Vat Photopolymerization 3D Printing Hydrogels and Bionic Adhesive Devices: A Minireview
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Abstract Vivid biological structures with reversible adhesive properties are widely found in nature. Although current biomimicking adhesion systems have attracted extensive attention, unmet challenges remain in terms of excellent adhesion preservation, precise structural fabrication, and good environmental compatibility. By combining advanced vat photopolymerization 3D printing technology with hydrogel materials with excellent environmental adaptability, bioinspired adhesion devices present satisfactory application prospects. Herein, a systematic overview of bioinspired hydrogel adhesion devices from the perspectives of material design, structural design, and fabrication is presented. First, the main types and application prospects of vat photopolymerization 3D printed hydrogels are introduced. Subsequently, the research progress on hydrogel‐based vat photopolymerized 3D printed bionic adhesion devices is detailed. Future developments, such as balancing unmet challenges and expected opportunities, in 3D printable multiscale bionic adhesive devices are presented.Keywords:
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本論文は,熱溶解積層方式3Dプリンタによる「たんぽぽの綿毛」の作品制作を題材として,3Dモデルに依存しない造形パスのデザインや3Dプリンタを用いた作品制作について報告するものである.熱溶解積層方式を用いた毛の造形の先行研究を調査するとともに,従来の造形手法では困難であった綿毛の形状や接触回避,安定した造形と量産を実現した.これら課題の解決方法について,具体的な制作過程とともにまとめる.制作と展示の結果を踏まえて,3Dプリンタの扱い方やその可能性,3Dプリンタを用いた作品制作について議論する.
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Abstract In this project, we would like to explore the viability of using 3D printed injection molds to cost-effectively produce low-volume production runs. These 3D printed molds are much more cost-effective than traditional methods, however, the 3D printed molds often only withstand 50–100 cycles. Research is needed to determine how to improve the durability of the molds. This can be accomplished by measuring and documenting how injection molds made from various plastics, and various 3D printing technologies, react under the stresses of an injection molding machine. We can develop a case study using 4 different types of plastics that can be used to create the 3D printed mold. The 3 plastics would be Formlabs Ridged 10k Resin, Formlabs Clear v4, and Formlabs Tough 2000 Resin. These materials will be printed using various 3D printing technologies. This paper will focus on a literature review of the positives and negatives of 3D printing additively manufactured injection molding tooling and propose potential solutions for many of the negatives of 3D printed molds. The case study portion will be based on how we are planning to perform the case study, but it has not yet been completed.
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Abstract Three‐dimensional (3D) printing, or additive manufacturing, technology has rapidly penetrated the medical device industry over the past several years, and innovative groups have harnessed it to create devices with unique composition, structure, and customizability. These distinctive capabilities afforded by 3D printing have introduced new regulatory challenges. The customizability of 3D‐printed devices introduces new complexities when drafting a design control model for FDA consideration of market approval. The customizability and unique build processes of 3D‐printed medical devices pose unique challenges in meeting regulatory standards related to the manufacturing quality assurance. Consistent material powder properties and optimal printing parameters such as build orientation and laser power must be addressed and communicated to the FDA to ensure a quality build. Postprinting considerations unique to 3D‐printed devices, such as cleaning, finishing and sterilization are also discussed. In this manuscript we illustrate how such regulatory hurdles can be navigated by discussing our experience with our group's 3D‐printed bioresorbable implantable device.
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Additive manufacturing (AM) has acquired an increasing interest from industrial, academic, and research fields in the last few decades. One of the AM techniques that is overgrowing and gripping more attention is Fused Deposition Modeling (FDM). 3D printed parts with FDM are being considered in replacing traditionally manufactured parts made with traditional materials. Hence, comes the need for understanding the mechanical behavior of printed parts to evaluate its eligibility for any given application. However, knowledge established is lacking information about 3D printing materials mechanical properties. From here comes the aim of this paper, which is to investigate the compression properties of PLA 3D printed samples. Furthermore, to examine the consistency of mechanical behavior over duplicated 3D printed samples. Specimens would be 3D printed by the FDM technique under the same 3D print conditions to minimize and -or if possible- eliminate the impact of unwanted factors on compressive properties of the material.
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Abstract Light‐driven 3D printing can empower the liberty of creation and concretize the original creation in versatile conditions with plenty of choices in resolution or properties. However, photopolymerization‐based 3D printing inks are facing a trade‐off between requiring processing rate and satisfying performance, and a chemical optimization strategy is proposed to achieve the ink demands of rapid direct ink writing utilizing up‐conversion assisted photopolymerization. Since acylphosphonate can generate two reactive radicals and tertiary amine can reinitiate polymerization in oxygen inhibition, the yielded active species in limited irradiation of 3D printing are maximized to accelerate the polymerization by theoretically and experimentally interpreting the roles of up‐conversion particle, photoinitiators, and co‐initiator played in printing. High print speed in depositing and in situ curing (3.56 × 10 4 mm 3 h −1 ) are realized, and the manufacturing time is shortened by multi‐resolution printing which is impressive compared to current 3D printing methods. The strategy is simultaneously compatible with rigid and elastomeric materials, and will surely contribute to other light‐driven 3D printing technologies for extensive applications.
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This study aims to compare the accuracies of full-arch models printed by two different 3D printing technologies.A mandibular horseshoe-shaped master model was designed with RapidForm XOR2 software The master model was printed 10 times with 3D printers using direct light processing (DLP) and PolyJet technology (n=20). The printed models were then scanned with an industrial scanner and saved in STL file. All digital models superimposed with the master model STL file and comparison of the trueness was performed using Geomagic Control 3D analysis software. The precision was calculated by superimposing combinations of the 10 data sets in each group.The trueness of printed models was 46 µm for the DLP printer and 51 µm for PolyJet printer; however, this difference was not statistically significant (p=0.155). The precision of printed models was 43 µm for the DLP printer and 54 µm for PolyJet printer. DLP printed models were more precise than the PolyJet printed models (p<0.001).The 3D printing technologies showed significant differences in the trueness of full-arch measurements. Although DLP printed models had better trueness than PolyJet printed models, all of the 3D printed models were clinically acceptable and might be used for the production of fixed restorations.
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