在 FDM 3D 打印的 PVA 模型上进行椅旁临时冠的制作。

Chairside fabrication of provisional crowns on FDM 3D-printed PVA model.

机构信息

Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bukyo-ku, Tokyo 113-8549, Japan.

Oral Prosthetic Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.

出版信息

J Prosthodont Res. 2020 Oct;64(4):401-407. doi: 10.1016/j.jpor.2019.11.004. Epub 2020 Feb 13.

DOI:10.1016/j.jpor.2019.11.004

PMID:32063536

Abstract

PURPOSE

The purpose of this study was to evaluate the dimensional accuracy of crowns fabricated using a polyvinyl alcohol (PVA) dental model.

METHODS

An intraoral scanner (LAVA TDS) was used to scan a prepared molar abutment as a master model. The STL file obtained from the scanning process was transferred into the FDM 3D printer (Value 3D Magix MF-1000) and then models were fabricated with PVA filament. In order to compare with the conventional method, an impression of the master model was taken using silicone impression material to fabricate the conventional stone cast model (Conv). An indirect resin composite (Gradia) and self-cured acrylic resin (Curergrace) were used to fabricate crowns (n = 20) according to the manufacturer's instructions. Surface accuracy of the Conv and PVA models and internal accuracy of the crowns set on the models were measured using two methods; 3D digital analysis and silicon-fitting evaluation. Statistical analysis of the results was done using t-test and Willcoxon signed rank test with Bonferroni correction at 5% significance.

RESULTS

Digital analysis showed the Root Mean Square (RMS) value of PVA model surface was higher than that of Conv, while there was no significant difference between the two crown materials. However, the silicon-fitting analysis showed marginal discrepancy of crowns fabricated on PVA model were within 100 µm.

CONCLUSION

3D printed PVA model can be used for chairside crown fabrication with an acceptable accuracy.

摘要

目的

本研究旨在评估使用聚乙烯醇（PVA）牙科模型制作的牙冠的尺寸精度。

方法

使用口内扫描仪（LAVA TDS）扫描预备好的磨牙基牙作为主模型。从扫描过程中获得的 STL 文件被传输到 FDM 3D 打印机（Value 3D Magix MF-1000），然后用 PVA 灯丝制造模型。为了与传统方法进行比较，使用硅橡胶印模材料对主模型进行印模以制作传统的石铸模型（Conv）。根据制造商的说明，使用间接树脂复合材料（Gradia）和自固化丙烯酸树脂（Curergrace）来制作牙冠（n=20）。使用两种方法（三维数字分析和硅拟合评估）测量 Conv 和 PVA 模型的表面精度以及模型上设置的牙冠的内部精度。使用 t 检验和 Wilcoxon 符号秩检验对结果进行统计分析，并使用 Bonferroni 校正进行 5%显著性检验。