PDF(Pubmed)
Abstract：
BACKGROUND: The introduction of three-dimensional (3D) printing in dentistry has mainly focused on applications such as surgical planning, computer-guided templates, and digital impression conversions. Additive manufacturing (AM), also known as 3D printing, involves layering resin material sequentially to construct objects and is gaining recognition for its role in creating custom-made medical appliances. The field of orthodontics has also embraced this technological wave and with the advent of cost-effective printers and biocompatible resins, 3D printing has become increasingly feasible and popular in orthodontic clinics. The limitations of traditional plaster models may have prompted the emergence of 3D-printed models, but it led to enhancing treatment planning and device fabrication, particularly in orthodontics. Notable desktop printing technologies include fused deposition modelling (FDM), digital light processing (DLP), and stereolithography (SLA), each employing distinct methods and materials for fabricating appliances. Evaluating mechanical properties, like flexure strength, is crucial to determine the material\'s ability to withstand bending forces and thus prove useful in fabricating thermoformable appliances, surgical templates, etc. This study aims to assess the flexure strength of 3D-printed models using FDM, DLP, and SLA technology, providing insights into their suitability as replacements for conventional models and shedding some light on the durability and sustainability of 3D-printed models.
METHODS: Cuboids measuring 20 x 5 x 2 mm were cut from models, creating 10 samples per printer group. These samples underwent flexure strength testing using a three-point bending system in a universal testing machine.
RESULTS: The FDM group exhibited the highest flexure strength at 69.36 ± 6.03 MPa, while the DLP group showed the lowest flexure strength at 67.47 ± 20.58 MPa. The results can be attributed to the differences in resin materials used for fabrication, with FDM using acrylonitrile butadiene styrene (ABS) polymer and SLA/DLP using polymethyl methacrylate (PMMA), and also to the variation in their printing mechanism.
CONCLUSIONS: The findings affirm the suitability of FDM models for orthodontic applications, suggesting enhanced efficiency and reliability in clinical practices.
METHODS: Cuboids measuring 20 x 5 x 2 mm were cut from models, creating 10 samples per printer group. These samples underwent flexure strength testing using a three-point bending system in a universal testing machine.
RESULTS: The FDM group exhibited the highest flexure strength at 69.36 ± 6.03 MPa, while the DLP group showed the lowest flexure strength at 67.47 ± 20.58 MPa. The results can be attributed to the differences in resin materials used for fabrication, with FDM using acrylonitrile butadiene styrene (ABS) polymer and SLA/DLP using polymethyl methacrylate (PMMA), and also to the variation in their printing mechanism.
CONCLUSIONS: The findings affirm the suitability of FDM models for orthodontic applications, suggesting enhanced efficiency and reliability in clinical practices.
摘要：
背景：在牙科中引入三维（3D）打印主要集中在手术计划等应用上，计算机引导模板，和数字印象转换。增材制造（AM），也被称为3D打印，涉及依次分层树脂材料以构造物体，并因其在创建定制医疗器具中的作用而获得认可。正畸领域也拥抱了这一技术浪潮，并且随着具有成本效益的打印机和生物相容性树脂的出现，3D打印在正畸诊所中变得越来越可行和流行。传统石膏模型的局限性可能促使3D打印模型的出现，但它提高了治疗计划和设备制造，特别是在正畸学中。著名的桌面印刷技术包括熔融沉积成型（FDM），数字光处理(DLP),和立体光刻(SLA)，每种都采用不同的方法和材料来制造器具。评估机械性能，比如弯曲强度，是至关重要的，以确定材料的能力，承受弯曲力，从而证明有用的制造热成型器具，手术模板,等。这项研究旨在评估使用FDM的3D打印模型的挠曲强度，DLP,和SLA技术，提供对它们作为传统模型替代品的适用性的见解，并揭示3D打印模型的耐用性和可持续性。
方法：从模型上切下20x5x2mm的长方体，每个打印机组创建10个样本。这些样品在通用测试机中使用三点弯曲系统进行挠曲强度测试。
结果：FDM组在69.36±6.03MPa时表现出最高的挠曲强度，而DLP组的挠曲强度最低，为67.47±20.58MPa。结果可以归因于用于制造的树脂材料的差异，使用丙烯腈丁二烯苯乙烯（ABS）聚合物的FDM和使用聚甲基丙烯酸甲酯（PMMA）的SLA/DLP，以及它们印刷机制的变化。
结论：研究结果肯定了FDM模型在正畸应用中的适用性，建议提高临床实践的效率和可靠性。
方法：从模型上切下20x5x2mm的长方体，每个打印机组创建10个样本。这些样品在通用测试机中使用三点弯曲系统进行挠曲强度测试。
结果：FDM组在69.36±6.03MPa时表现出最高的挠曲强度，而DLP组的挠曲强度最低，为67.47±20.58MPa。结果可以归因于用于制造的树脂材料的差异，使用丙烯腈丁二烯苯乙烯（ABS）聚合物的FDM和使用聚甲基丙烯酸甲酯（PMMA）的SLA/DLP，以及它们印刷机制的变化。
结论：研究结果肯定了FDM模型在正畸应用中的适用性，建议提高临床实践的效率和可靠性。
