Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Istinye University, İstanbul, Turkey; Visiting Researcher, Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
Senior Lecturer, Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
J Prosthet Dent. 2024 Jun;131(6):1198-1207. doi: 10.1016/j.prosdent.2023.01.029. Epub 2023 Mar 2.
The type of intraoral scanner (IOS), region of the implant, and extent of the scanned area have been reported to affect scan accuracy. However, knowledge of the accuracy of IOSs is scarce when digitizing different partially edentulous situations either with complete or partial arch scans.
The purpose of this in vitro study was to investigate the scan accuracy and time efficiency of complete and partial arch scans of different partially edentulous situations with 2 implants and 2 different IOSs.
Three maxillary models with implant spaces at the lateral incisor sites (anterior 4-unit), right first premolar and right first molar sites (posterior 3-unit), or right canine and right first molar sites (posterior 4-unit) were fabricated. After placing implants (Straumann S RN) and scan bodies (CARES Mono Scanbody), models were digitized by using an optical scanner (ATOS Capsule 200MV120) to generate reference standard tessellation language (STL) files. Complete or partial arch scans (test scans) of each model were then performed by using 2 IOSs (Primescan [PS] and TRIOS 3 [T3]) (n=14). The duration of the scans and the time needed to postprocess the STL file until the design could be started were also recorded. A metrology-grade analysis software program (GOM Inspect 2018) was used to superimpose test scan STLs over the reference STL to calculate 3D distance, interimplant distance, and angular (mesiodistal and buccopalatal) deviations. Nonparametric 2-way analysis of variance followed by Mann-Whitney tests with Holm correction were used for trueness, precision, and time efficiency analyses (α=.05).
The interaction between IOSs and scanned area only affected the precision of the scans when angular deviation data were considered (P≤.002). Trueness of the scans was affected by IOSs when 3D distance, interimplant distance, and mesiodistal angular deviations were considered. The scanned area affected only 3D distance deviations (P≤.006). IOSs and scanned area significantly affected the precision of scans when 3D distance, interimplant distance, and mesiodistal angular deviations were considered, while only IOSs significantly affected buccopalatal angular deviations (P≤.040). Scans from PS had higher accuracy when 3D distance deviations were considered for the anterior 4-unit and posterior 3-unit models (P≤.030), when interimplant distance deviations were considered for complete arch scans of the posterior 3-unit model (P≤.048), and when mesiodistal angular deviations were considered in the posterior 3-unit model (P≤.050). Partial arch scans had higher accuracy when 3D distance deviations of the posterior 3-unit model were considered (P≤.002). PS had higher time efficiency regardless of the model and scanned area (P≤.010), while partial arch scans had higher time efficiency when scanning the posterior 3-unit and posterior 4-unit models with PS and the posterior 3-unit model with T3 (P≤.050).
Partial arch scans with PS had similar or better accuracy and time efficiency than other tested scanned area-scanner pairs in tested partial edentulism situations.
已经有报道称，口腔内扫描仪（IOS）的类型、种植体的位置以及扫描区域的范围都会影响扫描的准确性。然而，当数字化不同的部分缺牙情况时，无论是完整的还是部分的弓扫描，对于 IOS 准确性的了解都很有限。
本体外研究的目的是调查在两种不同的 IOS 下，在 2 个种植体和 2 种不同的部分缺牙情况下进行完整和部分弓扫描的扫描准确性和时间效率。
制作了三个带有种植体空间的上颌模型，位于侧切牙部位（前 4 单位）、右侧第一前磨牙和右侧第一磨牙部位（后 3 单位）或右侧犬齿和右侧第一磨牙部位（后 4 单位）。在放置种植体（Straumann S RN）和扫描体（CARES Mono Scanbody）后，使用光学扫描仪（ATOS Capsule 200MV120）对模型进行数字化，生成参考标准三角测量语言（STL）文件。然后，使用两种 IOS（Primescan [PS] 和 TRIOS 3 [T3]）对每个模型进行完整或部分弓扫描（测试扫描）（n=14）。还记录了扫描的持续时间和处理 STL 文件所需的时间，直到可以开始设计。使用计量级分析软件程序（GOM Inspect 2018）将测试扫描的 STL 叠加在参考 STL 上，以计算 3D 距离、种植体间距离和角（近远中向和颊舌向）偏差。使用非参数 2 向方差分析，随后进行带有 Holm 校正的曼-惠特尼检验，用于准确性、精度和时间效率分析（α=.05）。
仅当考虑角度偏差数据时，IOS 和扫描区域之间的相互作用才会影响扫描的精度（P≤.002）。当考虑 3D 距离、种植体间距离和近远中向角度偏差时，IOS 会影响扫描的准确性。仅 IOS 会影响 3D 距离偏差（P≤.006）。当考虑 3D 距离、种植体间距离和近远中向角度偏差时，IOS 和扫描区域会显著影响扫描的精度，而仅 IOS 会显著影响颊舌向角度偏差（P≤.040）。当考虑前 4 单位和后 3 单位模型的 3D 距离偏差时（P≤.030），当考虑后 3 单位模型的种植体间距离偏差时（P≤.048），以及当考虑后 3 单位模型的近远中向角度偏差时（P≤.050），PS 扫描的准确性更高。当考虑后 3 单位模型的 3D 距离偏差时（P≤.002），部分弓扫描的准确性更高。无论模型和扫描区域如何，PS 的时间效率都更高（P≤.010），而当使用 PS 扫描后 3 单位和后 4 单位模型以及使用 T3 扫描后 3 单位模型时，部分弓扫描的时间效率更高（P≤.050）。
在测试的部分缺牙情况下，与其他测试的扫描区域-扫描仪对相比，PS 的部分弓扫描具有相似或更好的准确性和时间效率。
