Park Yeseul, Kim Jimin, Kang You-Jung, Shim Eun-Young, Kim Jee-Hwan
Department of Prosthodontics, Oral Science Research Center, College of Dentistry, Yonsei University, Seoul 03722, Republic of Korea.
Department of Prosthodontics, College of Dentistry, Yonsei University, Seoul 03722, Republic of Korea.
Materials (Basel). 2024 Sep 22;17(18):4645. doi: 10.3390/ma17184645.
This study aimed to measure the fracture strengths and hardness of final restorative milled and 3D-printed materials and evaluate the appropriate crown thickness for their clinical use for permanent prosthesis. One type of milled material (group M) and two types of 3D-printed materials (groups P1 and P2) were used. Their crown thickness was set to 0.5, 1.0, and 1.5 mm for each group, and the fracture strength was measured. Vickers hardness was measured and analyzed to confirm the hardness of each material. Scanning electron microscopy was taken to observe the surface changes of the 3D-printed materials under loads of 900 and 1500 N. With increased thickness, the fracture strength significantly increased for group M but significantly decreased for group P1. For group P2, the fracture strengths for the thicknesses of 0.5 mm and 1.5 mm significantly differed, but that for 1.0 mm did not differ from those for other thicknesses. The hardness of group M was significantly higher than that of groups P1 and P2. For all thicknesses, the fracture strength was higher than the average occlusal force for all materials; however, an appropriate crown thickness is required depending on the material and component.
本研究旨在测量最终修复体铣削和3D打印材料的断裂强度和硬度，并评估其在永久性修复临床应用中的合适冠厚度。使用了一种铣削材料（M组）和两种3D打印材料（P1组和P2组）。每组的冠厚度设置为0.5、1.0和1.5毫米，并测量断裂强度。测量并分析维氏硬度以确认每种材料的硬度。进行扫描电子显微镜观察3D打印材料在900和1500 N载荷下的表面变化。随着厚度增加，M组的断裂强度显著增加，而P1组的断裂强度显著降低。对于P2组，0.5毫米和1.5毫米厚度的断裂强度有显著差异，但1.0毫米厚度的断裂强度与其他厚度的无差异。M组的硬度显著高于P1组和P2组。对于所有厚度，所有材料的断裂强度均高于平均咬合力；然而，根据材料和部件的不同，需要合适的冠厚度。
