Department of Removable Prosthodontics, Faculty of Dental Medicine, Badr University, Cairo, Egypt.
Department of Prosthodontics, Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt.
BMC Oral Health. 2024 Aug 23;24(1):983. doi: 10.1186/s12903-024-04636-5.
While many denture base materials are currently available on the market, little data exists regarding their dimensional stability after exposure to the oral environment. This study aimed to evaluate the effect of thermocycling on the trueness and precision of milled, 3-dimensional (3D)-printed, and conventional digitally fabricated complete denture bases (CDBs).
A completely edentulous maxillary stone model was scanned to generate a standard tessellation language (STL) file; this was imported into metal-milling-machine software (Redon Hybrid CAD-CAM metal milling machine, Redon, Turkey) to produce a metal model for fabricating 30 CDBs. These were divided into three groups (n = 10 in each) according to the construction technique: group 1, CAD-CAM milled CDBs; group 2, 3D-printed CDBs; and group 3, conventional compression molded CDBs. All CDBs were scanned after fabrication and evaluated before and after thermocycling using superimposition. The data were analyzed using a one-way ANOVA, Tukey's post hoc test, and a paired t-test.
The level of trueness between the CAD-CAM milled, 3D-printed, and compression molded CDBs showed significant differences before and after thermocycling (P < 0.05). Group 1 showed the highest degree of trueness before and after thermocycling, group 3 exhibited a higher degree of trueness than group 2 before thermocycling, and group 2 had a higher degree of trueness than group 3 after thermocycling. There was a significant difference in the precision for each CDB type before and after thermocycling (P < 0.05).
The trueness of the CAD-CAM milling system in complete denture (CD) fabrication is superior to that of the 3D printing and conventional compression molding systems before and after thermocycling. Thermocycling had a significant effect on the precision of all CDB types. The compression molding system in CD construction is the most negatively affected via thermocycling with regard to the measures of trueness and precision.
Not applicable, no human participants were involved.
目前市场上有许多义齿基托材料，但关于它们在口腔环境中暴露后的尺寸稳定性的数据却很少。本研究旨在评估热循环对铣削、3D 打印和传统数字化制作的全口义齿基托（CDB）的准确性和精度的影响。
对完全无牙上颌石模型进行扫描，生成标准 tessellation language（STL）文件；该文件被导入金属铣削机软件（Redon Hybrid CAD-CAM 金属铣削机，Redon，土耳其），以制作 30 个 CDB 的金属模型。这些模型根据制作技术分为三组（每组 10 个）：组 1，CAD-CAM 铣削 CDB；组 2，3D 打印 CDB；组 3，传统压缩成型 CDB。所有 CDB 在制作后进行扫描，并在热循环前后使用叠加进行评估。使用单向方差分析、Tukey 事后检验和配对 t 检验对数据进行分析。
CAD-CAM 铣削、3D 打印和压缩成型 CDB 的准确性在热循环前后有显著差异（P<0.05）。组 1 在热循环前后的准确性最高，组 3 在热循环前的准确性高于组 2，组 2 在热循环后的准确性高于组 3。每个 CDB 类型的精度在热循环前后有显著差异（P<0.05）。
CAD-CAM 铣削系统在全口义齿制作中的准确性优于 3D 打印和传统压缩成型系统，无论是在热循环前后。热循环对所有 CDB 类型的精度都有显著影响。在考虑准确性和精度的措施时，压缩成型系统在 CDB 制作中受热循环的影响最大。
不适用，本研究未涉及人类参与者。
