Han Jung-Suk, Yoon Hyung-In
Department of Prosthodontics, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Republic of Korea.
J Dent Sci. 2023 Jul;18(3):1212-1218. doi: 10.1016/j.jds.2023.03.017. Epub 2023 Apr 6.
BACKGROUND/PURPOSE: Subsurface scattering from translucent material would affect the digital scans. This study aimed to evaluate the effect of translucency of ceramic restorative materials and scanning aid conditions on the accuracy of intraoral scans.
Identical anatomic contour crowns with ten ceramic restorative materials were fabricated: five zirconia, three lithium disilicate glass-ceramic, and two leucite reinforced glass-ceramic. The models with ceramic crowns were digitized with an intraoral scanner (IOS) and analyzed for accuracy (n = 10) with and without a scanning aid. Scan time efficiency was recorded. Square-shaped specimens with 1.0-mm thickness were fabricated with the same materials, and translucency parameter (TP) values were measured. One-way ANOVA, Welch ANOVA, and a post-hoc pairwise comparison or independent -test were used for trueness and time analysis, and the F-test was used to examine the precision (α = 0.05). Pearson correlation test was conducted.
Significant differences were revealed for trueness with no scanning aid condition and for TP values ( < 0.05). In contrast, no statistically significant differences were observed for trueness with a scanning aid. A strong correlation (r = 0.854, < 0.01) between TP value and trueness with no scanning aid was revealed. By applying a scanning aid, trueness was improved and scan time efficiency significantly increased ( < 0.05).
The translucency of ceramic restorative materials negatively affects the accuracy of IOS scan without a scanning aid; however, the scan accuracy and time efficiency of IOS scanning for ceramic restorations can be improved by applying scanning aid, and prostheses with high quality without unnecessary labor can be produced.
背景/目的：半透明材料的表面下散射会影响数字扫描。本研究旨在评估陶瓷修复材料的透明度和扫描辅助条件对口腔内扫描准确性的影响。
制作了带有十种陶瓷修复材料的相同解剖轮廓冠：五种氧化锆、三种二硅酸锂玻璃陶瓷和两种白榴石增强玻璃陶瓷。使用口腔内扫描仪（IOS）对带有陶瓷冠的模型进行数字化处理，并在有和没有扫描辅助的情况下分析其准确性（n = 10）。记录扫描时间效率。用相同材料制作厚度为1.0毫米的方形样本，并测量透明度参数（TP）值。采用单因素方差分析、韦尔奇方差分析以及事后成对比较或独立检验进行准确性和时间分析，采用F检验来检验精度（α = 0.05）。进行了Pearson相关性检验。
在没有扫描辅助条件下的准确性和TP值方面显示出显著差异（P < 0.05）。相比之下，在有扫描辅助的情况下，准确性方面未观察到统计学上的显著差异。揭示了TP值与没有扫描辅助时的准确性之间存在强相关性（r = 0.854，P < 0.01）。通过应用扫描辅助，准确性得到提高，扫描时间效率显著增加（P < 0.05）。
陶瓷修复材料的透明度在没有扫描辅助的情况下会对IOS扫描的准确性产生负面影响；然而，通过应用扫描辅助可以提高IOS对陶瓷修复体扫描的准确性和时间效率，并且可以生产出高质量且无需额外人工的修复体。
