Artificial bone scaffolds of coral imitation prepared by selective laser sintering

2020 ◽  
Vol 104 ◽  
pp. 103664 ◽  
Author(s):  
Yunsong Shi ◽  
Teng Pan ◽  
Wei Zhu ◽  
Chunze Yan ◽  
Zhidao Xia
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Artificial Bone ◽  
Bone Scaffolds

FABRICATION OPTIMIZATION OF NANOHYDROXYAPATITE ARTIFICIAL BONE SCAFFOLDS

NANO ◽  
2012 ◽  
Vol 07 (03) ◽  
pp. 1250015 ◽  
Author(s):  
CIJUN SHUAI ◽  
CHENGDE GAO ◽  
YI NIE ◽  
PENGJIAN LI ◽  
JINGYU ZHUANG ◽  
...  
Keyword(s):  
Laser Power ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Artificial Bone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bone Scaffolds ◽  
Optimum Parameters ◽  
Preheating Temperature ◽  
Ft Ir

Serious microcracks often occur on the surface of nanohydroxyapatite (n-HAP) artificial bone scaffolds prepared by selective laser sintering (SLS) technology. In this study, we found that appropriate preheating before sintering can reduce and attenuate the cracks. The microstructure and morphology of sintered n-HAP were tested at different preheating temperature and laser sintering speed with scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The experiments showed that the cracks gradually reduced and then disappeared when the preheating temperature increased from 0°C to 600°C while other parameters remain unchanged. The n-HAP particles gradually fused and grew up, while the grain size of sintered n-HAP will be attenuated with the increase of preheating temperature. As the thermal conductivity of n-HAP increases with increased preheating temperature, the temperature drops quickly, inhibiting greatly the grain growth of n-HAP. We obtained a group of optimum parameters when the sintered n-HAP still maintains nanostructure and possesses the optimal comprehensive performances, that is, laser power is 26 W, spot diameter is 4 mm, sintering speed is 200 mm/min, layer thickness is 0.4 mm, layer density is 852 kg/m3, and optimized preheating temperature is 600°C. These data illustrated that the cracks of sintered n-HAP can be eliminated at appropriate preheating temperature and sintering speed. This provided experimental optimal condition for the preparation of artificial bone scaffolds with nanohydroxyapatite ceramics.

Calcium sulfate bone scaffolds with controllable porous structure by selective laser sintering

2015 ◽  
Vol 22 (5) ◽  
pp. 1171-1178 ◽  
Author(s):  
Jianhua Zhou ◽  
Chengde Gao ◽  
Pei Feng ◽  
Tao Xiao ◽  
Cijun Shuai ◽  
...  
Keyword(s):  
Porous Structure ◽  
Calcium Sulfate ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Bone Scaffolds

Microsphere-based selective laser sintering for building macroporous bone scaffolds with controlled microstructure and excellent biocompatibility

2015 ◽  
Vol 135 ◽  
pp. 81-89 ◽  
Author(s):  
Yingying Du ◽  
Haoming Liu ◽  
Jiaqi Shuang ◽  
Jianglin Wang ◽  
Jun Ma ◽  
...  
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Bone Scaffolds

Revealing the compressive and flow properties of novel bone scaffold structure manufactured by selective laser sintering technique

2022 ◽  
pp. 095441192110704
Author(s):  
S Rashia Begum ◽  
M Saravana Kumar ◽  
M Vasumathi ◽  
Muhammad Umar Farooq ◽  
Catalin I Pruncu
Keyword(s):  
Selective Laser Sintering ◽  
Testing Machine ◽  
Laser Sintering ◽  
Maximum Pressure ◽  
Cfd Analysis ◽  
Bone Scaffold ◽  
Ansys Fluent ◽  
Bone Scaffolds ◽  
Novel Structure ◽  
Input Parameters

Additive manufacturing is revolutionizing the field of medical sciences through its key application in the development of bone scaffolds. During scaffold fabrication, achieving a good level of porosity for enhanced mechanical strength is very challenging. The bone scaffolds should hold both the porosity and load withstanding capacity. In this research, a novel structure was designed with the aim of the evaluation of flexible porosity. A CAD model was generated for the novel structure using specific input parameters, whereas the porosity was controlled by varying the input parameters. Poly Amide (PA 2200) material was used for the fabrication of bone scaffolds, which is a biocompatible material. To fabricate a novel structure for bone scaffolds, a Selective Laser Sintering machine (SLS) was used. The displacement under compression loads was observed using a Universal Testing Machine (UTM). In addition to this, numerical analysis of the components was also carried out. The compressive stiffness found through the analysis enables the verification of the load withstanding capacity of the specific bone scaffold model. The experimental porosity was compared with the theoretical porosity and showed almost 29% to 30% reductions when compared to the theoretical porosity. Structural analysis was carried out using ANSYS by changing the geometry. Computational Fluid Dynamics (CFD) analysis was carried out using ANSYS FLUENT to estimate the blood pressure and Wall Shear Stress (WSS). From the CFD analysis, maximum pressure of 1.799 Pa was observed. Though the porosity was less than 50%, there was not much variation of WSS. The achievement from this study endorses the great potential of the proposed models which can successfully be adapted for the required bone implant applications.

Fabrication of Bone Scaffolds Using Selective Laser Sintering

2013 ◽  
Vol 19 (5) ◽  
pp. 1345-1348
Author(s):  
Fwu-Hsing Liu ◽  
Sheng-Lih Yeh ◽  
Chil-Chyuan Kuo
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Bone Scaffolds

Control Software Development of a Novel Rapid Prototype Laser Sintering System for Fabricating Artificial Bone

2011 ◽  
Vol 88-89 ◽  
pp. 199-203
Author(s):  
Ci Jun Shuai ◽  
Yi Nie ◽  
Cheng De Gao ◽  
Huan Long Hu ◽  
Jing Yu Zhuang ◽  
...  
Keyword(s):  
Motion Control ◽  
Selective Laser Sintering ◽  
Three Dimensional ◽  
Rapid Prototype ◽  
Laser Sintering ◽  
Artificial Bone ◽  
Control Software ◽  
Control Card ◽  
Motion Control Card ◽  
Stability And Accuracy

An open motion control software for a novel selective laser sintering system has been developed to fabricate a three-dimensional porous artificial bone with complex shape. It adopts the library functions provided by a motion control card in Delphi 2006. It focuses on the realizations of control for ‘sintering a dot’, ‘sintering a line’ and ‘sintering a surface’ aiming at the characteristics of selective laser sintering. A problem that the transmission length of interpolation commands can not exceed certain value at a time due to constriction by the register capacity of the motion control card has been resolved. The control software has been successfully used in the experiment of laser sintering for fabricating artificial bone. The results show that the selective laser sintering system has high stability and accuracy.

Selective Laser Sintering of Biomaterials and Composites State of the Art and Perspectives

2020 ◽  
Vol 1012 ◽  
pp. 278-283
Author(s):  
Henrique Schappo ◽  
Lya Piaia ◽  
Dachamir Hotza ◽  
Gean Vitor Salmoria
Keyword(s):  
Review Paper ◽  
Complex Geometry ◽  
State Of The Art ◽  
Complex Structure ◽  
Selective Laser Sintering ◽  
Processing Parameters ◽  
Laser Sintering ◽  
Manufacturing Processes ◽  
Bone Scaffolds ◽  
Wide Range

Human bone has a complex geometry, varying its structure and composition. Additive manufacturing processes, such as selective laser sintering (SLS), can produce bone scaffolds with a wide range of biomaterials. Through SLS a complex structure with highly interconnected porous can be fabricated from a combination of materials. Composites made from biopolymers and bioceramics have shown promising results for bone regeneration, although some properties still must be enhanced. Finding suitable processing parameters is mandatory to achieve required final properties. This review paper is focused on polymer/ceramics using SLS machines in the last 10 years.

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