Resident, Department of Odontology, Faculty of Odontology, University Clermont Auvergne, Clermont Ferrand, France.
Professor, Department of Odontology, Faculty of Odontology, University Clermont Auvergne, Clermont Ferrand, France.
J Prosthet Dent. 2024 Apr;131(4):706.e1-706.e8. doi: 10.1016/j.prosdent.2024.01.011. Epub 2024 Feb 2.
Technological advances in digital acquisition tools have increased the scope of intraoral scanners (IOSs), including scanning a removable complete denture (RCD) to replicate it. However, studies assessing the accuracy of IOSs for replicating a maxillary or mandibular RCD are lacking.
The purpose of this in vitro study was to evaluate the accuracy (trueness and precision) of 3 IOSs while replicating a maxillary and mandibular RCD.
One maxillary and 1 mandibular RCD were scanned with a desktop scanner (D2000) to obtain the reference model. Two operators scanned each RCD 5 times with 3 different IOSs (TRIOS 4, Primescan, and IS3800), following a predefined acquisition protocol. The 60 study models obtained were compared with the reference model using the Geomagic software program. For each comparison, the mean and standard deviation of discrepancy were calculated. Distances were measured on both the reference and the study model, and differences were calculated to assess whether sagittal or transverse deformations were present. The tolerance percentage of the volume of the digital model compared with the volume of the reference model was determined (difference tolerance was set at 0.1 mm). A univariate analysis of variance followed by a post hoc analysis using the Student-Newman-Keuls (α=.05) test was performed to determine the truest and the most precise IOS.
The TRIOS 4 and Primescan IOSs had comparable trueness, with mean dimensional variations of 47 ±27 µm and 57 ±8 µm respectively compared with the reference model. The IS3800 had a lower trueness (98 ±35 µm). Primescan was significantly more precise with a mean standard deviation of 64 ±15 µm (P<.05). The TRIOS 4 (141 ±48 µm) and IS3800 (129 ±24 µm) had comparable precision. Primescan showed the least sagittal and transverse deformation.
This study determined that an RCD can be replicated using an IOS, although all IOSs did not have equal accuracy. An in vivo study needs to assess whether this procedure is clinically acceptable.
数字化采集工具的技术进步扩大了口内扫描仪（IOS）的应用范围，包括扫描可摘局部义齿（RCD）以进行复制。然而，目前缺乏评估 IOS 复制上颌或下颌 RCD 准确性的研究。
本体外研究的目的是评估 3 种 IOS 复制上颌和下颌 RCD 的准确性（准确性和精密度）。
使用桌面扫描仪（D2000）扫描 1 个上颌和 1 个下颌 RCD 以获得参考模型。2 名操作员按照预定义的采集方案，使用 3 种不同的 IOS（TRIOS 4、Primescan 和 IS3800）对每个 RCD 扫描 5 次。使用 Geomagic 软件程序将获得的 60 个研究模型与参考模型进行比较。对于每次比较，计算差异的平均值和标准差。在参考模型和研究模型上测量距离，并计算差异以评估是否存在矢状或横向变形。确定与参考模型相比，数字模型的体积的百分比容差（差异容差设置为 0.1mm）。使用单因素方差分析，然后使用 Student-Newman-Keuls（α=.05）检验进行事后分析，以确定最准确和最精确的 IOS。
TRIOS 4 和 Primescan IOS 的准确性相当，与参考模型相比，平均尺寸变化分别为 47±27μm 和 57±8μm。IS3800 的准确性较低（98±35μm）。Primescan 的精密度显著更高，平均值标准偏差为 64±15μm（P<.05）。TRIOS 4（141±48μm）和 IS3800（129±24μm）的精密度相当。Primescan 显示出最小的矢状和横向变形。
本研究确定可以使用 IOS 复制 RCD，尽管并非所有 IOS 的准确性都相同。需要进行体内研究来评估该程序是否具有临床可接受性。
