combination group was scanned ten times and a dental lab scanner (D2000, 3Shape) was used as a reference. All scans were exported as STL files, imported into Convince software (3Shape) for alignment, and later into Blender software, where their 3D positions were analyzed using a Python script. The 3D deviation, angular deviation, and linear distance between implants #3 and #14 were also measured. Accuracy was measured in terms of “trueness” (scanbody 3D deviation between intraoral scan and desktop scan). Kruskal-Wallis followed by the Bonferroni correction was used to analyze the data (⍺ = .05). The study found statistically significant differences in digital impression accuracy among the scanners and scanbodies (p本研究旨在对比7种不同扫描杆（scanbody）与4台口内扫描仪（intraoral scanner）在全牙弓数字化种植印模中的精度。本研究采用1台搭载6枚种植体及对应多单元基台的3D打印上颌模型。共评估7种扫描杆（SB1、SB2、SB3、SB4、SB5、SB6及SB7）与4台口内扫描仪（Primescan®、Omnican®、Trios 3®及Trios 4®）。每组组合均扫描10次，并以牙科实验室扫描仪D2000（3Shape公司）作为参考标准。所有扫描结果均导出为STL文件，先导入3Shape公司的Convince软件进行配准对齐，随后导入Blender软件，通过Python脚本分析其三维位置。同时测量种植体#3与#14之间的三维偏差、角度偏差及线性距离。精度以"真实度"（口内扫描与桌面扫描间扫描杆的三维偏差）为衡量指标。数据分析采用克鲁斯卡尔-沃利斯检验结合邦费罗尼校正，检验水准α=0.05。研究发现，不同扫描仪与扫描杆的数字化印模精度存在统计学显著差异（p