551
|
Abstract
BACKGROUND Repair of peri-prosthetic proximal tibia fractures is very challenging in patients with a total knee replacement or arthroplasty. The tibial component of the knee implant severely restricts the fixation points of the tibial implant to repair peri-prosthetic fractures. A novel implant has been designed with an extended flange over the anterior of tibial condyle to provide additional points of fixation, overcoming limitations of existing generic locking plates used for proximal tibia fractures. Furthermore, the screws fixed through the extended flange provide additional support to prevent the problem of subsidence of tibial component of knee implant. METHODS The design methodology involved extraction of bone data from CT scans into a flexible CAD format, implant design and structural evaluation and optimisation using FEM as well as prototype development and manufacture by selective laser melting 3D printing technology with Ti6Al4 V powder. RESULTS A prototype tibia implant was developed based on a patient-specific bone structure, which was regenerated from the CT images of patient's tibia. The design is described in detail and being applied to fit up to 80% of patients, for both left and right sides based on the average dimensions and shape of the bone structure from a wide range of CT images. CONCLUSION A novel tibial implant has been developed to repair peri-prosthetic proximal tibia fractures which overcomes significant constraints from the tibial component of existing knee implant.
Collapse
|
552
|
Hwang HH, Zhu W, Victorine G, Lawrence N, Chen S. 3D-Printing of Functional Biomedical Microdevices via Light- and Extrusion-Based Approaches. SMALL METHODS 2018; 2:1700277. [PMID: 30090851 PMCID: PMC6078427 DOI: 10.1002/smtd.201700277] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
3D-printing is a powerful additive manufacturing tool, one that enables fabrication of biomedical devices and systems that would otherwise be challenging to create with more traditional methods such as machining or molding. Many different classes of 3D-printing technologies exist, most notably extrusion-based and light-based 3D-printers, which are popular in consumer markets, with advantages and limitations for each modality. The focus here is primarily on showcasing the ability of these 3D-printing platforms to create different types of functional biomedical microdevices-their advantages and limitations are covered with respect to other classes of 3D-printing, as well as the past, recent, and future efforts to advance the functional microdevice domain. In particular, the fabrication of micromachines/robotics, drug-delivery devices, biosensors, and microfluidics is addressed. The current challenges associated with 3D-printing of functional microdevices are also addressed, as well as future directions to improve both the printing techniques and the performance of the printed products.
Collapse
Affiliation(s)
- Henry H Hwang
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Wei Zhu
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Grace Victorine
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Natalie Lawrence
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Shaochen Chen
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
| |
Collapse
|
553
|
McHugh KJ, Nguyen TD, Linehan AR, Yang D, Behrens AM, Rose S, Tochka ZL, Tzeng SY, Norman JJ, Anselmo AC, Xu X, Tomasic S, Taylor MA, Lu J, Guarecuco R, Langer R, Jaklenec A. Fabrication of fillable microparticles and other complex 3D microstructures. Science 2018; 357:1138-1142. [PMID: 28912242 PMCID: PMC6510330 DOI: 10.1126/science.aaf7447] [Citation(s) in RCA: 121] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2016] [Revised: 05/04/2017] [Accepted: 08/14/2017] [Indexed: 12/18/2022]
Abstract
Three-dimensional (3D) microstructures created by microfabrication and additive manufacturing have demonstrated value across a number of fields, ranging from biomedicine to microelectronics. However, the techniques used to create these devices each have their own characteristic set of advantages and limitations with regards to resolution, material compatibility, and geometrical constraints that determine the types ofmicrostructures that can be formed.We describe a microfabrication method, termed StampEd Assembly of polymer Layers (SEAL), and create injectable pulsatile drug-delivery microparticles, pH sensors, and 3D microfluidic devices that we could not produce using traditional 3D printing. SEAL allows us to generate microstructures with complex geometry at high resolution, produce fully enclosed internal cavities containing a solid or liquid, and use potentially any thermoplastic material without processing additives.
Collapse
Affiliation(s)
- Kevin J McHugh
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Thanh D Nguyen
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Allison R Linehan
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - David Yang
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Adam M Behrens
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Sviatlana Rose
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Zachary L Tochka
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Stephany Y Tzeng
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - James J Norman
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Aaron C Anselmo
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Xian Xu
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Stephanie Tomasic
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Matthew A Taylor
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Jennifer Lu
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Rohiverth Guarecuco
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Robert Langer
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
| | - Ana Jaklenec
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
| |
Collapse
|
554
|
Liu C, Ho C, Wang J. The development of 3D food printer for printing fibrous meat materials. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1757-899x/284/1/012019] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
555
|
Stratton S, Manoukian OS, Patel R, Wentworth A, Rudraiah S, Kumbar SG. Polymeric 3D Printed Structures for Soft-Tissue Engineering. J Appl Polym Sci 2018; 135:455569. [PMID: 29887640 PMCID: PMC5991624 DOI: 10.1002/app.45569] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
3D printing, or rapid prototyping, is a fabrication technique that is used for various engineering applications with advantages such as mass production and fine tuning of spatial-dimensional properties. Recently, this fabrication method has been adopted for tissue engineering applications due to its ability to finely tune porosity and create precise, uniform, and repeatable structures. This review aims to introduce 3D printing applications in soft tissue engineering and regenerative medicine including state-of-the-art scaffolds and key future challenges. Furthermore, 3D printing of individual cells, an evolution of traditional 3D printing technology which represents a cutting-edge technique for the creation of cell seeded scaffolds in vitro, is discussed. Key advances demonstrate the advantages of 3D printing, while also highlighting potential shortcomings to improve upon. It is clear that as 3D printing technology continues to develop, it will serve as a truly revolutionary means for fabrication of structures and materials for regenerative applications.
Collapse
Affiliation(s)
- Scott Stratton
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
| | - Ohan S. Manoukian
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
| | - Ravi Patel
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
- Department of Computer Science Engineering, University of Connecticut, Storrs CT, USA
| | - Adam Wentworth
- Department of Computer Science Engineering, University of Connecticut, Storrs CT, USA
| | - Swetha Rudraiah
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
- Department of Pharmaceutical Sciences, University of Saint Joseph, Hartford, CT, USA
| | - Sangamesh G. Kumbar
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
| |
Collapse
|
556
|
Chen CH, Yao YY, Tang HC, Lin TY, Chen D, Cheng KW. Long-term antibacterial performances of biodegradable polylactic acid materials with direct absorption of antibiotic agents. RSC Adv 2018; 8:16223-16231. [PMID: 35542195 PMCID: PMC9080263 DOI: 10.1039/c8ra00504d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 04/21/2018] [Indexed: 11/30/2022] Open
Abstract
In this study, polylactic acid (PLA) disks with antibacterial performances were prepared using 3D printing technology combined with direct adsorption of the antibiotic agents in solution baths. The effects of the layer thicknesses for the building of the 3D printing PLA disks and the amounts of antibiotic agents absorbed onto the sample surfaces on their antibacterial activities were investigated. The antibiotic agent release profiles from the samples surface into the buffer solution show that the antibacterial performances of these samples can reach up to 28 days. With a decrease in the concentration of antibiotic agent in the solution bath, the amount of antibiotic agent adsorbed on the sample surfaces also decreases, but their antibacterial performances can still maintain at least 7 days. In the bioactivity tests of the various organisms, the release amount of antibiotic agent from the sample can inhibit E. coli and S. aureus for over 80% up to 28 days. In the antibacterial activity tests, a PLA disk with suitable antibiotic agents covering its surface has a good inhibitory effect on the growth ability of S. aureus of less than 50% in six hours. In this study, we developed a surface modification of 3D printing PLA disks. The relative optical density of the S. aureus in the solution can reduce to 40% using the PLA disk directly absorbed with suitable antibiotic agents.![]()
Collapse
Affiliation(s)
- Chien-Hao Chen
- Department of Orthopaedic Surgery
- Chang Gung Memorial Hospital
- Taiwan
- College of Medicine
- Chang Gung University
| | - Yuan-Yuan Yao
- Department of Chemical and Materials Engineering
- Chang Gung University
- Taoyuan
- Taiwan
| | - Hao-Che Tang
- Department of Orthopaedic Surgery
- Chang Gung Memorial Hospital
- Taiwan
- College of Medicine
- Chang Gung University
| | - Tung-Yi Lin
- Department of Orthopaedic Surgery
- Chang Gung Memorial Hospital
- Taiwan
- College of Medicine
- Chang Gung University
| | - Dave W. Chen
- Department of Orthopaedic Surgery
- Chang Gung Memorial Hospital
- Taiwan
- College of Medicine
- Chang Gung University
| | - Kong-Wei Cheng
- Department of Orthopaedic Surgery
- Chang Gung Memorial Hospital
- Taiwan
- Department of Chemical and Materials Engineering
- Chang Gung University
| |
Collapse
|
557
|
Abstract
Recent progress in the photoinitiators and monomers/oligomers of photopolymers for 3D printing is presented in the review.
Collapse
Affiliation(s)
- Jing Zhang
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| | - Pu Xiao
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| |
Collapse
|
558
|
The History, Developments and Opportunities of Stereolithography. 3D PRINTING OF PHARMACEUTICALS 2018. [DOI: 10.1007/978-3-319-90755-0_4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
559
|
Zhang J, Zivic N, Dumur F, Xiao P, Graff B, Fouassier JP, Gigmes D, Lalevée J. N-[2-(Dimethylamino)ethyl]-1,8-naphthalimide derivatives as photoinitiators under LEDs. Polym Chem 2018. [DOI: 10.1039/c8py00055g] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Four N-[2-(dimethylamino)ethyl]-1,8-naphthalimide derivatives (ANNs) with different substituents in the naphthalimide skeleton have been synthesized and can be used as versatile photoinitiators under various LEDs.
Collapse
Affiliation(s)
- Jing Zhang
- Institut de Science des Matériaux de Mulhouse IS2 M
- 68057 Mulhouse Cedex
- France
- Research School of Chemistry
- Australian National University
| | | | | | - Pu Xiao
- Institut de Science des Matériaux de Mulhouse IS2 M
- 68057 Mulhouse Cedex
- France
- Research School of Chemistry
- Australian National University
| | - Bernadette Graff
- Institut de Science des Matériaux de Mulhouse IS2 M
- 68057 Mulhouse Cedex
- France
| | | | | | - Jacques Lalevée
- Institut de Science des Matériaux de Mulhouse IS2 M
- 68057 Mulhouse Cedex
- France
| |
Collapse
|
560
|
|
561
|
Drzewiecki KE, Malavade JN, Ahmed I, Lowe CJ, Shreiber DI. A thermoreversible, photocrosslinkable collagen bio-ink for free-form fabrication of scaffolds for regenerative medicine. TECHNOLOGY 2017; 5:185-195. [PMID: 29541655 PMCID: PMC5845803 DOI: 10.1142/s2339547817500091] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
As a biomaterial, collagen has been used throughout tissue engineering and regenerative medicine. Collagen is native to the body, is highly biocompatible, and naturally promotes cell adhesion and regeneration. However, collagen fibers and the inherent weak mechanical properties of collagen hydrogels interfere with further development of collagen as a bio-ink. Herein, we demonstrate the use of a modified type-I collagen, collagen methacrylamide (CMA), as a fibril-forming bio-ink for free-form fabrication of scaffolds. Like collagen, CMA can self-assemble into a fibrillar hydrogel at physiological conditions. In contrast, CMA is photocrosslinkable and thermoreversible, and photocrosslinking eliminates thermoreversibility. Free-form fabrication of CMA was performed through self-assembly of the CMA hydrogel, photocrosslinking the structure of interest using a photomask, and cooling the entire hydrogel, which results in cold-melting of unphotocrosslinked regions. Printed hydrogels had a resolution on the order of ~350 μm, and can be fabricated with or without cells and maintain viability or be further processed into freeze-dried sponges, all while retaining pattern fidelity. A subcutaneous implant study confirmed the biocompatibility of CMA in comparison to collagen. Free-form fabrication of CMA allows for printing of macroscale, customized scaffolds with good pattern fidelity and can be implemented with relative ease for continued research and development of collagen-based scaffolds in tissue engineering.
Collapse
Affiliation(s)
- Kathryn E Drzewiecki
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, 599 Taylor Road, Piscataway, NJ 08854, USA
| | - Juilee N Malavade
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, 599 Taylor Road, Piscataway, NJ 08854, USA
| | - Ijaz Ahmed
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, 599 Taylor Road, Piscataway, NJ 08854, USA
| | - Christopher J Lowe
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, 599 Taylor Road, Piscataway, NJ 08854, USA
| | - David I Shreiber
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, 599 Taylor Road, Piscataway, NJ 08854, USA
| |
Collapse
|
562
|
Tian P, Chen C, Hu J, Qi J, Wang Q, Chen JCM, Cavanaugh J, Peng Y, Cheng MMC. A novel fabrication method of carbon electrodes using 3D printing and chemical modification process. Biomed Microdevices 2017; 20:4. [PMID: 29170867 DOI: 10.1007/s10544-017-0247-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Three-dimensional (3D) printing is an emerging technique in the field of biomedical engineering and electronics. This paper presents a novel biofabrication method of implantable carbon electrodes with several advantages including fast prototyping, patient-specific and miniaturization without expensive cleanroom. The method combines stereolithography in additive manufacturing and chemical modification processes to fabricate electrically conductive carbon electrodes. The stereolithography allows the structures to be 3D printed with very fine resolution and desired shapes. The resin is then chemically modified to carbon using pyrolysis to enhance electrochemical performance. The electrochemical characteristics of 3D printing carbon electrodes are assessed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The specific capacitance of 3D printing carbon electrodes is much higher than the same sized platinum (Pt) electrode. In-vivo electromyography (EMG) recording, 3D printing carbon electrodes exhibit much higher signal-to-noise ratio (40.63 ± 7.73) than Pt electrodes (14.26 ± 6.83). The proposed biofabrication method is envisioned to enable 3D printing in many emerging applications in biomedical engineering and electronics.
Collapse
Affiliation(s)
- Pan Tian
- State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, China
| | - Chaoyang Chen
- Department of Biomedical Engineering, Wayne State University, Detroit, MI, USA
| | - Jie Hu
- State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, China.
| | - Jin Qi
- State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, China
| | - Qianghua Wang
- Department of Biomedical Engineering, Wayne State University, Detroit, MI, USA
| | | | - John Cavanaugh
- Department of Biomedical Engineering, Wayne State University, Detroit, MI, USA
| | - Yinghong Peng
- State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, China
| | - Mark Ming-Cheng Cheng
- Department of Biomedical Engineering, Wayne State University, Detroit, MI, USA. .,Electrical and Computer Engineering, Wayne State University, Detroit, MI, USA.
| |
Collapse
|
563
|
Revilla-León M, Gonzalez-Martín Ó, Pérez López J, Sánchez-Rubio JL, Özcan M. Position Accuracy of Implant Analogs on 3D Printed Polymer versus Conventional Dental Stone Casts Measured Using a Coordinate Measuring Machine. J Prosthodont 2017; 27:560-567. [PMID: 29148121 DOI: 10.1111/jopr.12708] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/20/2017] [Indexed: 11/29/2022] Open
Abstract
PURPOSE To compare the accuracy of implant analog positions on complete edentulous maxillary casts made of either dental stone or additive manufactured polymers using a coordinate measuring machine (CMM). MATERIAL AND METHODS A completely edentulous maxillary model of a patient with 7 implant analogs was obtained. From this model, two types of casts were duplicated, namely conventional dental stone (CDS) using a custom tray impression technique after splinting (N = 5) and polymer cast using additive manufacturing based on the STL file generated. Polymer casts (N = 20; n = 5 per group) were fabricated using 4 different additive manufacturing technologies (multijet printing-MJP1, direct light processing-DLP, stereolithography-SLA, multijet printing-MJP2). CMM was used to measure the correct position of each implant, and distortion was calculated for each system at x-, y-, and z-axes. Measurements were repeated 3 times per specimen in each axis yielding a total of 546 measurements. Data were analyzed using ANOVA, Sheffé tests, and Bonferroni correction (α = 0.05). RESULTS Compared to CMM, the mean distortion (μm) ranged from 22.7 to 74.9, 23.4 to 49.1, and 11.0 to 85.8 in the x-, y-, and z-axes, respectively. CDS method (x-axis: 37.1; z-axis: 27.62) showed a significant difference compared to DLP on the x-axis (22.7) (p = 0.037) and to MJP1 on the z-axis (11.0) (p = 0.003). Regardless of the cast system, x-axes showed more distortion (42.6) compared to y- (34.6) and z-axes (35.97). Among additive manufacturing technologies, MJP2 presented the highest (64.3 ± 83.6), and MJP1 (21.57 ± 16.3) and DLP (27.07 ± 20.23) the lowest distortion, which was not significantly different from CDS (32.3 ± 22.73) (p > 0.05). CONCLUSION For the fabrication of the definitive casts for implant prostheses, one of the multijet printing systems and direct light processing additive manufacturing technologies showed similar results to conventional dental stone. CLINICAL SIGNIFICANCE Conventional dental stone casts could be accurately duplicated using some of the additive manufacturing technologies tested.
Collapse
Affiliation(s)
- Marta Revilla-León
- Revilla Research Center, Madrid, Spain.,Graduate Prosthodontics, University of Washington School of Dentistry, Seattle, WA
| | - Óscar Gonzalez-Martín
- Department of Periodontics, University of Pennsylvania School of Dental Medicine, Philadelphia, PA.,Department of Periodontology, University Complutense of Madrid, Madrid, Spain
| | - Javier Pérez López
- Revilla Research Center, Madrid, Spain.,Tecnica Studio Laboratory, Madrid, Spain
| | | | - Mutlu Özcan
- Division of Dental Materials, Center for Dental and Oral Medicine, University of Zürich, Zürich, Switzerland
| |
Collapse
|
564
|
Thrasher CJ, Schwartz JJ, Boydston AJ. Modular Elastomer Photoresins for Digital Light Processing Additive Manufacturing. ACS APPLIED MATERIALS & INTERFACES 2017; 9:39708-39716. [PMID: 29039648 DOI: 10.1021/acsami.7b13909] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A series of photoresins suitable for the production of elastomeric objects via digital light processing additive manufacturing are reported. Notably, the printing procedure is readily accessible using only entry-level equipment under ambient conditions using visible light projection. The photoresin formulations were found to be modular in nature, and straightforward adjustments to the resin components enabled access to a range of compositions and mechanical properties. Collectively, the series includes silicones, hydrogels, and hybrids thereof. Printed test specimens displayed maximum elongations of up to 472% under tensile load, a tunable swelling behavior in water, and Shore A hardness values from 13.7 to 33.3. A combination of the resins was used to print a functional multimaterial three-armed pneumatic gripper. These photoresins could be transformative to advanced prototyping applications such as simulated human tissues, stimuli-responsive materials, wearable devices, and soft robotics.
Collapse
Affiliation(s)
- Carl J Thrasher
- Department of Chemistry, University of Washington , P.O. Box 351700, Seattle, Washington 98195, United States
| | - Johanna J Schwartz
- Department of Chemistry, University of Washington , P.O. Box 351700, Seattle, Washington 98195, United States
| | - Andrew J Boydston
- Department of Chemistry, University of Washington , P.O. Box 351700, Seattle, Washington 98195, United States
| |
Collapse
|
565
|
Jiao Z, Li F, Xie L, Liu X, Chi B, Yang W. Experimental research of drop-on-demand droplet jetting 3D printing with molten polymer. J Appl Polym Sci 2017. [DOI: 10.1002/app.45933] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zhiwei Jiao
- State Key Laboratory of Organic-Inorganic, College of Mechanical and Electrical Engineering; Beijing University of Chemical Technology; Beijing 100029 People's Republic of China
| | - Fei Li
- State Key Laboratory of Organic-Inorganic, College of Mechanical and Electrical Engineering; Beijing University of Chemical Technology; Beijing 100029 People's Republic of China
| | - Liyang Xie
- Beijing Aerospace Propulsion Institute; Beijing 100048 People's Republic of China
| | - Xiaojun Liu
- State Key Laboratory of Organic-Inorganic, College of Mechanical and Electrical Engineering; Beijing University of Chemical Technology; Beijing 100029 People's Republic of China
| | - Baihong Chi
- Space Star Technology Co., Ltd; Beijing 100086 People's Republic of China
| | - Weimin Yang
- State Key Laboratory of Organic-Inorganic, College of Mechanical and Electrical Engineering; Beijing University of Chemical Technology; Beijing 100029 People's Republic of China
| |
Collapse
|
566
|
Polishability and wear resistance of splint material for oral appliances produced with conventional, subtractive, and additive manufacturing. J Mech Behav Biomed Mater 2017; 75:175-179. [DOI: 10.1016/j.jmbbm.2017.07.019] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 07/10/2017] [Accepted: 07/13/2017] [Indexed: 11/21/2022]
|
567
|
|
568
|
Justin AW, Saeb-Parsy K, Markaki AE, Vallier L, Sampaziotis F. Advances in the generation of bioengineered bile ducts. Biochim Biophys Acta Mol Basis Dis 2017; 1864:1532-1538. [PMID: 29097260 DOI: 10.1016/j.bbadis.2017.10.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 10/25/2017] [Accepted: 10/26/2017] [Indexed: 12/17/2022]
Abstract
The generation of bioengineered biliary tissue could contribute to the management of some of the most impactful cholangiopathies associated with liver transplantation, such as biliary atresia or ischemic cholangiopathy. Recent advances in tissue engineering and in vitro cholangiocyte culture have made the achievement of this goal possible. Here we provide an overview of these developments and review the progress towards the generation and transplantation of bioengineered bile ducts. This article is part of a Special Issue entitled: Cholangiocytes in Health and Diseaseedited by Jesus Banales, Marco Marzioni and Peter Jansen.
Collapse
Affiliation(s)
| | - Kourosh Saeb-Parsy
- Department of Surgery, University of Cambridge and NIHR Cambridge Biomedical Research Centre, Cambridge, UK
| | - Athina E Markaki
- Department of Engineering, University of Cambridge, Cambridge, UK
| | - Ludovic Vallier
- Wellcome Trust-Medical Research Council Stem Cell Institute, Cambridge Stem Cell Institute, Anne McLaren Laboratory, University of Cambridge, Cambridge, UK; Wellcome Trust Sanger Institute, Hinxton, UK; Department of Hepatology, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Fotios Sampaziotis
- Department of Surgery, University of Cambridge and NIHR Cambridge Biomedical Research Centre, Cambridge, UK; Wellcome Trust-Medical Research Council Stem Cell Institute, Cambridge Stem Cell Institute, Anne McLaren Laboratory, University of Cambridge, Cambridge, UK; Department of Hepatology, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK.
| |
Collapse
|
569
|
Tahayeri A, Morgan M, Fugolin AP, Bompolaki D, Athirasala A, Pfeifer CS, Ferracane JL, Bertassoni LE. 3D printed versus conventionally cured provisional crown and bridge dental materials. Dent Mater 2017; 34:192-200. [PMID: 29110921 DOI: 10.1016/j.dental.2017.10.003] [Citation(s) in RCA: 238] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 09/29/2017] [Accepted: 10/02/2017] [Indexed: 11/15/2022]
Abstract
OBJECTIVES To optimize the 3D printing of a dental material for provisional crown and bridge restorations using a low-cost stereolithography 3D printer; and compare its mechanical properties against conventionally cured provisional dental materials. METHODS Samples were 3D printed (25×2×2mm) using a commercial printable resin (NextDent C&B Vertex Dental) in a FormLabs1+ stereolithography 3D printer. The printing accuracy of printed bars was determined by comparing the width, length and thickness of samples for different printer settings (printing orientation and resin color) versus the set dimensions of CAD designs. The degree of conversion of the resin was measured with FTIR, and both the elastic modulus and peak stress of 3D printed bars was determined using a 3-point being test for different printing layer thicknesses. The results were compared to those for two conventionally cured provisional materials (Integrity®, Dentsply; and Jet®, Lang Dental Inc.). RESULTS Samples printed at 90° orientation and in a white resin color setting was chosen as the most optimal combination of printing parameters, due to the comparatively higher printing accuracy (up to 22% error), reproducibility and material usage. There was no direct correlation between printing layer thickness and elastic modulus or peak stress. 3D printed samples had comparable modulus to Jet®, but significantly lower than Integrity®. Peak stress for 3D printed samples was comparable to Integrity®, and significantly higher than Jet®. The degree of conversion of 3D printed samples also appeared higher than that of Integrity® or Jet®. SIGNIFICANCE Our results suggest that a 3D printable provisional restorative material allows for sufficient mechanical properties for intraoral use, despite the limited 3D printing accuracy of the printing system of choice.
Collapse
Affiliation(s)
- Anthony Tahayeri
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
| | - MaryCatherine Morgan
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
| | - Ana P Fugolin
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
| | - Despoina Bompolaki
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
| | - Avathamsa Athirasala
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
| | - Carmem S Pfeifer
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
| | - Jack L Ferracane
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
| | - Luiz E Bertassoni
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA; Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, USA; Center for Regenerative Medicine, Oregon Health & Science University, Portland, OR, USA.
| |
Collapse
|
570
|
VanKoevering KK, Malloy KM. Emerging Role of Three-Dimensional Printing in Simulation in Otolaryngology. Otolaryngol Clin North Am 2017; 50:947-958. [DOI: 10.1016/j.otc.2017.05.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
571
|
Silva LHD, Lima ED, Miranda RBDP, Favero SS, Lohbauer U, Cesar PF. Dental ceramics: a review of new materials and processing methods. Braz Oral Res 2017; 31:e58. [PMID: 28902238 DOI: 10.1590/1807-3107bor-2017.vol31.0058] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 05/22/2017] [Indexed: 11/22/2022] Open
Abstract
The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and composite materials with optimized properties, i.e., good mechanical properties, appropriate wear behavior and acceptable aesthetic characteristics. The objective of this literature review is to discuss the main advantages and disadvantages of the new ceramic systems and processing methods. The manuscript is divided in five parts: I) monolithic zirconia restorations; II) multilayered dental prostheses; III) new glass-ceramics; IV) polymer infiltrated ceramics; and V) novel processing technologies. Dental ceramics and processing technologies have evolved significantly in the past ten years, with most of the evolution being related to new microstructures and CAD-CAM methods. In addition, a trend towards the use of monolithic restorations has changed the way clinicians produce all-ceramic dental prostheses, since the more aesthetic multilayered restorations unfortunately are more prone to chipping or delamination. Composite materials processed via CAD-CAM have become an interesting option, as they have intermediate properties between ceramics and polymers and are more easily milled and polished.
Collapse
Affiliation(s)
- Lucas Hian da Silva
- Universidade Cidade de São Paulo - Unicid, School of Dentistry, São Paulo, SP, Brazil
| | - Erick de Lima
- Universidade de São Paulo - USP, School of Dentistry, Department of Biomaterials and Oral Biology, São Paulo, SP, Brazil
| | | | - Stéphanie Soares Favero
- Universidade de São Paulo - USP, School of Dentistry, Department of Biomaterials and Oral Biology, São Paulo, SP, Brazil
| | - Ulrich Lohbauer
- Friedrich-Alexander-Universität Erlangen-Nürnberg - FAU, Dental Clinic 1, Erlangen, Germany
| | - Paulo Francisco Cesar
- Universidade de São Paulo - USP, School of Dentistry, Department of Biomaterials and Oral Biology, São Paulo, SP, Brazil
| |
Collapse
|
572
|
Wu CS, Liao HT. Fabrication, characterization, and application of polyester/wood flour composites. JOURNAL OF POLYMER ENGINEERING 2017. [DOI: 10.1515/polyeng-2016-0284] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The mechanical properties, thermal properties, antibacterial activity, and fabrication of three-dimensional (3D) printing strips of composite materials containing polyhydroxyalkanoate (PHA) and wood flour (WF) were evaluated. Maleic anhydride (MA)-grafted PHA (PHA-g-MA) and WF were used to enhance the desired characteristics of these composites. The PHA-g-MA/WF composites had better mechanical properties than the PHA/WF composites did. This effect was attributed to a greater compatibility between the grafted polyester and WF. Additionally, the PHA-g-MA/WF composites provided higher quality 3D printing strips and were more easily processed because of ester formation. The water resistance of the PHA-g-MA/WF composite was greater than that of PHA/WF. Moreover, WF enhanced the antibacterial activity of the composites. Composites of PHA-g-MA or PHA containing WF had better antibacterial activity.
Collapse
|
573
|
Pekkanen AM, Mondschein RJ, Williams CB, Long TE. 3D Printing Polymers with Supramolecular Functionality for Biological Applications. Biomacromolecules 2017; 18:2669-2687. [PMID: 28762718 DOI: 10.1021/acs.biomac.7b00671] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Supramolecular chemistry continues to experience widespread growth, as fine-tuned chemical structures lead to well-defined bulk materials. Previous literature described the roles of hydrogen bonding, ionic aggregation, guest/host interactions, and π-π stacking to tune mechanical, viscoelastic, and processing performance. The versatility of reversible interactions enables the more facile manufacturing of molded parts with tailored hierarchical structures such as tissue engineered scaffolds for biological applications. Recently, supramolecular polymers and additive manufacturing processes merged to provide parts with control of the molecular, macromolecular, and feature length scales. Additive manufacturing, or 3D printing, generates customizable constructs desirable for many applications, and the introduction of supramolecular interactions will potentially increase production speed, offer a tunable surface structure for controlling cell/scaffold interactions, and impart desired mechanical properties through reinforcing interlayer adhesion and introducing gradients or self-assembled structures. This review details the synthesis and characterization of supramolecular polymers suitable for additive manufacture and biomedical applications as well as the use of supramolecular polymers in additive manufacturing for drug delivery and complex tissue scaffold formation. The effect of supramolecular assembly and its dynamic behavior offers potential for controlling the anisotropy of the printed objects with exquisite geometrical control. The potential for supramolecular polymers to generate well-defined parts, hierarchical structures, and scaffolds with gradient properties/tuned surfaces provides an avenue for developing next-generation biomedical devices and tissue scaffolds.
Collapse
Affiliation(s)
- Allison M Pekkanen
- School of Biomedical Engineering and Sciences, Virginia Tech , Blacksburg, Virginia 24061, United States.,Macromolecules Innovation Institute (MII), Virginia Tech , Blacksburg, Virginia 24061, United States
| | - Ryan J Mondschein
- Macromolecules Innovation Institute (MII), Virginia Tech , Blacksburg, Virginia 24061, United States.,Department of Chemistry, Virginia Tech , Blacksburg, Virginia 24061, United States
| | - Christopher B Williams
- Macromolecules Innovation Institute (MII), Virginia Tech , Blacksburg, Virginia 24061, United States.,Department of Mechanical Engineering, Virginia Tech , Blacksburg, Virginia 24061, United States
| | - Timothy E Long
- Macromolecules Innovation Institute (MII), Virginia Tech , Blacksburg, Virginia 24061, United States.,Department of Chemistry, Virginia Tech , Blacksburg, Virginia 24061, United States
| |
Collapse
|
574
|
Shah PK, Stansbury JW, Bowman CN. Application of an Addition-Fragmentation-Chain Transfer Monomer in Di(meth)acrylate Network Formation to Reduce Polymerization Shrinkage Stress. Polym Chem 2017; 8:4339-4351. [PMID: 29104618 PMCID: PMC5665588 DOI: 10.1039/c7py00702g] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new addition-fragmentation chain transfer (AFT) capable moiety was incorporated into a dimethacrylate monomer that participated readily in network formation by copolymerizing with multifunctional methacrylates or acrylates. The process of AFT occurred simultaneously with photopolymerization of the AFT monomer (AFM) and other (meth)acrylate monomers leading to polymer stress relaxation via network reconfiguration. At low loading levels of the AFM, a significant reduction in shrinkage stress, especially for acrylate monomers, was observed with nominal effects on conversion. At higher loading levels of the AFM, the photopolymerization reaction kinetics and final double bond conversion were significantly lowered along with a delay in the gel-point conversion. Electron paramagnetic resonance studies during polymerization revealed the presence of a distinct radical species that was present in proportional quantities to the AFM content in the system. The lifetime and the character of the persistent radicals were altered due to the presence of the distinctive radical, in turn affecting the polymerization kinetics. With polymerization conducted at higher irradiance, the differential conversion between the control resin and samples with moderate AFM content was minimal, especially for the methacrylate-based formulations.
Collapse
Affiliation(s)
- Parag K Shah
- Department of Chemical and Biological Engineering, University of Colorado Boulder
| | - Jeffrey W Stansbury
- Department of Chemical and Biological Engineering, University of Colorado Boulder
- School of Dental Medicine, University of Colorado Denver
| | - Christopher N Bowman
- Department of Chemical and Biological Engineering, University of Colorado Boulder
| |
Collapse
|
575
|
Ligon SC, Liska R, Stampfl J, Gurr M, Mülhaupt R. Polymers for 3D Printing and Customized Additive Manufacturing. Chem Rev 2017; 117:10212-10290. [PMID: 28756658 PMCID: PMC5553103 DOI: 10.1021/acs.chemrev.7b00074] [Citation(s) in RCA: 1158] [Impact Index Per Article: 165.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Indexed: 02/06/2023]
Abstract
Additive manufacturing (AM) alias 3D printing translates computer-aided design (CAD) virtual 3D models into physical objects. By digital slicing of CAD, 3D scan, or tomography data, AM builds objects layer by layer without the need for molds or machining. AM enables decentralized fabrication of customized objects on demand by exploiting digital information storage and retrieval via the Internet. The ongoing transition from rapid prototyping to rapid manufacturing prompts new challenges for mechanical engineers and materials scientists alike. Because polymers are by far the most utilized class of materials for AM, this Review focuses on polymer processing and the development of polymers and advanced polymer systems specifically for AM. AM techniques covered include vat photopolymerization (stereolithography), powder bed fusion (SLS), material and binder jetting (inkjet and aerosol 3D printing), sheet lamination (LOM), extrusion (FDM, 3D dispensing, 3D fiber deposition, and 3D plotting), and 3D bioprinting. The range of polymers used in AM encompasses thermoplastics, thermosets, elastomers, hydrogels, functional polymers, polymer blends, composites, and biological systems. Aspects of polymer design, additives, and processing parameters as they relate to enhancing build speed and improving accuracy, functionality, surface finish, stability, mechanical properties, and porosity are addressed. Selected applications demonstrate how polymer-based AM is being exploited in lightweight engineering, architecture, food processing, optics, energy technology, dentistry, drug delivery, and personalized medicine. Unparalleled by metals and ceramics, polymer-based AM plays a key role in the emerging AM of advanced multifunctional and multimaterial systems including living biological systems as well as life-like synthetic systems.
Collapse
Affiliation(s)
- Samuel Clark Ligon
- Laboratory
for High Performance Ceramics, Empa, The
Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
- Institute of Applied
Synthetic Chemistry and Institute of Materials Science and
Technology, TU Wien, Getreidemarkt 9, Vienna A-1060, Austria
| | - Robert Liska
- Institute of Applied
Synthetic Chemistry and Institute of Materials Science and
Technology, TU Wien, Getreidemarkt 9, Vienna A-1060, Austria
| | - Jürgen Stampfl
- Institute of Applied
Synthetic Chemistry and Institute of Materials Science and
Technology, TU Wien, Getreidemarkt 9, Vienna A-1060, Austria
| | - Matthias Gurr
- H.
B. Fuller Deutschland GmbH, An der Roten Bleiche 2-3, Lüneburg D-21335, Germany
| | - Rolf Mülhaupt
- Freiburg
Materials Research Center (FMF) and Institute for Macromolecular Chemistry, Albert-Ludwigs-University Freiburg, Stefan-Meier-Straße 31, Freiburg D-79104, Germany
| |
Collapse
|
576
|
Ligon SC, Liska R, Stampfl J, Gurr M, Mülhaupt R. Polymers for 3D Printing and Customized Additive Manufacturing. Chem Rev 2017. [DOI: 10.1021/acs.chemrev.7b00074 impact factor 2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Samuel Clark Ligon
- Laboratory
for High Performance Ceramics, Empa, The Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
| | | | | | - Matthias Gurr
- H. B. Fuller Deutschland GmbH, An der Roten Bleiche 2-3, Lüneburg D-21335, Germany
| | - Rolf Mülhaupt
- Freiburg
Materials Research Center (FMF) and Institute for Macromolecular Chemistry, Albert-Ludwigs-University Freiburg, Stefan-Meier-Straße 31, Freiburg D-79104, Germany
| |
Collapse
|
577
|
Feng X, Yang Z, Chmely S, Wang Q, Wang S, Xie Y. Lignin-coated cellulose nanocrystal filled methacrylate composites prepared via 3D stereolithography printing: Mechanical reinforcement and thermal stabilization. Carbohydr Polym 2017; 169:272-281. [DOI: 10.1016/j.carbpol.2017.04.001] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 03/17/2017] [Accepted: 04/01/2017] [Indexed: 02/03/2023]
|
578
|
Abstract
Three-dimensional (3D) printing enables the production of anatomically matched and patient-specific devices and constructs with high tunability and complexity. It also allows on-demand fabrication with high productivity in a cost-effective manner. As a result, 3D printing has become a leading manufacturing technique in healthcare and medicine for a wide range of applications including dentistry, tissue engineering and regenerative medicine, engineered tissue models, medical devices, anatomical models and drug formulation. Today, 3D printing is widely adopted by the healthcare industry and academia. It provides commercially available medical products and a platform for emerging research areas including tissue and organ printing. In this review, our goal is to discuss the current and emerging applications of 3D printing in medicine. A brief summary on additive manufacturing technologies and available printable materials is also given. The technological and regulatory barriers that are slowing down the full implementation of 3D printing in the medical field are also discussed.
Collapse
Affiliation(s)
- Chya-Yan Liaw
- Instructive Biomaterials and Additive Manufacturing Laboratory, Otto H. York Department of Chemical, Biological and Pharmaceutical Engineering, and Department of Bioengineering, New Jersey Institute of Technology, Newark, United States of America
| | | |
Collapse
|
579
|
Demirörs AF, Crassous JJ. Colloidal assembly and 3D shaping by dielectrophoretic confinement. SOFT MATTER 2017; 13:3182-3189. [PMID: 28397927 DOI: 10.1039/c7sm00422b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
For decades, scientists and engineers have strived to design means of assembling colloids into ordered structures. By now, the literature is quite peppered with reports of colloidal assemblies. However, the available methods can assemble only a narrow range of structures or are applicable to specific types of colloids. There are still only few generic methods that would lead to arbitrary colloidal arrays or would shape colloidal assemblies into predesigned structures. Here, we first discuss in detail how to spatially control the assembly and crystallization of colloids through the balance of dielectrophoretic and dipolar forces. Furthermore, we demonstrate how to flexibly program and shape arrays of 3D microstructures that can be permanently affixed by in situ UV polymerization and calcination by using two facing similar or distinct micro-fabricated electrodes.
Collapse
Affiliation(s)
- Ahmet Faik Demirörs
- Complex Materials, Department of Materials, ETH Zürich, Vladimir Prelog Weg 5, 8093, Zürich, Switzerland.
| | | |
Collapse
|
580
|
Purnama AR, Hennessy MG, Vitale A, Cabral JT. Coarse-grained models for frontal photopolymerization with evolving conversion profile. POLYM INT 2017. [DOI: 10.1002/pi.5344] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | | | | | - João T Cabral
- Department of Chemical Engineering; Imperial College London; UK
| |
Collapse
|
581
|
Whitley D, Eidson RS, Rudek I, Bencharit S. In-office fabrication of dental implant surgical guides using desktop stereolithographic printing and implant treatment planning software: A clinical report. J Prosthet Dent 2017; 118:256-263. [PMID: 28222882 DOI: 10.1016/j.prosdent.2016.10.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 10/13/2016] [Accepted: 10/13/2016] [Indexed: 12/27/2022]
Abstract
Guided surgery is accepted as the most accurate way to place an implant and predictably relate the implant to its definitive prosthesis, although few clinicians use it. However, recent developments in high-quality desktop 3-dimensional stereolithographic printers have led to the in-office fabrication of stereolithographic surgical guides at reduced cost. This clinical report demonstrates a protocol for using a cost-effective, in-office rapid prototyping technique to fabricate a surgical guide for dental implant placement.
Collapse
Affiliation(s)
| | - R Scott Eidson
- Clinical Associate Professor, Department of Operative Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, N.C
| | - Ivan Rudek
- Research Assistant Professor, General and Oral Health Center, Department of Periodontics, University of North Carolina at Chapel Hill, Chapel Hill, N.C
| | - Sompop Bencharit
- Associate Professor and Director, Digital Dentistry Technologies, Department of General Practice and Department of Oral and Maxillofacial Surgery, School of Dentistry, and Department of Biomedical Engineering, School of Engineering, Virginia Commonwealth University, Richmond, Va.
| |
Collapse
|
582
|
Zhou G, Han Q, Tai J, Liu B, Zhang J, Wang K, Ni X, Wang P, Liu X, Jiao A, Wang S, Li X, Zhang J, Fan Y. Digital light procession three-dimensional printing acrylate/collagen composite airway stent for tracheomalacia. J BIOACT COMPAT POL 2017. [DOI: 10.1177/0883911516686090] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Recently, more and more researchers have focused on airway stent applied in tracheomalacia. The airway stents for clinical application were usually manufactured in accordance with a fixed pattern, which were difficult to perfect match with children, especially infants. Digital light procession of light curing acrylate resin implantation showed higher accuracy and printing speed over traditional three-dimensional printing techniques. In this article, a novel personalized airway stent was developed by digital light procession three-dimensional printing and was modified by collagen I extracted from the fish scales. The morphology of the collagen-modified airway stent was examined by scanning electron microscopy, and the chemical structures were examined by attenuated total internal reflectance Fourier transform infrared spectroscopy. The biocompatibility of this synthetic acrylate/collagen composite airway stent was characterized by water contact angle test and cell culture. The results confirmed that the composite airway stent was hydrophilic and non-cytotoxic toward a cultured human bronchial epithelial cell line with good cell viability and show excellent physicochemical and biological properties. In conclusion, this study presented the three-dimensional printing composite acrylate and collagen airway stent may have potential in customized treatment for tracheomalacia.
Collapse
Affiliation(s)
- Gang Zhou
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Qianyi Han
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Jun Tai
- Beijing Key Laboratory for Pediatric Diseases of Otolaryngology, Head and Neck Surgery, Beijing Pediatric Research Institute, Beijing Children’s Hospital, Capital Medical University, Beijing, China
- Department of Otolaryngology, Head and Neck Surgery, Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Beibei Liu
- School of Material Science and Engineering, Beihang University, Beijing, China
| | - Jing Zhang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Kunpeng Wang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Xin Ni
- Beijing Key Laboratory for Pediatric Diseases of Otolaryngology, Head and Neck Surgery, Beijing Pediatric Research Institute, Beijing Children’s Hospital, Capital Medical University, Beijing, China
- Department of Otolaryngology, Head and Neck Surgery, Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Pengpeng Wang
- Beijing Key Laboratory for Pediatric Diseases of Otolaryngology, Head and Neck Surgery, Beijing Pediatric Research Institute, Beijing Children’s Hospital, Capital Medical University, Beijing, China
- Department of Otolaryngology, Head and Neck Surgery, Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Xicheng Liu
- Beijing Key Laboratory for Pediatric Diseases of Otolaryngology, Head and Neck Surgery, Beijing Pediatric Research Institute, Beijing Children’s Hospital, Capital Medical University, Beijing, China
- Department of Otolaryngology, Head and Neck Surgery, Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Anxia Jiao
- Beijing Key Laboratory for Pediatric Diseases of Otolaryngology, Head and Neck Surgery, Beijing Pediatric Research Institute, Beijing Children’s Hospital, Capital Medical University, Beijing, China
- Department of Otolaryngology, Head and Neck Surgery, Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Shengcai Wang
- Beijing Key Laboratory for Pediatric Diseases of Otolaryngology, Head and Neck Surgery, Beijing Pediatric Research Institute, Beijing Children’s Hospital, Capital Medical University, Beijing, China
- Department of Otolaryngology, Head and Neck Surgery, Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Xiaodan Li
- Beijing Key Laboratory for Pediatric Diseases of Otolaryngology, Head and Neck Surgery, Beijing Pediatric Research Institute, Beijing Children’s Hospital, Capital Medical University, Beijing, China
- Department of Otolaryngology, Head and Neck Surgery, Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Jie Zhang
- Beijing Key Laboratory for Pediatric Diseases of Otolaryngology, Head and Neck Surgery, Beijing Pediatric Research Institute, Beijing Children’s Hospital, Capital Medical University, Beijing, China
- Department of Otolaryngology, Head and Neck Surgery, Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- National Research Center for Rehabilitation Technical Aids, Beijing, China
| |
Collapse
|
583
|
Mai HN, Lee KB, Lee DH. Fit of interim crowns fabricated using photopolymer-jetting 3D printing. J Prosthet Dent 2017; 118:208-215. [PMID: 28089333 DOI: 10.1016/j.prosdent.2016.10.030] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 10/25/2016] [Accepted: 10/26/2016] [Indexed: 11/27/2022]
Abstract
STATEMENT OF PROBLEM The fit of interim crowns fabricated using 3-dimensional (3D) printing is unknown. PURPOSE The purpose of this in vitro study was to evaluate the fit of interim crowns fabricated using photopolymer-jetting 3D printing and to compare it with that of milling and compression molding methods. MATERIAL AND METHODS Twelve study models were fabricated by making an impression of a metal master model of the mandibular first molar. On each study model, interim crowns (N=36) were fabricated using compression molding (molding group, n=12), milling (milling group, n=12), and 3D polymer-jetting methods. The crowns were prepared as follows: molding group, overimpression technique; milling group, a 5-axis dental milling machine; and polymer-jetting group using a 3D printer. The fit of interim crowns was evaluated in the proximal, marginal, internal axial, and internal occlusal regions by using the image-superimposition and silicone-replica techniques. The Mann-Whitney U test and Kruskal-Wallis tests were used to compare the results among groups (α=.05). RESULTS Compared with the molding group, the milling and polymer-jetting groups showed more accurate results in the proximal and marginal regions (P<.001). In the axial regions, even though the mean discrepancy was smallest in the molding group, the data showed large deviations. In the occlusal region, the polymer-jetting group was the most accurate, and compared with the other groups, the milling group showed larger internal discrepancies (P<.001). CONCLUSIONS Polymer-jet 3D printing significantly enhanced the fit of interim crowns, particularly in the occlusal region.
Collapse
Affiliation(s)
- Hang-Nga Mai
- Graduate student, Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
| | - Kyu-Bok Lee
- Professor, Department of Prosthodontics, School of Dentistry, A3DI, Kyungpook National University, Daegu, Republic of Korea
| | - Du-Hyeong Lee
- Assistant Professor, Department of Prosthodontics, School of Dentistry, A3DI, Kyungpook National University, Daegu, Republic of Korea.
| |
Collapse
|
584
|
Wei H, Zhang Q, Yao Y, Liu L, Liu Y, Leng J. Direct-Write Fabrication of 4D Active Shape-Changing Structures Based on a Shape Memory Polymer and Its Nanocomposite. ACS APPLIED MATERIALS & INTERFACES 2017; 9:876-883. [PMID: 27997104 DOI: 10.1021/acsami.6b12824] [Citation(s) in RCA: 158] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Four-dimensional (4D) active shape-changing structures based on shape memory polymers (SMPs) and shape memory nanocomposites (SMNCs) are able to be controlled in both space and time and have attracted increasing attention worldwide. However, conventional processing approaches have restricted the design space of such smart structures. Herein, 4D active shape-changing architectures in custom-defined geometries exhibiting thermally and remotely actuated behaviors are achieved by direct-write printing of ultraviolet (UV) cross-linking poly(lactic acid)-based inks. The results reveal that, by the introduction of a UV cross-linking agent, the printed objects present excellent shape memory behavior, which enables three-dimensional (3D)-one-dimensional (1D)-3D, 3D-two-dimensional (2D)-3D, and 3D-3D-3D configuration transformations. More importantly, the addition of iron oxide successfully integrates 4D shape-changing objects with fast remotely actuated and magnetically guidable properties. This research realizes the printing of both SMPs and SMNCs, which present an effective strategy to design 4D active shape-changing architectures with multifunctional properties. This paves the way for the further development of 4D printing, soft robotics, flexible electronics, minimally invasive medicine, etc.
Collapse
Affiliation(s)
- Hongqiu Wei
- Center for Composite Materials and Structures and ‡Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT) , Harbin 150080, People's Republic of China
| | - Qiwei Zhang
- Center for Composite Materials and Structures and ‡Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT) , Harbin 150080, People's Republic of China
| | - Yongtao Yao
- Center for Composite Materials and Structures and ‡Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT) , Harbin 150080, People's Republic of China
| | - Liwu Liu
- Center for Composite Materials and Structures and ‡Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT) , Harbin 150080, People's Republic of China
| | - Yanju Liu
- Center for Composite Materials and Structures and ‡Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT) , Harbin 150080, People's Republic of China
| | - Jinsong Leng
- Center for Composite Materials and Structures and ‡Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT) , Harbin 150080, People's Republic of China
| |
Collapse
|
585
|
Kumar S, Wardle BL, Arif MF. Strength and Performance Enhancement of Bonded Joints by Spatial Tailoring of Adhesive Compliance via 3D Printing. ACS APPLIED MATERIALS & INTERFACES 2017; 9:884-891. [PMID: 27966344 DOI: 10.1021/acsami.6b13038] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Adhesive bonding continues to emerge as a preferred route for joining materials with broad applications including advanced structures, microelectronics, biomedical systems, and consumer goods. Here, we study the mechanics of deformation and failure of tensile-loaded single-lap joints with a compliance-tailored adhesive. Tailoring of the adhesive compliance redistributes stresses and strains to reduce both shear and peel concentrations at the ends of the adhesive that determine failure of the joint. Utilizing 3D printing, the modulus of the adhesive is spatially varied along the bondlength. Experimental strength testing, including optical strain mapping, reveals that the strain redistribution results in a greater than 100% increase in strength and toughness concomitant with a 50% increase in strain-to-break while maintaining joint stiffness. The tailoring demonstrated here is immediately realizable in a broad array of 3D printing applications, and the level of performance enhancement suggests that compliance tailoring of the adhesive is a generalizable route for achieving superior performance of joints in other applications, such as advanced structural composites.
Collapse
Affiliation(s)
- S Kumar
- Institute Center for Energy (iEnergy), Department of Mechanical and Materials Engineering, Masdar Institute of Science and Technology , Abu Dhabi 54224, United Arab Emirates
| | - Brian L Wardle
- Department of Aeronautics and Astronautics, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Muhamad F Arif
- Institute Center for Energy (iEnergy), Department of Mechanical and Materials Engineering, Masdar Institute of Science and Technology , Abu Dhabi 54224, United Arab Emirates
| |
Collapse
|
586
|
|
587
|
Abstract
This review focuses on the relationship between the structures and properties of various polymers for different applications in dentistry.
Collapse
Affiliation(s)
- Xinyuan Xu
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu
- China
| | - Libang He
- State Key Laboratory of Oral Diseases
- West China Hospital of Stomatology
- Sichuan University
- Chengdu
- China
| | - Bengao Zhu
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu
- China
| | - Jiyao Li
- State Key Laboratory of Oral Diseases
- West China Hospital of Stomatology
- Sichuan University
- Chengdu
- China
| | - Jianshu Li
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu
- China
| |
Collapse
|
588
|
Cui H, Nowicki M, Fisher JP, Zhang LG. 3D Bioprinting for Organ Regeneration. Adv Healthc Mater 2017; 6:10.1002/adhm.201601118. [PMID: 27995751 PMCID: PMC5313259 DOI: 10.1002/adhm.201601118] [Citation(s) in RCA: 273] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 10/26/2016] [Indexed: 12/19/2022]
Abstract
Regenerative medicine holds the promise of engineering functional tissues or organs to heal or replace abnormal and necrotic tissues/organs, offering hope for filling the gap between organ shortage and transplantation needs. Three-dimensional (3D) bioprinting is evolving into an unparalleled biomanufacturing technology due to its high-integration potential for patient-specific designs, precise and rapid manufacturing capabilities with high resolution, and unprecedented versatility. It enables precise control over multiple compositions, spatial distributions, and architectural accuracy/complexity, therefore achieving effective recapitulation of microstructure, architecture, mechanical properties, and biological functions of target tissues and organs. Here we provide an overview of recent advances in 3D bioprinting technology, as well as design concepts of bioinks suitable for the bioprinting process. We focus on the applications of this technology for engineering living organs, focusing more specifically on vasculature, neural networks, the heart and liver. We conclude with current challenges and the technical perspective for further development of 3D organ bioprinting.
Collapse
Affiliation(s)
- Haitao Cui
- Department of Mechanical and Aerospace Engineering, The George Washington University, 3590 Science and Engineering Hall, 800 22nd Street NW, Washington, DC 20052, USA
| | - Margaret Nowicki
- Department of Biomedical Engineering, The George Washington University, 3590 Science and Engineering Hall, 800 22nd Street NW, Washington, DC 20052, USA
| | - John P. Fisher
- Department of Bioengineering University of Maryland 3238 Jeong H. Kim Engineering Building College Park, MD 20742, USA
| | - Lijie Grace Zhang
- Department of Medicine, The George Washington University, 3590 Science and Engineering Hall, 800 22nd Street NW, Washington, DC 20052, USA
| |
Collapse
|
589
|
Preparation, morphology and superior performances of biobased thermoplastic elastomer by in situ dynamical vulcanization for 3D-printed materials. POLYMER 2017. [DOI: 10.1016/j.polymer.2016.11.045] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
590
|
Shamseddine L, Mortada R, Rifai K, Chidiac JJ. Fit of pressed crowns fabricated from two CAD-CAM wax pattern process plans: A comparative in vitro study. J Prosthet Dent 2016; 118:49-54. [PMID: 28024815 DOI: 10.1016/j.prosdent.2016.10.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 10/04/2016] [Accepted: 10/04/2016] [Indexed: 10/20/2022]
Abstract
STATEMENT OF PROBLEM Subtractive and additive computer-aided design and computer-aided manufacturing (CAD-CAM) wax pattern processing are 2 methods of fabricating a pressed ceramic crown. Whether a subtractive milled wax pattern or a pattern from the micro-stereolithography additive process produces lithium disilicate crowns with better marginal and internal fit is unclear. MATERIALS AND METHODS Ten silicone impressions were made for a prepared canine tooth. Each die received 2 lithium disilicate (IPS e.max) copings, 1 from milled wax blocks and 1 from additive wax. The replica technique was used to measure the fit by scanning electron microscopy at ×80 magnification. Collected data were analyzed using the paired Student t test for the marginal and internal fit. For the occlusal fit, the difference in scores did not follow a normal distribution, and the Wilcoxon signed rank test was used (α=.05). RESULTS The mean marginal, axial, and occlusal fit showed no significant differences when the 2 CAD-CAM manufacturing processes were compared (P>.05). For the marginal fit, the mean (±SD) values were 105.1 μm ±39.6 with the milled process and 126.2 μm ±25.2 for the additive process. The mean values were 98.1 μm ±26.1 for the axial fit in the milled process and 106.8 μm ±21.2 in the additive process. For the occlusal fit, median values (interquartile interval) were 199.0 μm (141.5 to 269.9) for subtractive manufacturing and 257.2 μm (171.6 to 266.0) for micro-SLA manufacturing. CONCLUSIONS No significant difference was found between the fit of the 2 techniques. The mean values of axial and occlusal median values were 10 and 5 to 6 times greater than machine's nominal values.
Collapse
Affiliation(s)
- Loubna Shamseddine
- Assistant Professor, Prosthodontics Department, Lebanese University School of Dentistry, Beirut, Lebanon.
| | - Rola Mortada
- Clinical instructor, Prosthodontics Department, Lebanese University School of Dentistry, Beirut, Lebanon
| | - Khaldoun Rifai
- Professor, Prosthodontics Department, Lebanese University School of Dentistry, Beirut, Lebanon
| | - Jose Johann Chidiac
- Professor, Prosthodontics Department, Lebanese University School of Dentistry, Beirut, Lebanon
| |
Collapse
|
591
|
|
592
|
Wu CS. Modulation, functionality, and cytocompatibility of three-dimensional printing materials made from chitosan-based polysaccharide composites. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 69:27-36. [DOI: 10.1016/j.msec.2016.06.062] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Revised: 06/13/2016] [Accepted: 06/20/2016] [Indexed: 10/21/2022]
|
593
|
Affiliation(s)
- Bethany Gross
- Department of Chemistry, Michigan State University, East
Lansing, Michigan 48824, United States
| | - Sarah Y. Lockwood
- Department of Chemistry, Michigan State University, East
Lansing, Michigan 48824, United States
| | - Dana M. Spence
- Department of Chemistry, Michigan State University, East
Lansing, Michigan 48824, United States
| |
Collapse
|
594
|
Newcomb TL, Bruhn AM, Giles B, Garcia HM, Diawara N. Testing a Novel 3D Printed Radiographic Imaging Device for Use in Forensic Odontology. J Forensic Sci 2016; 62:223-228. [PMID: 27859228 DOI: 10.1111/1556-4029.13230] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 03/28/2016] [Accepted: 04/02/2016] [Indexed: 10/20/2022]
Abstract
There are specific challenges related to forensic dental radiology and difficulties in aligning X-ray equipment to teeth of interest. Researchers used 3D printing to create a new device, the combined holding and aiming device (CHAD), to address the positioning limitations of current dental X-ray devices. Participants (N = 24) used the CHAD, soft dental wax, and a modified external aiming device (MEAD) to determine device preference, radiographer's efficiency, and technique errors. Each participant exposed six X-rays per device for a total of 432 X-rays scored. A significant difference was found at the 0.05 level between the three devices (p = 0.0015), with the MEAD having the least amount of total errors and soft dental wax taking the least amount of time. Total errors were highest when participants used soft dental wax-both the MEAD and the CHAD performed best overall. Further research in forensic dental radiology and use of holding devices is needed.
Collapse
Affiliation(s)
- Tara L Newcomb
- School of Dental Hygiene, College of Health Sciences, Old Dominion University, Norfolk, VA, 23529
| | - Ann M Bruhn
- School of Dental Hygiene, College of Health Sciences, Old Dominion University, Norfolk, VA, 23529
| | - Bridget Giles
- Virginia Modeling, Analysis & Simulation Center, Old Dominion University, Suffolk, VA, 23535
| | - Hector M Garcia
- Virginia Modeling, Analysis & Simulation Center, Old Dominion University, Suffolk, VA, 23535
| | - Norou Diawara
- Mathematics and Statistics, Old Dominion University, Norfolk, VA, 23529
| |
Collapse
|
595
|
Salami E, Ganesan PB, Ward TA, Viyapuri R, Romli FI. Design and mechanical analysis of a 3D-printed biodegradable biomimetic micro air vehicle wing. ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1757-899x/152/1/012014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
596
|
Wu CS, Liao HT. Polyester-based green composites for three-dimensional printing strips: preparation, characterization and antibacterial properties. Polym Bull (Berl) 2016. [DOI: 10.1007/s00289-016-1836-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
597
|
Tang Y, Zhang Y, Yang J, Nie J. Synthesis and characteristics of photopolymerized benzophenone. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/pola.28386] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yunhui Tang
- State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 People's Republic of China
| | - Yuxuan Zhang
- Changzhou Advanced Materials Research Institute, Beijing University of Chemical Technology; Changzhou 213164 People's Republic of China
| | - Jinliang Yang
- Changzhou Advanced Materials Research Institute, Beijing University of Chemical Technology; Changzhou 213164 People's Republic of China
| | - Jun Nie
- State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 People's Republic of China
| |
Collapse
|
598
|
Pan GT, Chong S, Tsai HJ, Lu WH, Yang TCK. The Effects of Iron, Silicon, Chromium, and Aluminum Additions on the Physical and Mechanical Properties of Recycled 3D Printing Filaments. ADVANCES IN POLYMER TECHNOLOGY 2016. [DOI: 10.1002/adv.21777] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Guan-Ting Pan
- Department of Chemical Engineering and Biotechnology; National Taipei University of Technology; Taipei City 106 Taiwan
| | - Siewhui Chong
- Department of Chemical and Environmental Engineering; University of Nottingham Malaysia Campus; 43500 Selangor Malaysia
| | - Hsuan-Ju Tsai
- Department of Chemical Engineering and Biotechnology; National Taipei University of Technology; Taipei City 106 Taiwan
| | - Wei-Hua Lu
- Graduate Institute of Materials Engineering; National Pingtung University of Science and Technology; Pingtung 912 Taiwan
| | - Thomas C.-K. Yang
- Department of Chemical Engineering and Biotechnology; National Taipei University of Technology; Taipei City 106 Taiwan
| |
Collapse
|
599
|
Frontal Conversion and Uniformity in 3D Printing by Photopolymerisation. MATERIALS 2016; 9:ma9090760. [PMID: 28773881 PMCID: PMC5457111 DOI: 10.3390/ma9090760] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 08/31/2016] [Accepted: 09/02/2016] [Indexed: 11/16/2022]
Abstract
We investigate the impact of the non-uniform spatio-temporal conversion, intrinsic to photopolymerisation, in the context of light-driven 3D printing of polymers. The polymerisation kinetics of a series of model acrylate and thiol-ene systems, both neat and doped with a light-absorbing dye, is investigated experimentally and analysed according to a descriptive coarse-grained model for photopolymerisation. In particular, we focus on the relative kinetics of polymerisation with those of 3D printing, by comparing the evolution of the position of the conversion profile (zf) to the sequential displacement of the object stage (∆z). After quantifying the characteristic sigmoidal monomer-to-polymer conversion of the various systems, with a combination of patterning experiments, FT-IR mapping, and modelling, we compute representative regimes for which zf is smaller, commensurate with, or larger than ∆z. While non-monotonic conversion can be detrimental to 3D printing, for instance in causing differential shrinkage of inhomogeneity in material properties, we identify opportunities for facile fabrication of modulated materials in the z-direction (i.e., along the illuminated axis). Our simple framework and model, based on directly measured parameters, can thus be employed in photopolymerisation-based 3D printing, both in process optimisation and in the precise design of complex, internally stratified materials by coupling the z-stage displacement and frontal polymerisation kinetics.
Collapse
|
600
|
Rahman SU, Arany PR. 3D bioprinting: prostheses-restorations…now, tissues and organ systems! Oral Dis 2016; 23:404-408. [PMID: 27318018 DOI: 10.1111/odi.12525] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- S U Rahman
- Oral Biology, School of Dental Medicine, University at Buffalo, Buffalo, NY, USA
| | - P R Arany
- Oral Biology, School of Dental Medicine, University at Buffalo, Buffalo, NY, USA
| |
Collapse
|