Wu Chengzan, Mangal Utkarsh, Bai Na, Kim Hoon, Hwang Geelsu, Cha Jung-Yul, Lee Kee-Joon, Kwon Jae-Sung, Choi Sung-Hwan
Angle Orthod. 2025 Mar 5;95(4):355-61. doi: 10.2319/081624-672.1.
To determine effects of printing layer thickness and build orientation on mechanical properties and color stability of direct 3D-printed clear aligner resin.
Specimens were printed using 3D printed clear aligner resin with two printing layer thicknesses (50 µm, 100 µm) and three build orientations (90°, 60°, and 45°). Mechanical properties (tensile stress, tensile strain, and elastic modulus), color stability in coffee and artificial saliva, and roughness were then evaluated.
Specimens printed with a 50 µm layer thickness and orientation at 90° demonstrated superior color stability in artificial saliva. However, all specimens showed high susceptibility to coffee staining regardless of layer thickness or orientation. Mechanical properties were improved in the order of 90° < 60° < 45° build orientation, showing statistically significant differences (P < .05). Surface roughness was increased in the order of 90° < 60° < 45° build orientation, showing statistically significant differences (P < .05).
Printing layer thickness and orientation exerted significant effects on mechanical properties, color stability, and surface roughness of 3D-printed clear aligner resin.
确定打印层厚度和构建方向对直接3D打印透明矫治器树脂的力学性能和颜色稳定性的影响。
使用3D打印透明矫治器树脂打印试样，设置两种打印层厚度（50μm、100μm）和三种构建方向（90°、60°和45°）。然后评估力学性能（拉伸应力、拉伸应变和弹性模量）、在咖啡和人工唾液中的颜色稳定性以及粗糙度。
打印层厚度为50μm且构建方向为90°的试样在人工唾液中表现出优异的颜色稳定性。然而，无论层厚度或方向如何，所有试样对咖啡染色都表现出高度敏感性。力学性能按照构建方向90°<60°<45°的顺序得到改善，显示出统计学上的显著差异（P<.05）。表面粗糙度按照构建方向90°<60°<45°的顺序增加，显示出统计学上的显著差异（P<.05）。
打印层厚度和方向对3D打印透明矫治器树脂的力学性能、颜色稳定性和表面粗糙度有显著影响。
