Biodegradable magnesium-calcium (Mg–Ca) implants have the ability to gradually dissolve and absorb into the human body after implantation. The similar mechanical properties to bone indicate that Mg–Ca is an ideal implant material to minimize the negative effects of stress shielding. Furthermore, using a biodegradable Mg–Ca implant prevents the need for a secondary removal surgery that commonly occurs with permanent metallic implants. The critical issue that hinders the application of Mg–Ca implants is the poor corrosion resistance to human body fluids. The corrosion process adversely affects bone ingrowth that is critical for recovery. Therefore, sequential laser shock peening (LSP) of a biodegradable Mg–Ca alloy was initiated to create a superior surface topography for improving implant performance. LSP is an innovative treatment to fabricate functional patterns on the surface of an implant. A patterned surface promotes bone ingrowth by providing a rough surface texture. Also, LSP imparts deep compressive residual stresses below the surface, which could potentially slow corrosion rates. Unique surface topographies were fabricated by changing the laser power and peening overlap ratio. The resultant effects on surface topography were investigated. Sequential peening at higher overlap ratios (75%) was found to reduce the tensile pileup region by over 40% as well as compress the overall surface by as much as .
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e-mail: yguo@eng.ua.edu
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March 2011
Research Papers
Fabrication and Characterization of Surface Texture for Bone Ingrowth by Sequential Laser Peening Biodegradable Orthopedic Magnesium-Calcium Implants
M. P. Sealy,
M. P. Sealy
Department of Mechanical Engineering,
The University of Alabama
, Tuscaloosa, AL 35487
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Y. B. Guo
Y. B. Guo
Department of Mechanical Engineering,
e-mail: yguo@eng.ua.edu
The University of Alabama
, Tuscaloosa, AL 35487
Search for other works by this author on:
M. P. Sealy
Department of Mechanical Engineering,
The University of Alabama
, Tuscaloosa, AL 35487
Y. B. Guo
Department of Mechanical Engineering,
The University of Alabama
, Tuscaloosa, AL 35487e-mail: yguo@eng.ua.edu
J. Med. Devices. Mar 2011, 5(1): 011003 (9 pages)
Published Online: February 3, 2011
Article history
Received:
August 5, 2010
Revised:
November 3, 2010
Online:
February 3, 2011
Published:
February 3, 2011
Citation
Sealy, M. P., and Guo, Y. B. (February 3, 2011). "Fabrication and Characterization of Surface Texture for Bone Ingrowth by Sequential Laser Peening Biodegradable Orthopedic Magnesium-Calcium Implants." ASME. J. Med. Devices. March 2011; 5(1): 011003. https://doi.org/10.1115/1.4003117
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