scholarly journals Polymethylmethacrylate cranioplasty implant customized using a polylactic acid mold and prepared with a 3D printer: an example case

2021 ◽  
Author(s):  
Gökhan GÜRKAN ◽  
R. Bugra HUSEMOGLU ◽  
Nurullah YUCEER
Keyword(s):  
Polylactic Acid ◽  
3D Printer

scholarly journals Supercritical Impregnation of PLA Filaments with Mango Leaf Extract to Manufacture Functionalized Biomedical Devices by 3D Printing

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2125
Author(s):  
José María Rosales ◽  
Cristina Cejudo ◽  
Lidia Verano ◽  
Lourdes Casas ◽  
Casimiro Mantell ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
3D Printing ◽  
Polylactic Acid ◽  
Leaf Extract ◽  
Three Dimensional ◽  
3D Printer ◽  
Pharmacological Properties ◽  
Bioactive Properties ◽  
Supercritical Impregnation ◽  
Mango Leaves

Polylactic Acid (PLA) filaments impregnated with ethanolic mango leaves extract (MLE) with pharmacological properties were obtained by supercritical impregnation. The effects of pressure, temperature and amount of extract on the response variables, i.e., swelling, extract loading and bioactivity of the PLA filaments, were determined. The analysis of the filaments biocapacities revealed that impregnated PLA filaments showed 11.07% antidenaturant capacity and 88.13% antioxidant activity, which after a 9-day incubation shifted to 30.10% and 9.90%, respectively. Subsequently, the same tests were conducted on printed samples. Before their incubation, the printed samples showed 79.09% antioxidant activity and no antidenaturant capacity was detected. However, after their incubation, the antioxidant activity went down to only 2.50%, while the antidenaturant capacity raised up to 23.50%. The persistence of the bioactive properties after printing opens the possibility of using the functionalized PLA filaments as the feed for a three-dimensional (3D) printer.

Fabrication of Bioactive Polylactic Acid Composite Formed by 3D Printer

2014 ◽  
Vol 631 ◽  
pp. 160-165
Author(s):  
Ryoki Karashima ◽  
Takeshi Yabutsuka ◽  
Takeshi Yao
Keyword(s):  
Polylactic Acid ◽  
3D Printer ◽  
Cold Isostatic Press

We precipitated Apatite Nucleus (AN) by raising pH of SBF. We mixed various concentration of AN in polylactic acid (PLA) and pressed by uniaxial press and cold isostatic press. We investigated the effect of AN concentration on bioactivity. We fabricated composite of PLA and AN configurating the shape by using 3D printer. The composite showed high bioactivity.

A Study of an Effect on Moisture from 3D Printer Filament Drying Processes

2021 ◽  
Vol 902 ◽  
pp. 101-106
Author(s):  
Khompee Limpadapun ◽  
Jenjira Sukmanee
Keyword(s):  
3D Printing ◽  
Polylactic Acid ◽  
3D Printer ◽  
Drying Process ◽  
Humid Air ◽  
Air Drying ◽  
Moisture Desorption ◽  
Manufacturing Problems

This study investigated characteristics of moisture desorption for polylactic acid (PLA) filaments. The filaments tend to absorb moisture from humid air, led to moisten filaments. The absorption of even small amounts of moisture by filaments during storage and/or 3D printing, degraded the quality of final parts, and therefore, caused manufacturing problems. In this work, the filaments were subjected to humid conditions to achieve various moisture concentrations (0.75, 1.3 and 1.87 wt.%). Warm air-drying processes are used to reduce the moisture for different times (1, 2, 3, 4, 5 and 6 hours) and temperature (40, 50 and 60 °C). It was founded that the moisture from the polylactic acid (PLA) filaments can be discovered the moisture by use 60 degree of temperature in 5 hours warm air-drying process.

Emissions from the fused filament fabrication 3D printing with lignocellulose/polylactic acid filament

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 7560-7572
Author(s):  
Qianqian Zhu ◽  
Qian Yao ◽  
Jun Liu ◽  
Jianzhong Sun ◽  
Qianqian Wang
Keyword(s):  
3D Printing ◽  
Polylactic Acid ◽  
Test Chamber ◽  
Atmospheric Particulate Matter ◽  
Gas Chromatography Mass Spectrometry ◽  
Heating Process ◽  
3D Printer ◽  
Fused Filament Fabrication ◽  
Pyrolysis Gas ◽  
Vocs Emission

The application of Fused Filament Fabrication (FFF) 3D printing for offices, educational institutions, and small prototyping businesses has recently attracted increased attention. Thermal-fused filaments could emit potentially hazardous atmospheric particulate matter (PM) and volatile organic compounds (VOCs). This study evaluated the particle and VOCs emission characteristics of an FFF 3D printer with lignocellulose/polylactic acid (PLA) filament to reduce emissions. The PM2.5, PM0.2-10, and VOCs emission behaviors of the FFF 3D printer with a lignocellulose/PLA filament were investigated in a test chamber under different printing conditions. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) was applied to analyze the formation of VOCs from lignocellulose/PLA filaments. Analysis indicated that particle formation dominated the heating process, whereas VOCs were mainly released during the printing process. The results further showed that printing at higher relative humidity and high filament feeding temperatures triggered higher VOCs emissions. In addition, high humidity facilitated particle agglomeration and reduced PM concentration. Printing at higher filament feeding temperatures also resulted in high particle emissions. Finally, Py-GC/MS analysis determined the decomposition products of the lignocellulose/PLA filament corresponding to the main ingredients of VOCs.

scholarly journals Developing a Prosthesis Design using A Gearbox to Replicate the Human Hand Mechanism

2020 ◽  
Vol 16 (2) ◽  
pp. 24-33
Author(s):  
Haneen Mahdi Jaber ◽  
Muhammed Abdul -Sattar ◽  
Nabel Kadhim Abd al-Sahib
Keyword(s):  
Polylactic Acid ◽  
Upper Limb ◽  
High Power ◽  
Manufacturing Process ◽  
Degrees Of Freedom ◽  
Gear Ratio ◽  
Human Hand ◽  
3D Printer ◽  
Research Activities ◽  
Artificial Hand

Prosthetic is an artificial tool that replaces a member of the human frame that is  absent because of ailment, damage, or distortion. The current research activities in Iraq draw interest to the upper limb discipline because of the growth in the number  of amputees. Thus, it becomes necessary to increase researches in this subject to help in reducing the struggling patients.  This paper describes the design and development of a prosthesis for people able and wear them from persons who have amputation in the hands. This design is composed of a hand with five fingers moving by means of a gearbox ism mechanism. The design of this artificial hand has 5 degrees of freedom. This artificial hand works based on the principle of  under actuated system. The used motor is 6V Polulu high-power carbon brush micro metal gearmotor with gear ratio equal to 50:1. The motor was chosen due to its compactness and cheapness. The hand manufacturing process was done using  a 3D printer and using polylactic acid material. Numbers of experiments were accomplished using the designed hand for gripping objects. Initially, the electromyography signal (EMG) was recorded when the muscle contracted in one second, two seconds, three seconds. The synthetic hand was able to produce a range of gestures and grasping for objects.

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