Article
Dentistry, Oral Surgery & Medicine
Yichen Xu, Alexander B. Xepapadeas, Bernd Koos, Juergen Geis-Gerstorfer, Ping Li, Sebastian Spintzyk
Summary: The study found that extending the post-rinsing time did not improve the cytocompatibility of SLA-printed orthodontic splint material, and may result in a decrease in flexural strength.
Article
Materials Science, Ceramics
Shuang Chen, Chang-Shun Wang, Wen Zheng, Jia-Min Wu, Chun-Ze Yan, Yu-Sheng Shi
Summary: Alumina mold materials prepared by stereolithography exhibit significant sintering shrinkage, with properties related to casting rarely studied. This study investigates the effects of particle size distribution and sintering temperature on these materials, finding that factors such as fine powder fraction impact viscosity, curing behaviors, and sintering shrinkage.Optimal sintering temperature is determined to be 1550 degrees C, with specimens prepared with a 0.1 fraction of fine powder showing the best creep resistance and mechanical properties.
CERAMICS INTERNATIONAL
(2022)
Article
Dentistry, Oral Surgery & Medicine
Ahmed Altarazi, Julfikar Haider, Abdulaziz Alhotan, Nick Silikas, Hugh Devlin
Summary: Three-dimensional (3D) printing is increasingly used in the dental field for its time-saving potential and cost effectiveness. This study investigated the effect of printing orientation (PO) and post-curing time (CT) on the mechanical and physical properties of a 3D-printed denture base resin. The results showed that printing vertically (90 degrees angle to the platform base) resulted in the highest physical and mechanical properties, and a post-curing time of 30 minutes was sufficient to achieve ideal results.
Article
Dentistry, Oral Surgery & Medicine
Leila Perea-Lowery, Mona Gibreel, Sufyan Garoushi, Pekka Vallittu, Lippo Lassila
Summary: This study evaluated and compared the mechanical properties, water sorption, water solubility, and degree of double bond conversion of three commercially available 3D printing resins for flexible occlusal splints. The results showed significant differences among the materials, indicating the importance of considering these differences when choosing occlusal device materials. KeySplint Soft exhibited the best mechanical properties and water sorption performance.
Article
Dentistry, Oral Surgery & Medicine
Vivien Bieger, Florian M. Thieringer, Jens Fischer, Nadja Rohr
Summary: This in vitro study compared the viability and morphology of human gingival fibroblast cells on conventionally processed, milled, and printed occlusal device materials with different surface treatments. The results showed that the unpolished printed specimens had a cytotoxic effect, but after polishing, the cell behavior was similar to that of conventionally processed and milled specimens. This study provides important implications for material selection and clinical application of occlusal devices.
JOURNAL OF PROSTHETIC DENTISTRY
(2023)
Article
Engineering, Manufacturing
Koen Classens, Thomas Hafkamp, Steyn Westbeek, Joris J. C. Remmers, Siep Weiland
Summary: Photopolymerization-based Additive Manufacturing is increasingly used in the high-tech sector, but facing challenges in improving product quality repeatability. Researchers aim to achieve closed-loop control of the curing process and material property build-up through the development of a control-oriented model and theoretical-numerical methods.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Ceramics
Guanglin Nie, Yehua Li, Pengfei Sheng, Fei Zuo, Haolin Wu, Leiren Liu, Xin Deng, Yiwang Bao, Shanghua Wu
Summary: The study creatively integrated the chemical precipitation coating (CP) process with DLP-stereolithography based 3D printing to refine and homogenize the microstructure of 3D printed Al2O3 ceramic. This innovative approach resulted in more uniform and refined microstructures compared to conventional mechanical mixing (MM) methods.
JOURNAL OF ADVANCED CERAMICS
(2021)
Article
Engineering, Manufacturing
Emre Demir, Inal Kaan Duygun, Ayse Bedeloglu
Summary: The mechanical properties of PLA, PETG, and PLA/PETG structures manufactured using the MMAM method were studied in this work. The results showed that the multi-material part containing 13 layers of PLA and 3 layers of PETG exhibited the highest ultimate tensile strength and good flexural strength. MMAM was discovered to be a viable way for producing PLA/PETG materials with great mechanical performance.
3D PRINTING AND ADDITIVE MANUFACTURING
(2022)
Article
Dentistry, Oral Surgery & Medicine
Wenceslao Piedra-Cascon, Mehrad Sadeghpour, Wael Att, Marta Revilla-Leon
Summary: This technique describes the additive manufacture of a dual-material occlusal device using information captured with an intraoral scanner and a vat-polymerization printer. The resulting occlusal device combines a resilient intaglio with a hard resin exterior surface, leading to improved patient acceptance and comfort, better fit, and minimal adjustments required for fit.
JOURNAL OF PROSTHETIC DENTISTRY
(2021)
Article
Materials Science, Multidisciplinary
M. Shahbaz, N. Pardis, J. Moon, R. Ebrahimi, H. S. Kim
Summary: Vortex extrusion uses a novel designed stationary die to impose intense strain to materials, resulting in torsional deformation and reduction in area. By utilizing a streamline approach to design the VE die, processed samples exhibit a higher fraction of high-angle grain boundaries and significantly improved tensile properties compared to conventional extrusion methods.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
V. P. Dhanapriya, R. Thenmozhi
Summary: This study investigates the mechanical properties of High-performance fiber-reinforced concrete developed with Lignin and brass-coated micro steel fiber. The results show that the brass coating on the mild steel fiber significantly impacts the flexural toughness characteristics of the three-point bending beam specimen, with an increase in the percentage of brass-coated micro steel fiber leading to enhanced flexural toughness parameters. The maximum strength and toughness were achieved with 1.5% fiber content.
Article
Materials Science, Ceramics
Mehdi Mohammadi, Bartolomeo Coppola, Laura Montanaro, Paola Palmero
Summary: Dense hydroxyapatite bars were produced using digital light processing. The effects of HA particle size, curing depth-to-layer thickness ratio, and debinding process on printing/debinding flaws and flexural strength were studied. Optimized bars achieved a flexural strength exceeding 100 MPa, the highest obtained through lithography-based techniques for dense HA fabrication.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Daniel Melzer, Jan Dzugan, Martina Koukolikova, Sylwia Rzepa, Jaroslav Vavrik
Summary: The study focused on investigating the mechanical and structural properties of Functionally Graded Composites (FGC) made of stainless steel 316L and Inconel 718 using Blown Powder Directed Energy Deposition system. Tensile tests and fracture toughness tests were conducted to analyze mechanical properties within single layers and over layers transitions, while metallographic and fractographic investigations revealed differences in interfaces between materials layers and the weakest points of the Functionally Graded Composite.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Zhewu Chen, Liansheng Peng, Zhi Xiao
Summary: This study investigates the influence of high-pressure resin transfer molding (HP-RTM) process variables, such as fiber volume fraction and resin injection flow rate, on the void characteristics and flexural properties of continuous carbon fiber-reinforced composite. The results indicate a close correlation between void content and flexural strength, with resin injection flow rate having a greater impact than fiber volume fraction on void contents.
Article
Engineering, Electrical & Electronic
Pin-Chuan Chen, Chih-Yu Hsieh
Summary: By using a new photopolymer, grayscale digital masks and defocusing method were successfully applied to DLP-SLA 3D printing for rapid fabrication of microlens arrays (MLAs) with improved performance compared to commercial MLAs. Experimental results show that: (1) the material properties of photopolymer greatly influence the performance of MLAs; (2) the image resolution was improved to 58.7 lp/mm, surpassing the commercial plastic MLAs with a resolution of 48.8 lp/mm; (3) defocus method significantly reduced the surface roughness of printed MLAs, critical for image resolution; (4) MLAs with a 10 x 10 array, lens pitch of 120 μm, and lens diameter of 60 μm were successfully manufactured using TP01K9 photopolymer.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)