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Development of iPSC-derived full-thickness human skin via droplet-based 3D bioprinting 利用液滴生物3D打印技术制备ipsc衍生的全层人体皮肤
Q1 Computer Science Pub Date : 2025-10-28 DOI: 10.1016/j.bprint.2025.e00445
Jieun Baek , Yudong Hong , Donghyun Lee , Ashley Hyomin Roh , C-Yoon Kim , Hyung Min Chung , Ji-Heon Lee , KyoungWhee Jeon
This study successfully established a full-thickness artificial skin model (CLE-iFTs) composed solely of human iPSC-derived fibroblasts (FBs) and keratinocytes (KCs) using a 3D bioprinting system. To evaluate the validity and performance of this model, we compared it with a manually fabricated counterpart (M-iPSC-FTs).
Quantitative analysis revealed that the keratinocyte proliferation rate in CLE-iFTs, as indicated by the percentage of Ki-67 positive cells (18.7 ± 1.2 %, p < 0.01), was significantly higher than in M-iPSC-FTs (9.7 ± 2.8 %). The basal epidermal marker KRT14 showed an average integrated density of 79,621.67 ± 3913.36 in CLE-iFTs and 75,442 ± 3913.36 in M-iPSC-FTs (p < 0.05), while the suprabasal marker KRT10 exhibited an integrated density of 247,260.33 ± 15,570.34 and 193,760 ± 24,214.66, respectively (p < 0.01), indicating stronger epidermal differentiation in the bioprinted model.
In addition, the dermis of CLE-iFTs demonstrated faster cell proliferation and higher cellular density compared to the manual model. Functional assessments further revealed that CLE-iFTs exhibited greater resistance to chemically induced cytotoxicity (IC50 value: 3.087 mg/mL vs. 2.761 mg/mL, p < 0.05) and a more favorable response to UVB irradiation, as evidenced by lower MMP-1 expression (p < 0.001) and higher Pro-collagen levels (p < 0.01).
In conclusion, the CLE-iFTs model provides superior reproducibility, enhanced structural integrity, and improved functional performance compared to manually fabricated models. These results highlight the potential of CLE-iFTs as a robust and reliable platform for advanced skin research, disease modeling, and regenerative medicine applications.
本研究利用生物3D打印系统成功建立了完全由人ipsc衍生成纤维细胞(FBs)和角质形成细胞(KCs)组成的全层人造皮肤模型(CLE-iFTs)。为了评估该模型的有效性和性能,我们将其与手工制作的对应模型(M-iPSC-FTs)进行了比较。定量分析显示,CLE-iFTs的角质细胞增殖率(Ki-67阳性细胞比例为18.7±1.2%,p < 0.01)显著高于M-iPSC-FTs(9.7±2.8%)。基底表皮标记KRT14在CLE-iFTs和M-iPSC-FTs中的平均整合密度分别为79,621.67±3913.36 (p < 0.05)和75,442±3913.36 (p < 0.05),而基底上标记KRT10的平均整合密度分别为247,260.33±15,570.34和193,760±24,214.66 (p < 0.01),表明生物打印模型中表皮分化更强。此外,与手工模型相比,CLE-iFTs的真皮细胞增殖更快,细胞密度更高。功能评估进一步显示,CLE-iFTs对化学诱导的细胞毒性具有更强的抵抗力(IC50值:3.087 mg/mL vs. 2.761 mg/mL, p < 0.05),并且对UVB照射有更有利的反应,证明了较低的MMP-1表达(p < 0.001)和较高的前胶原水平(p < 0.01)。总之,与手工制作的模型相比,CLE-iFTs模型具有更好的可重复性,增强的结构完整性和改进的功能性能。这些结果突出了cle - ift作为先进皮肤研究、疾病建模和再生医学应用的强大可靠平台的潜力。
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引用次数: 0
Impact of Polymer Degradation on Cellular Behavior in Tissue Engineering. 组织工程中聚合物降解对细胞行为的影响。
Q1 Computer Science Pub Date : 2025-10-01 Epub Date: 2025-07-30 DOI: 10.1016/j.bprint.2025.e00429
Kentaro Umemori, Dianne Little

Tissue engineering frequently employs biomimetic scaffolds to direct cell responses and facilitate the differentiation of cells into specific lineages. Biodegradable scaffolds mitigate immune responses, stress shielding concerns in load bearing tissues, and the need for secondary or revision surgical procedures for retrieval. However, during the degradation process, scaffold properties such as fiber diameter, fiber porosity, fiber alignment, surface properties and mechanical properties undergo changes that significantly alter the initial properties. This review aims to comprehensively assess the impact of degradation on scaffold properties from the perspective of their effects on cellular behavior by addressing four key aspects of polymer degradation: First, we review the variables that influence scaffold degradation. Second, we examine how degradation impacts scaffold properties. Third, we explore the effects of scaffold degradation products. Finally, we investigate measures to increase tunability of degradation rate. Harnessing and incorporating these degradation mechanisms into scaffold design holds great promise for advancing the development of tissue-engineered scaffolds, ultimately improving their efficacy and clinical utility.

组织工程经常使用仿生支架来指导细胞反应并促进细胞分化成特定的谱系。可生物降解的支架减轻了免疫反应,减轻了承载组织中的应力屏蔽问题,并减少了对二次或翻修外科手术的需要。然而,在降解过程中,支架性能如纤维直径、纤维孔隙度、纤维排列、表面性能和机械性能发生变化,显著改变了其初始性能。本综述旨在通过解决聚合物降解的四个关键方面,从降解对细胞行为的影响的角度全面评估降解对支架性能的影响:首先,我们回顾了影响支架降解的变量。其次,我们研究了降解如何影响支架性能。第三,我们探讨了支架降解产物的影响。最后,我们探讨了提高降解率可调性的措施。利用并将这些降解机制整合到支架设计中,对于推进组织工程支架的发展,最终提高其疗效和临床应用前景广阔。
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引用次数: 0
3D bioprinting of self-strengthening living materials using cellulose nanofiber-producing bacteria in sodium alginate hydrogel 利用海藻酸钠水凝胶中产生纤维素纳米纤维的细菌进行自我强化生物材料的3D生物打印
Q1 Computer Science Pub Date : 2025-09-26 DOI: 10.1016/j.bprint.2025.e00443
Nan Zhang , Imtiaz Qavi , Marco Araneda , Shaida Sultana Rumi , Noureddine Abidi , Sampa Halder , George Z. Tan
Three-dimensional (3D) bioprinting has emerged as a powerful tool for fabricating engineered living materials (ELMs). Despite recent advances in controlling the spatial distribution of bacteria in hydrogel, printing bacteria-laden hydrogels into bulk 3D structures remains a significant challenge. This study presents a partial crosslinking bioprinting strategy for fabricating bacterial cellulose (BC)-based living scaffolds using sodium alginate (SA) hydrogels embedded with Komagataeibacter xylinus. Pre-crosslinked SA was first printed to define the scaffold outline, followed by infilling with uncrosslinked, bacteria-laden SA bioink to enable in situ BC nanofiber production. As BC nanofibers formed within the hydrogel, the scaffolds exhibited self-strengthening and self-hardening property. The effects of SA concentration and culture duration on cellulose yield, rheological properties, printability, and mechanical performance were systematically evaluated. Based on the quantitative relationship between hydrogel formulation, bacterial activity, and scaffold functionality, we optimized the bioinks to enable both high-resolution printing and efficient cellulose formation. This microbial bioprinting technique provides a robust platform for constructing functional BC-based ELMs with potential applications in biomedicine and tissue engineering.
三维(3D)生物打印已经成为制造工程生物材料(elm)的有力工具。尽管最近在控制水凝胶中细菌的空间分布方面取得了进展,但将细菌负载的水凝胶打印成大块3D结构仍然是一个重大挑战。本研究提出了一种局部交联生物打印策略,利用海藻酸钠(SA)水凝胶包埋木状Komagataeibacter xylinus,制备细菌纤维素(BC)基活支架。首先打印预交联SA以确定支架轮廓,然后填充未交联的细菌SA生物链接,以实现原位BC纳米纤维的生产。由于BC纳米纤维在水凝胶中形成,支架具有自增强和自硬化的特性。系统评价了SA浓度和培养时间对纤维素产率、流变性能、印刷适性和机械性能的影响。基于水凝胶配方、细菌活性和支架功能之间的定量关系,我们优化了生物墨水,以实现高分辨率打印和高效纤维素形成。这种微生物生物打印技术为构建基于bc的功能性elm提供了一个强大的平台,在生物医学和组织工程方面具有潜在的应用前景。
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引用次数: 0
In vitro evaluation of 3D-printed PCL/forsterite scaffolds with aligned collagen and demineralized bone matrix for cranial bone regeneration 胶原-脱矿骨基质3d打印PCL/forsterite支架用于颅骨再生的体外评价
Q1 Computer Science Pub Date : 2025-09-24 DOI: 10.1016/j.bprint.2025.e00442
Fatemeh Saberi, Shohreh Mashayekhan
Developing an appropriate scaffold for cranioplasty applications remains challenging due to the high mechanical strength, controlled degradation, and support for cell migration and proliferation. Despite their common use, traditional materials such as titanium implants, bone allografts, hydroxyapatite, and poly methyl methacrylate have limitations that hinder their effectiveness. Achieving both robust mechanical performance and favorable biological properties in a single scaffold remains a significant challenge. In this study, we introduce a novel fabrication approach that combines 3D printing and directional freeze-casting to create a hybrid scaffold with enhanced structural and biological properties. A composite of polycaprolactone (PCL) and forsterite (FO) was 3D-printed to provide mechanical stability. Meanwhile, collagen and demineralized bone matrix (DBM) were freeze-cast into the pores to form radially aligned microchannels. This design enhances the biological properties and promotes cell migration by mimicking the native extracellular matrix architecture. Our results showed that adding 10 % forsterite to PCL increased the Young's modulus to 100 MPa, with 12 % degradation after one month of immersion in phosphate-buffered saline (PBS). The radially oriented collagen-DBM network supported a 2.4-fold increase in cell proliferation. Furthermore, the in vitro cell migration assay demonstrated enhanced cellular infiltration in aligned versus randomly structured scaffolds. Integrating a directional microstructure, chemical cues from ion release and DBM particles, along with a mechanically robust platform, offers a promising strategy for bone regeneration and cranioplasty applications.
由于高机械强度、可控降解和支持细胞迁移和增殖,开发适合颅骨成形术应用的支架仍然具有挑战性。尽管钛植入物、同种异体骨移植物、羟基磷灰石和聚甲基丙烯酸甲酯等传统材料被广泛使用,但它们的局限性阻碍了它们的有效性。在单一支架中实现强大的机械性能和良好的生物特性仍然是一个重大挑战。在这项研究中,我们介绍了一种新的制造方法,将3D打印和定向冷冻铸造相结合,以创建具有增强结构和生物特性的混合支架。聚己内酯(PCL)和forsterite (FO)的复合材料被3d打印以提供机械稳定性。同时,将胶原蛋白和脱矿骨基质(DBM)冻铸入孔内,形成径向排列的微通道。这种设计通过模仿天然的细胞外基质结构来增强生物特性和促进细胞迁移。我们的研究结果表明,在PCL中加入10%的forsterite可以将杨氏模量提高到100mpa,在磷酸盐缓冲盐水(PBS)中浸泡一个月后,杨氏模量降低了12%。径向导向的胶原- dbm网络支持细胞增殖增加2.4倍。此外,体外细胞迁移实验表明,排列支架与随机支架相比,细胞浸润增强。结合定向微观结构、离子释放的化学线索和DBM颗粒,以及机械坚固的平台,为骨再生和颅骨成形术应用提供了一种有前途的策略。
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引用次数: 0
Towards intelligent cultivated/cultured meat factories: The synergy of AI, 3D bioprinting and automation in next-gen food manufacturing 迈向智能养殖/养殖肉类工厂:人工智能、3D生物打印和自动化在下一代食品制造中的协同作用
Q1 Computer Science Pub Date : 2025-09-17 DOI: 10.1016/j.bprint.2025.e00441
Saumya Saraswat, Twinkle Bhargava, Juhi Landge, Kamalnayan Tibrewal
Global population growth, urbanization, and growing incomes have increased the need for protein, stressing the urgent need for sustainable alternatives to conventional livestock farming, which presents serious ethical, scalability, and environmental issues. Cultured meat, made by culturing animal cells under a controlled environment, is a possible alternative that can lower greenhouse gas emissions, land use, and animal suffering. However, large-scale production of cultured meat with the same texture, structure, and viability as conventional meat remains highly challenging. Even though three-dimensional (3D) bioprinting has become a crucial technique for precisely engineering meat-like, organized tissues, existing systems have hurdles with automation, repeatability, and throughput. The potential of recent (2020–2025) advancements in automation, Machine Learning (ML), and Artificial Intelligence (AI), primarily from the fields of regenerative medicine and tissue engineering, is examined in this paper along with its relevancy to large-scale cultured meat bioprinting.AI-driven process optimization, predictive modelling of cell viability and growth, real-time feedback through sensor-based control systems, robotic integration for material handling and post-processing, automated bioreactor integration, and early company adoption of AI and automation are some of the main topics. Research highlights advantages including less trial-and-error, improved accuracy with robotic systems, computer vision-based real-time print adjustments, and closed-loop feedback that requires less human engagement. The groundwork for intelligent, high-throughput "smart bioprinting factories" is laid by these technologies. This analysis maps out a route toward scalable, affordable cultured meat production with significant promise for industrial use and sustainable protein supply by combining advancements in AI, ML, and robotics.
全球人口增长、城市化和收入增长增加了对蛋白质的需求,迫切需要可持续的替代传统畜牧业,这带来了严重的伦理、可扩展性和环境问题。通过在受控环境下培养动物细胞制成的人造肉是一种可能的替代品,可以减少温室气体排放、土地使用和动物痛苦。然而,大规模生产具有与传统肉类相同质地,结构和活力的培养肉仍然具有很高的挑战性。尽管三维(3D)生物打印已经成为一项关键技术,用于精确地制造类肉组织,但现有的系统在自动化、可重复性和吞吐量方面存在障碍。本文研究了主要来自再生医学和组织工程领域的自动化、机器学习(ML)和人工智能(AI)最近(2020-2025)进步的潜力,以及它与大规模培养肉生物打印的相关性。人工智能驱动的过程优化、细胞活力和生长的预测建模、基于传感器的控制系统的实时反馈、材料处理和后处理的机器人集成、自动化生物反应器集成以及公司早期采用人工智能和自动化是一些主要主题。研究强调了其优点,包括减少试错,提高机器人系统的精度,基于计算机视觉的实时打印调整,以及需要更少人工参与的闭环反馈。这些技术为智能化、高通量的“智能生物打印工厂”奠定了基础。该分析通过结合人工智能、机器学习和机器人技术的进步,为可扩展的、负担得起的培养肉生产指明了一条道路,该生产在工业用途和可持续蛋白质供应方面具有重大前景。
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引用次数: 0
Oxidized alginate-gelatin nanocomposite hydrogels incorporating MXene nanosheets for 3D bioprinting 氧化海藻酸盐-明胶纳米复合水凝胶结合MXene纳米片用于3D生物打印
Q1 Computer Science Pub Date : 2025-09-17 DOI: 10.1016/j.bprint.2025.e00440
Lisa Schöbel , Mariya Tulchynska , Elmira Mohajeri , Christian Polley , Hermann Seitz , Jesus Gonzalez-Julian , Aldo R. Boccaccini
Electrically conductive hydrogels (ECHs) and electrical stimulation effectively regulate osteoblast attachment, proliferation, and differentiation, thus triggering bone tissue regeneration. Here, an alginate dialdehyde-gelatin (ADA-GEL) based hydrogel is modified with an electrically conductive and osteogenic 2D nanomaterial, namely MXene, to produce degradable and 3D printable nanocomposite hydrogels exhibiting electrical conductivity. The effect of MXene filler content on resulting hydrogel characteristics such as morphology, mechanical and electrical properties, swelling and degradation behavior was investigated comprehensively. The results indicate tailorable properties depending on MXene concentration, thus opening a library of ADA-GEL-MXene nanocomposite hydrogels. Moreover, the suitability of ADA-GEL-MXene hydrogels for 3D printing of grid-like scaffolds of up to 10 layers was shown. Additional 3D bioprinting studies demonstrated the applicability of the nanocomposite hydrogels as bioinks for 3D bioprinting of MG-63 osteoblast-like cells. Although the electrical conductivity was increased at higher MXene concentrations, compromised cell behavior was observed. This points to the conclusion that the concentration of MXene nanosheets must be carefully chosen depending on the required properties. Taken together, the presented ADA-GEL-MXene composite hydrogels exhibit significant potential for 3D bioprinting in bone tissue engineering and could be employed for the electrical stimulation of bone cells in the future.
导电水凝胶(ECHs)和电刺激有效调节成骨细胞附着、增殖和分化,从而引发骨组织再生。在这里,一种海藻酸二醛明胶(ADA-GEL)为基础的水凝胶被一种导电和成骨的2D纳米材料,即MXene修饰,以产生具有导电性的可降解和3D打印的纳米复合水凝胶。研究了MXene填料含量对水凝胶形貌、力学性能、电学性能、溶胀和降解性能的影响。结果表明,根据MXene浓度的不同,ADA-GEL-MXene纳米复合水凝胶具有不同的性能,从而建立了一个数据库。此外,ADA-GEL-MXene水凝胶适合3D打印多达10层的网格状支架。另外的3D生物打印研究证明了纳米复合水凝胶作为MG-63成骨细胞样细胞3D生物打印的生物墨水的适用性。虽然在较高的MXene浓度下电导率增加,但观察到细胞行为受损。这表明,MXene纳米片的浓度必须根据所需的性质仔细选择。综上所述,ADA-GEL-MXene复合水凝胶在骨组织工程的生物3D打印中显示出巨大的潜力,并可在未来用于骨细胞的电刺激。
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引用次数: 0
Development of starch-based support material alternately extruded with gelatin-based bioinks for 3D bioprinting application 开发用于生物3D打印的淀粉基支撑材料与明胶基生物墨水交替挤压
Q1 Computer Science Pub Date : 2025-09-15 DOI: 10.1016/j.bprint.2025.e00439
Pekik Wiji Prasetyaningrum, Wildan Mubarok, Takashi Kotani, Shinji Sakai
The use of support materials is crucial for the 3D bioprinting of low-viscosity bioinks, which yield soft hydrogel constructs susceptible to deformation under their weight. In this study, we developed a starch-based support material that provides structural support during printing and supplies hydrogen peroxide (H2O2), for printing cell-laden constructs from low-viscosity bioinks (4.4–53.1 mPa s at 1 s−1 shear rate) composed of a gelatin derivative possessing phenolic hydroxyl moieties (gelatin-Ph), horseradish peroxidase (HRP), and cells. Importantly, the support material can be selectively and gently removed using α-amylase, a biocompatible enzyme, without harming the construct or encapsulated cells, which is a significant advancement over conventional methods of removing support systems. 3D constructs were fabricated by alternately extruding bioinks containing 5.0 w/v% gelatin-Ph and 10 U/mL HRP with a support material consisting of 16.7 w/w% starch and 10 mM H2O2. Immortalized human bone marrow-derived mesenchymal stem cells encapsulated within the constructs showed >80 % viability after printing and exhibited an elongated morphology and proliferation, while maintaining their stemness over 14 days of culture. The cells underwent osteogenic differentiation when cultured in a differentiation medium, as evidenced by the calcium deposition, alkaline phosphatase activity, and expression of osteogenic genes, demonstrating the potential of the proposed approach for tissue-engineering applications.
支撑材料的使用对于低粘度生物墨水的3D生物打印至关重要,因为它产生的软水凝胶结构在其重量下容易变形。在这项研究中,我们开发了一种淀粉基支撑材料,在打印过程中提供结构支撑,并提供过氧化氢(H2O2),用于打印低粘度生物墨水(4.4-53.1 mPa s, 1 s−1剪切速率)的细胞负载结构,该生物墨水由具有酚羟基部分的明胶衍生物(明胶- ph)、辣根过氧化物酶(HRP)和细胞组成。重要的是,可以使用α-淀粉酶(一种生物相容性酶)选择性地、温和地去除支撑材料,而不会损害结构或被包裹的细胞,这是传统去除支撑系统方法的重大进步。通过交替挤压含有5.0 w/v%明胶- ph和10 U/mL HRP的生物墨水,以16.7 w/w%淀粉和10 mM H2O2组成的支撑材料制备三维结构体。包裹在构建物内的永生化人骨髓间充质干细胞在打印后显示出80%的活力,并表现出细长的形态和增殖,同时在培养14天内保持其干性。当细胞在分化培养基中培养时,通过钙沉积、碱性磷酸酶活性和成骨基因的表达证明了细胞发生了成骨分化,证明了该方法在组织工程应用中的潜力。
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引用次数: 0
Advances in polymeric nanoparticles and hydrogels in 3D bioprinting: Enhancing bioinks for tissue engineering and regenerative medicine 高分子纳米粒子和水凝胶在3D生物打印中的进展:增强组织工程和再生医学的生物墨水
Q1 Computer Science Pub Date : 2025-09-13 DOI: 10.1016/j.bprint.2025.e00438
B. Pavithra , Prabhakar Singh , V Ramesh Kumar , Siva Durairaj , Saqib Hassan
In tissue engineering and regenerative medicine, 3D bioprinting has become a revolutionary technique that makes it possible to precisely fabricate intricate biological structures. The creation of sophisticated bioinks, especially those that include hydrogels and polymeric nanoparticles, is essential to its success. These substances promote cellular adhesion, proliferation, and differentiation by providing special physicochemical characteristics that closely resemble the natural extracellular matrix. Hydrogels offer a moist, friendly environment that promotes tissue growth, whereas polymeric nanoparticles improve the mechanical strength, printability, and controlled drug administration of bioinks. Recent developments in the creation and use of hydrogels and polymeric nanoparticles in 3D bioprinting are summarized in this review, with an emphasis on their applications in organ regeneration, wound healing, and personalized medicine. It also discusses current problems that need to be resolved in order to transform laboratory breakthroughs into clinical treatments, such as biocompatibility, structural fidelity, and standardization. The future of 3D bioprinting holds the possibility of previously unheard-of advances in functional tissue restoration and patient-specific treatment through the integration of nanotechnology, machine learning, and biomaterial science.
在组织工程和再生医学领域,生物3D打印已经成为一项革命性的技术,它使精确制造复杂的生物结构成为可能。复杂生物墨水的创造,特别是那些包含水凝胶和聚合纳米颗粒的生物墨水,是其成功的关键。这些物质通过提供与天然细胞外基质非常相似的特殊物理化学特性,促进细胞粘附、增殖和分化。水凝胶提供了一个湿润、友好的环境,促进组织生长,而聚合物纳米颗粒提高了生物墨水的机械强度、可打印性和可控的药物管理。本文综述了水凝胶和聚合物纳米颗粒在生物3D打印中的制备和应用的最新进展,重点介绍了它们在器官再生、伤口愈合和个性化医疗中的应用。它还讨论了当前需要解决的问题,以便将实验室的突破转化为临床治疗,如生物相容性,结构保真度和标准化。通过纳米技术、机器学习和生物材料科学的整合,3D生物打印的未来在功能性组织修复和患者特异性治疗方面拥有前所未有的进步的可能性。
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引用次数: 0
A systematic study of high-performance hydroxyapatite processed by vat photopolymerization additive manufacturing 还原光聚合增材制造高性能羟基磷灰石的系统研究
Q1 Computer Science Pub Date : 2025-09-11 DOI: 10.1016/j.bprint.2025.e00434
Haowen Liang , Tengbo Li , Junpeng Huang , Binbin Guo , Sijing Li , Xiaoteng Chen , Shixiang Yu , Cheng Liu , Guoxian Pei , Jiaming Bai
Vat photopolymerization (VPP) enables the fabrication of hydroxyapatite (HAp) with high resolution, complex geometry and interconnected porous structures. However, the inherent property characterization of the VPP-printed HAp as a comparative benchmark for peer studies is still lacking. This study systematically analyzed the performance of VPP-printed HAp with a 55 vol% solid loading, focusing on printability, fabrication quality, mechanical performance limits, reliability, and biological response. The optimized HAp slurry presented high polymerization reactivity and efficient, precise photocuring performance at 17 mJ/cm2. With a high density of 98.98 % and compacted grain boundaries, the bending strength of the HAp reached 127 MPa, surpassing the highest reported value for 3D-printing HAp by 23.3 %. In vitro studies demonstrated that the VPP-printed HAp promoted osteoblast proliferation and osteogenic differentiation. The HAp fabricated via VPP with efficient printability, controllable fabrication accuracy (within 1 %) and quality, good mechanical performance and osteogenic activity showcased its promising potential in implant fabrication for bone tissue repair.
还原光聚合(VPP)使羟基磷灰石(HAp)具有高分辨率,复杂的几何形状和相互连接的多孔结构。然而,作为同行研究的比较基准,vpp打印HAp的固有特性表征仍然缺乏。本研究系统地分析了固体负载量为55vol %的vpp打印HAp的性能,重点是可打印性、制造质量、机械性能限制、可靠性和生物反应。优化后的HAp料浆具有较高的聚合反应活性和高效、精确的光固化性能,光固化强度为17 mJ/cm2。该材料具有98.98%的高密度和致密的晶界,其弯曲强度达到127 MPa,比3d打印HAp的最高报告值高出23.3%。体外研究表明,vpp打印的HAp促进成骨细胞增殖和成骨分化。VPP制备的HAp具有良好的可打印性、可控制的制造精度(1%以内)和质量、良好的力学性能和成骨活性,在骨组织修复种植体制造中具有广阔的应用前景。
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引用次数: 0
HYBERFLOW — enabling non-invasive flow rate feedback control in bioprinting via hydraulic actuation HYBERFLOW -通过液压驱动实现生物打印的非侵入性流速反馈控制
Q1 Computer Science Pub Date : 2025-09-08 DOI: 10.1016/j.bprint.2025.e00435
Leon Budde , Julia Hundertmark , Tim Meyer , Thomas Seel , Daniel O.M. Weber
Bioprinting offers transformative potential for tissue engineering by enabling the precise fabrication of complex tissue constructs. Of the different bioprinting techniques, extrusion-based bioprinting is the most common, often relying on pneumatic actuation to extrude bioinks. Changes in the viscosity of the bioink, e.g., due to inhomogeneities in the ink or temperature changes in the printing environment, affect the extrusion flow rate if the pneumatic pressure is not adapted accordingly. While maintaining a constant flow rate improves the printing results significantly, continuous monitoring of the flow rate in combination with feedback control is required. Current systems rely on a flow rate sensor to directly measure the flow rate of the bioink, which negatively affects the bioink and requires frequent re-calibrations. To overcome these issues, we are using a hydraulic actuation fluid and implementing a flow rate feedback control based on the flow rate of the actuation fluid rather than the bioink itself. We integrated this concept of hydraulic actuation into our novel hydraulic bioextruder with real-time flow rate control called ”HYBERFLOW”. In this paper, we briefly present the design and our experimental validation of the system. Our experiments are aimed to determine whether the flow rate of the actuation fluid corresponds to the flow rate of the extrusion material, investigate the capabilities of the HYBERFLOW to achieve and maintain a desired flow rate with highly heterogeneous bioinks and determine the limits of the HYBERFLOW in terms of bioink viscosity and printing nozzle geometry. We found that the deviation in volume of the extruded bioink compared to the measured volume of the actuation fluid is less than 4%. This clearly shows the feasibility of controlling the flow rate of the bioink by controlling the flow rate of the actuation fluid. As a result, the flow rate sensor only needs to be in contact with actuation fluid, which is less sensitive and does not require the sensor to be re-calibrated due to its more consistent fluid properties. Furthermore, when extruding a bioink consisting of layers with different viscosities, the feedback control was able to maintain the desired flow rate, leading to a more consistent geometry of the printing result. In conclusion, HYBERFLOW enables real-time flow rate-controlled bioextrusions for improved printing outcomes without negatively affecting the bioink.
生物打印通过精确制造复杂的组织结构,为组织工程提供了变革性的潜力。在不同的生物打印技术中,基于挤压的生物打印是最常见的,通常依靠气动驱动来挤压生物墨水。生物油墨粘度的变化,例如,由于油墨的不均匀性或印刷环境的温度变化,如果没有相应地适应气动压力,则会影响挤出流速。虽然保持恒定的流量可以显著提高打印效果,但需要连续监测流量并结合反馈控制。目前的系统依赖于流速传感器来直接测量生物链的流速,这对生物链有负面影响,需要经常重新校准。为了克服这些问题,我们正在使用液压驱动液,并基于驱动液的流量而不是生物链本身实现流量反馈控制。我们将这种液压驱动的概念集成到我们的新型液压生物挤出机中,该挤出机具有实时流量控制功能,称为“HYBERFLOW”。在本文中,我们简要介绍了系统的设计和实验验证。我们的实验旨在确定驱动流体的流速是否与挤出材料的流速相对应,研究HYBERFLOW在高度非均质生物墨水中实现和保持所需流速的能力,并确定HYBERFLOW在生物墨水粘度和打印喷嘴几何形状方面的极限。我们发现,与驱动流体的测量体积相比,挤压生物链的体积偏差小于4%。这清楚地表明,通过控制驱动流体的流速来控制生物链的流速是可行的。因此,流量传感器只需要与驱动流体接触,由于其流体特性更一致,因此灵敏度较低,不需要重新校准传感器。此外,当挤出由不同粘度层组成的生物墨水时,反馈控制能够保持所需的流速,从而使打印结果具有更一致的几何形状。总之,HYBERFLOW能够实现实时流速控制的生物挤出,从而改善打印效果,而不会对生物链接产生负面影响。
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Bioprinting
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