Gavras Joanna Nicolette, Abdullah Johari Yap, Choi Mijin, Turkyilmaz Ilser
Department of Prosthodontics, New York University College of Dentistry, New York, NY, USA.
Craniofacial Imaging and Additive Manufacturing Laboratory, School of Dental Sciences, Health Campus, Universiti Sains Malaysia, Kubang Kerian, Kota Bharu, Kelantan, Malaysia.
J Dent Sci. 2025 Jul;20(3):1598-1604. doi: 10.1016/j.jds.2023.01.026. Epub 2023 Feb 14.
BACKGROUND/PURPOSE: The ability to save a digital copy of a fabricated denture is poignant for large dental institutions. The purpose of this study was to evaluate the trueness and precision of an intraoral scanner (IOS) in its ability to digitally duplicate a complete denture (CD) and evaluate the possible effects of file resolution reduction on different exported media types.
A desktop scanner was used to scan a complete mandibular denture and utilized as the control file. An IOS was used to scan the same denture and exported into both standard triangular language (STL) and polygon (PLY) file types and stored for additional analysis. The different file types at original resolution were compared to the desktop scan (DS100) to evaluate the accuracy of the IOS. Then the STL (Groups S100, S75, S50, S25) and PLY (Groups P100, P75, P50, P25) files were reduced in their resolutions to evaluate any statistical discrepancies in the volumetric analysis of the scan using the Hausdorff distance (HD) and dice similarity coefficient (DSC).
When compared to the desktop scan (14888.40 mm), the measured volume of the exported STL (Group S100: 15236.45 ± 114.67 mm) and PLY (Group P100: 15231.71 ± 97.12 mm) files from the IOS produced a similarity of 98.34% and 98.39% respectively. The similarity of the IOS files at different resolutions ranged from 99.99% to 99.96%.
We conclude that the IOS used in this study demonstrates very high trueness and precision when digitally duplicating complete dentures.
背景/目的：对于大型牙科机构而言，保存制作好的义齿数字副本的能力至关重要。本研究的目的是评估口腔内扫描仪（IOS）在数字复制全口义齿（CD）方面的准确性和精确性，并评估文件分辨率降低对不同导出媒体类型的可能影响。
使用台式扫描仪扫描一副下颌全口义齿，并将其用作对照文件。使用IOS扫描同一副义齿，并导出为标准三角语言（STL）和多边形（PLY）文件类型，存储以供进一步分析。将原始分辨率下的不同文件类型与台式扫描（DS100）进行比较，以评估IOS的准确性。然后降低STL（S100组、S75组、S50组、S25组）和PLY（P100组、P75组、P50组、P25组）文件的分辨率，以使用豪斯多夫距离（HD）和骰子相似系数（DSC）评估扫描体积分析中的任何统计差异。
与台式扫描（14888.40立方毫米）相比，IOS导出的STL文件（S100组：15236.45±114.67立方毫米）和PLY文件（P100组：15231.71±97.12立方毫米）的测量体积相似度分别为98.34%和98.39%。不同分辨率下IOS文件的相似度在99.99%至99.96%之间。
我们得出结论，本研究中使用的IOS在数字复制全口义齿时显示出非常高的准确性和精确性。
