| Autor: |
Pantawane MV; Department of Materials Science and Engineering, Laboratory for Laser Aided Additive and Subtractive Manufacturing, Virtual Center for Advanced Orthopedics, University of North Texas, Denton, USA., Chipper RT; Australian Institute of Robotics Orthopedics, Nedlands, Australia., Robertson WB; Department of Materials Science and Engineering, Laboratory for Laser Aided Additive and Subtractive Manufacturing, Virtual Center for Advanced Orthopedics, University of North Texas, Denton, USA.; Australian Institute of Robotics Orthopedics, Nedlands, Australia.; Department of Computing School of Electrical Engineering and Computing, Curtin University, Bentley, Australia., Khan RJK; Department of Materials Science and Engineering, Laboratory for Laser Aided Additive and Subtractive Manufacturing, Virtual Center for Advanced Orthopedics, University of North Texas, Denton, USA.; Australian Institute of Robotics Orthopedics, Nedlands, Australia.; Department of Computing School of Electrical Engineering and Computing, Curtin University, Bentley, Australia.; The Joint Studio, Hollywood Medical Centre, Nedlands, Australia., Fick DP; Department of Materials Science and Engineering, Laboratory for Laser Aided Additive and Subtractive Manufacturing, Virtual Center for Advanced Orthopedics, University of North Texas, Denton, USA.; Australian Institute of Robotics Orthopedics, Nedlands, Australia.; Department of Computing School of Electrical Engineering and Computing, Curtin University, Bentley, Australia.; The Joint Studio, Hollywood Medical Centre, Nedlands, Australia., Dahotre NB; Department of Materials Science and Engineering, Laboratory for Laser Aided Additive and Subtractive Manufacturing, Virtual Center for Advanced Orthopedics, University of North Texas, Denton, USA. narendra.dahotre@unt.edu. |
| Abstrakt: |
The extensive research on the laser machining of the bone has been, so far, restricted to drilling and cutting that is one- and two-dimensional machining, respectively. In addition, the surface morphology of the laser machined region has rarely been explored in detail. In view of this, the current work employed three-dimensional laser machining of human bone and reports the distinct surface morphology produced within a laser machined region of human bone. Three-dimensional laser machining was carried out using multiple partially overlapped pulses and laser tracks with a separation of 0.3 mm between the centers of consecutive laser tracks to remove a bulk volume of the bone. In this study, a diode-pumped pulse Er:YAG laser (λ = 2940 nm) was employed with continuously sprayed chilled water at the irradiation site. The resulting surface morphology evolved within the laser-machined region of the bone was evaluated using scanning electron microscopy, energy dispersive spectroscopy, and X-ray micro-computed tomography. The distinct surface morphology involved cellular/channeled scaffold structure characterized by interconnected pores surrounded by solid ridges, produced within a laser machined region of human structural bone. Underlying physical phenomena responsible for evolution of such morphology have been proposed and explained with the help of a thermokinetic model. |
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