Department of General Dental Preclinical Practice, Faculty of Dentistry, Semmelweis University, Budapest, Hungary.
Department of General Dental Preclinical Practice, Faculty of Dentistry, Semmelweis University, Budapest, Hungary.
J Dent. 2024 Dec;151:105431. doi: 10.1016/j.jdent.2024.105431. Epub 2024 Oct 26.
The objective was to investigate the dimensional stability of different types of 3D printed dental models, and to measure the dimensional changes over time.
Four dental casts with different constructions were printed. The four types of models were as follows: hollow casts with 2.5 mm wall thickness (2,5mm.H), hollow casts with 2 mm wall thickness (2mm.H), hollow casts with 2 mm wall thickness with stabilization bars (2mm.B) and hollow casts with 2 mm wall thickness with gypsum base (2mm.G). The casts were digitized with a laboratory scanner (3Shape E3 Red E Scanner) to obtain the reference Standard Tessellation Language (STL) files. All models were stored at room temperature and scanned again after 1 day and after 1, 2 and 10 weeks. This data was compared to the reference STL file and was analysed by comparing the deformation using surface fitting software (Geomagic Control X, 3D Systems). The results were statistically evaluated using paired Student's t-tests, with the significance level set at p < 0.05.
There were significant differences in dimensional stability after 10 weeks between the four different dental casts. According to our results, the 2mm.B casts showed the least deformation which was followed by the 2mm.H casts. However, both the 2,5mm.H and the 2mm.G casts showed significant deformation compared to the 2mm.B casts.
Within the limitations of this study - using only one printer and one type of resin - we found that the deformation of all investigated casts remained within the clinically acceptable range. However, there were significant differences between the various construction types printed with the Bego Varseo Printer and Bego Varseo Wax Model Gray material.
It is crucial to determine how long 3D printed models can maintain their accuracy to prevent potential adverse effects, especially given the extended storage periods required for the time-consuming procedures in prosthodontic and orthodontic treatments.
研究不同类型的 3D 打印牙模的尺寸稳定性，并测量随时间的尺寸变化。
打印了四个具有不同结构的牙模。这四种模型如下：壁厚 2.5 毫米的空心模型（2,5mm.H）、壁厚 2 毫米的空心模型（2mm.H）、壁厚 2 毫米带有稳定杆的空心模型（2mm.B）和壁厚 2 毫米带有石膏基底的空心模型（2mm.G）。将牙模用实验室扫描仪（3Shape E3 Red E Scanner）数字化，以获得参考标准网格语言（STL）文件。所有模型均在室温下储存，并在第 1 天、第 1、2 和 10 周后再次扫描。将这些数据与参考 STL 文件进行比较，并通过使用曲面拟合软件（Geomagic Control X，3D Systems）比较变形进行分析。使用配对学生 t 检验对结果进行统计学评估，显著水平设为 p<0.05。
四种不同牙模在 10 周后尺寸稳定性有显著差异。根据我们的结果，2mm.B 模型的变形最小，其次是 2mm.H 模型。然而，与 2mm.B 模型相比，2,5mm.H 和 2mm.G 模型都显示出明显的变形。
在本研究的限制范围内——仅使用一种打印机和一种类型的树脂——我们发现所有研究的牙模的变形都在临床可接受的范围内。然而，使用 Bego Varseo 打印机和 Bego Varseo 蜡模型灰色材料打印的各种结构类型之间存在显著差异。
确定 3D 打印模型可以保持其准确性的时间长短至关重要，以防止潜在的不良影响，特别是考虑到在修复和正畸治疗中耗时的程序需要更长的储存时间。
