Abstract：
This study aims to assess the efficacy of post-curing guidance supplied by 3D printing resin manufacturers. Current guidance applies generically to all geometries with the caveat that post-curing should be extended for \'large\' or \'complex\' geometries but specific guidance is not provided. Two vat-polymerisation 3D printers (Form3B, Figure 4 Standalone) were used to print test models in 6 biocompatible resins (Pro Black, Med White, Med Amber, Biomed Black, Biomed White, Biomed Amber). The test model is of a complex geometry whilst also housing ISO 527 test specimens in concentric layers. Two separate intervals of curing were applied (100%, 500% stated guidance) creating different curing treatments of the specimens throughout the model. Post processed test models were disassembled and pull testing performed on each of the specimens to assess the mechanical properties. The analysis showed that extending the curing duration had significant effects on the mechanical properties of some materials but not all. The layers of the model had a significant effect except for elongation at break for the Med Amber material. This research demonstrates that generic post-curing guidance regarding UV exposures is not sufficient to achieve homogenous material strength properties for complex geometries. Large variations in mechanical properties throughout the models suggest some material was not fully-cured. This raises a query if such materials as originally marketed as biocompatible are fully cured and therefore safe to use for medical applications involving complex geometries.
摘要：
本研究旨在评估3D打印树脂制造商提供的固化后指导的有效性。当前指南一般适用于所有几何形状，需要注意的是，后固化应扩展为“大”或“复杂”几何形状，但未提供具体指导。两台还原聚合3D打印机(Form3B，图4独立）用于在6种生物相容性树脂（ProBlack，MedWhite,MedAmber,BiomedBlack,BiomedWhite,Biomed琥珀色）。测试模型具有复杂的几何形状,同时还在同心层中容纳ISO527测试样本。施加两个单独的固化间隔(100%,500%陈述指导)在整个模型中创建不同的标本固化处理。拆卸后处理测试模型,并对每个样品进行拉伸测试以评估机械性能。分析表明，延长固化时间对某些材料的力学性能有显著影响，但不是全部。除了MedAmber材料的断裂伸长率外，模型的各层具有显着影响。这项研究表明，关于紫外线照射的通用固化后指导不足以实现复杂几何形状的均匀材料强度特性。在整个模型中机械性能的大差异表明一些材料没有完全固化。这引发了一个疑问,即,如果最初销售为生物相容性的材料完全固化,并因此安全地用于涉及复杂几何形状的医疗应用。
