Choi Jin Young, Kim Hoon, Kim Seong Hun, Kim Su Jung, Cha Jung-Yul, Lee Se Yeon, Lee Jiho, Min Jinhong, Jang Sunho, Khan Tanveer Ahmed, Kim Hyun-Joong, Kim Ki Beom
Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, 02447, Republic of Korea.
College of Agriculture and Life, Sciences, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea.
Sci Rep. 2025 Jul 2;15(1):23530. doi: 10.1038/s41598-025-93026-0.
This study investigates the mechanical and viscoelastic properties of TC-85, a biocompatible material specifically designed for orthodontic applications, with a focus on how temperature variations influence its mechanical and viscoelastic properties and their relevance to clinical outcomes. Using a Digital Light Processing (DLP) 3D printer, the photosensitive resin TC-85 is printed, and extensive thermo-mechanical testing is conducted, which includes evaluations of tensile modulus, stress relaxation, and creep behavior. Dynamic Mechanical Analysis (DMA) is conducted at temperatures varying from 30 to 45 °C to assess the material's adaptive response to thermal fluctuations. TC-85 is distinguished by its unique mechanical properties, which include a temperature-sensitive stiffness, stress relaxation capability, and shape memory feature. The results demonstrate that TC-85 maintains an enhanced level of residual force and a faster recovery of strain through numerous cycles of loading and unloading. At 40 °C, TC-85 displays a substantial reduction in its storage modulus, while maintaining consistent strain recovery and volumetric constancy. The study highlights TC-85's potential in orthodontic treatments, providing adaptable mechanical and viscoelastic properties that enable the exertion of consistent and regulated forces on teeth. Its resistance to force decay, stable volume at raised temperatures, and shape memory properties enhance hygienic maintenance and patient comfort, positioning TC-85 as a pioneering material for the next generation of clear aligners.
本研究调查了专门为正畸应用设计的生物相容性材料TC-85的力学和粘弹性特性，重点关注温度变化如何影响其力学和粘弹性特性以及它们与临床结果的相关性。使用数字光处理（DLP）3D打印机打印光敏树脂TC-85，并进行广泛的热机械测试，包括拉伸模量、应力松弛和蠕变行为的评估。在30至45°C的温度范围内进行动态力学分析（DMA），以评估材料对热波动的适应性响应。TC-85具有独特的力学性能，包括温度敏感的刚度、应力松弛能力和形状记忆特性。结果表明，通过多次加载和卸载循环，TC-85保持了增强的残余力水平和更快的应变恢复。在40°C时，TC-85的储能模量大幅降低，同时保持一致的应变恢复和体积恒定。该研究突出了TC-85在正畸治疗中的潜力，提供了适应性的力学和粘弹性特性，能够对牙齿施加一致且可控的力。其对力衰减的抵抗力、在升高温度下的稳定体积和形状记忆特性增强了卫生维护和患者舒适度，使TC-85成为下一代透明矫治器的开创性材料。
