Lee Beom-Il, You Seung-Gyu, You Seung-Min, Kang Seen-Young, Kim Ji-Hwan
Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea.
Medical Device Research Division, National Institute of Food and Drug Safety Evaluation, Osong, Republic of Korea.
J Adv Prosthodont. 2021 Feb;13(1):24-35. doi: 10.4047/jap.2021.13.1.24. Epub 2021 Feb 23.
This study was to evaluate the effect of rinsing time on the accuracy of interim crowns fabricated by digital light processing.
The maxillary right first molar master die was duplicated using a silicone material, while a study die was produced using epoxy resin. Scans of the epoxy resin die were used in combination with CAD software to design a maxillary right first molar interim crown. Based on this design, 24 interim crowns were fabricated with digital light processing. This study examined the trueness and precision of products that were processed with one of the three different postprocessing rinsing times (1 min, 5 min, and 10 min). Trueness was measured by superimposing reference data with scanned data from external, intaglio, and marginal surfaces. Precision was measured by superimposing the scan data within the group. The trueness and precision data were analyzed using Kruskal-Wallis, nonparametric, and post-hoc tests, and were compared using a Mann-Whitney U test with Bonferroni correction (α=.05).
The trueness of the external and intaglio surfaces of crowns varied significantly among the different rinsing times ( =.004, =.003), but there was no statistically significant difference in terms of trueness measurements of the marginal surfaces ( =.605). In terms of precision, statistically significant differences were found among the external, intaglio, and marginal surfaces ( =.001).
Interim crowns rinsed for 10 minutes showed high accuracy.
本研究旨在评估冲洗时间对数字光处理制作的临时冠准确性的影响。
使用硅橡胶材料复制上颌右侧第一磨牙主模型，同时用环氧树脂制作研究模型。将环氧树脂模型的扫描数据与计算机辅助设计（CAD）软件结合使用，设计上颌右侧第一磨牙临时冠。基于该设计，通过数字光处理制作24个临时冠。本研究考察了用三种不同的后处理冲洗时间（1分钟、5分钟和10分钟）之一处理的产品的准确性和精度。准确性通过将参考数据与来自外部、内表面和边缘表面的扫描数据叠加来测量。精度通过在组内叠加扫描数据来测量。使用Kruskal-Wallis非参数检验和事后检验对准确性和精度数据进行分析，并使用带有Bonferroni校正的Mann-Whitney U检验进行比较（α = 0.05）。
不同冲洗时间下，冠的外部和内表面的准确性有显著差异（P = 0.004，P = 0.003），但边缘表面的准确性测量在统计学上无显著差异（P = 0.605）。在精度方面，外部、内表面和边缘表面之间存在统计学上的显著差异（P = 0.001）。
冲洗10分钟的临时冠显示出较高的准确性。
