College of Stomatology, Chongqing Medical University, Chongqing, 400015, China.
Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, 401147, China.
Sci Rep. 2024 Nov 22;14(1):28928. doi: 10.1038/s41598-024-80380-8.
The study of denture base resin fabricated by digital technology with surface properties or color stability remains limited. In this study, thermal cycling and staining media (distilled water, artificial saliva, green tea, and Coca-Cola) immersion were used to simulate the intraoral environment to assess the surface properties and color stability of CAD/CAM (milled) and 3D-printed base resin materials, the conventionally polymerized base served as the control group. After thermal cycling, all groups showed increased surface roughness, contact angle (i.e. hydrophilicity) and color difference (∆E), the 3D-printed group had the most significant increase among the 3 groups (P<0.001). While there were no significant difference (or the difference is very small) between the conventional and milled groups. After 7 and 30 days of immersion in four staining media, the ∆E values remained highest in the 3D-printed group (∆E ≥ 3.34) (P<0.001), exceeding the clinically acceptable threshold (∆E = 2.7) at 30 days. Additionally, all groups showed significantly higher ∆E values after 30 days compared to 7 days (P<0.05). The 3D-printed group exhibited a rougher surface, poorer hydrophilicity, and reduced color stability compared to the conventional or milled groups, indicating that further improvements are needed before clinical application.
本研究旨在评估数字化技术制作义齿基托树脂的表面性能和颜色稳定性。使用热循环和染色介质（蒸馏水、人工唾液、绿茶和可口可乐）浸泡来模拟口腔内环境，对 CAD/CAM（铣削）和 3D 打印基托树脂材料以及传统聚合基托进行评估。热循环后，所有组的表面粗糙度、接触角（即亲水性）和色差（∆E）均增加，其中 3D 打印组的增加最为显著（P<0.001）。而传统组和铣削组之间没有显著差异（或差异很小）。在四种染色介质中浸泡 7 天和 30 天后，3D 打印组的 ∆E 值仍然最高（∆E≥3.34）（P<0.001），在 30 天时超过了临床可接受的阈值（∆E=2.7）。此外，与 7 天相比，所有组在 30 天时的 ∆E 值均显著升高（P<0.05）。与传统组或铣削组相比，3D 打印组的表面更粗糙、亲水性更差、颜色稳定性更差，表明在临床应用前需要进一步改进。
