Imre Marina, Șaramet Veaceslav, Ciocan Lucian Toma, Vasilescu Vlad-Gabriel, Biru Elena Iuliana, Ghitman Jana, Pantea Mihaela, Ripszky Alexandra, Celebidache Adriana Lucia, Iovu Horia
Discipline of Prosthodontics, Faculty of Dentistry, "Carol Davila" University of Medicine and Pharmacy, 37 Dionisie Lupu Street, District 2, 020021 Bucharest, Romania.
Private Practice, 011841 Bucharest, Romania.
Dent J (Basel). 2025 Jul 10;13(7):311. doi: 10.3390/dj13070311.
: Acrylic resin-based materials are a versatile category used extensively in various dental applications. Processed by current modern technologies, such as CAD/CAM technologies or 3D printing, these materials have revolutionized the field of dentistry for the efficient creation of dental devices. However, despite their extensive use, a limited number of comparative studies exist that investigate how different processing methods-such as traditional techniques, 3D printing, and CAD/CAM milling-impact the nano-mechanical behavior and internal porosity of these materials, which are critical for their long-term clinical performance. The purpose of this study is to evaluate the nanomechanical properties (hardness, elasticity, and stiffness) and micro-porosity of acrylic resin-based materials indicated for temporary prosthodontic appliances manufactured by new technologies (milling, 3D printing) compared to traditional methods. The hardness, elasticity, and stiffness measurements were performed by the nano-metric indentation method (nanoindentation), and the quantitative morphological characterization of the porosity of the acrylic resin samples obtained by 3D printing and CAD/CAM milling was performed by micro-computed tomography. According to nanomechanical investigations, CAD/CAM milling restorative specimens exhibited the greatest mechanical performances (E5.233 GPa and H0.315 GPa), followed by 3D printed samples, while the lowest mechanical properties were registered for the specimen fabricated by the traditional method (E3.552 GPa, H0.142 GPa). At the same time, the results of porosity studies (micro-CT) suggested that 3D printed specimens demonstrated a superior degree of porosity (temporary crown-22.93% and splints-8.94%) compared to CAD/CAM milling restorative samples (5.73%). The comparative analysis of these results allows for the optimal selection of the processing method in order to ensure the specific requirements of the various clinical applications.
基于丙烯酸树脂的材料是一类用途广泛的材料，在各种牙科应用中被广泛使用。通过当前的现代技术（如CAD/CAM技术或3D打印）加工，这些材料已经彻底改变了牙科领域，能够高效制造牙科器械。然而，尽管它们被广泛使用，但针对不同加工方法（如传统技术、3D打印和CAD/CAM铣削）如何影响这些材料的纳米力学行为和内部孔隙率的比较研究数量有限，而这些对于它们的长期临床性能至关重要。本研究的目的是评估与传统方法相比，通过新技术（铣削、3D打印）制造的用于临时修复体的丙烯酸树脂基材料的纳米力学性能（硬度、弹性和刚度）和微孔率。通过纳米压痕法（纳米压痕）进行硬度、弹性和刚度测量，并通过微计算机断层扫描对通过3D打印和CAD/CAM铣削获得的丙烯酸树脂样品的孔隙率进行定量形态表征。根据纳米力学研究，CAD/CAM铣削修复标本表现出最大的力学性能（E5.233 GPa和H0.315 GPa），其次是3D打印样品，而传统方法制造的标本力学性能最低（E3.552 GPa，H0.142 GPa）。同时，孔隙率研究（微CT）结果表明，与CAD/CAM铣削修复样品（5.73%）相比（临时冠-22.93%和夹板-8.94%），3D打印标本显示出更高的孔隙率。对这些结果的比较分析有助于为确保各种临床应用的特定要求而优化加工方法的选择。
