Manufacturing Presentation

In addihon most of scaolds that are used in hssue

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Unformatted text preview: 3- DIMENSIONAL PRINTING a RP TECHNIQUE cont’d A study was carried out by Hermann Seitz et al to invesHgate the capabiliHes of a ceramic- based process chain for the fabricaHon of porous scaffolds for bone Hssue engineering using hydroxyapaHte [10]. The process started with a 3D dataset that is sliced by a computer to generate the prinHng matrix of each layer [10]. 3- DIMENSIONAL PRINTING a RP TECHNIQUE cont’d [1] 3- DIMENSIONAL PRINTING a RP TECHNIQUE cont’d The SEM scan above of a cross- secHon of a sintered material (channel test part) shows the pore structure of the bulk material [10]. The pores are in a range between 10 and 30 microns [10]. This demonstrates the parHcles had a good connecHon through sintering [10]. 3- DIMENSIONAL PRINTING a RP TECHNIQUE cont’d For good osteointegraHon, a mean pore diameter of 565 microns of inner channels in a scaffold is discussed [10]. The channel resoluHon of the cylindrical test structure with internal channels ranged between 450 and 570 microns, and thus is close to the opHmum channel size [10]. FUSED DEPOSITION MODELING a RP TECHNIQUE The fused deposiHon modeling method forms three- dimensional objects from computer generated solid or surface models like in a typical RP process [3]. In comparison with the three- dimensional prinHng method, the fused deposiHon modeling method does not require any solvent and offers ease and flexibility in material handling and processing [3]. FDM uses a small temperature controlled extruder to force out a thermoplasHc filament material and deposit the semi- molten polymer onto a playorm in a layer- by- layer process [3]. FUSED DEPOSITION MODELING a RP TECHNIQUE cont’d [1] FUSED DEPOSITION MODELING a RP TECHNIQUE cont’d An arHcle by Samar JyoH Kalita et al reported on the fabricaHon of porous PP- TCP composite scaffolds using the fused deposiHon modeling process [48]. The models were designed with variable FDM pa...
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This note was uploaded on 01/14/2014 for the course MECH 810 taught by Professor Various during the Fall '13 term at Queens University.

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