Comparison of Fracture Strength of Milled and 3D-Printed Crown Materials According to Occlusal Thickness

被引:2
|
作者
Park, Yeseul [1 ]
Kim, Jimin [1 ]
Kang, You-Jung [2 ]
Shim, Eun-Young [1 ]
Kim, Jee-Hwan [2 ]
机构
[1] Yonsei Univ, Coll Dent, Oral Sci Res Ctr, Dept Prosthodont, Seoul 03722, South Korea
[2] Yonsei Univ, Coll Dent, Dept Prosthodont, Seoul 03722, South Korea
关键词
CAD/CAM; 3D-printed resin; milled hybrid ceramic; permanent prosthesis; fracture strength; Vickers hardness; MECHANICAL-PROPERTIES; 3D; RESISTANCE; RESINS; LOAD;
D O I
10.3390/ma17184645
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
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页数:12
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