Adjusting the Subsurface Properties of Biocompatible Magnesium–Calcium Alloys as Absorbable Implant Material by Machining Processes

Conference paper

Abstract

Traditional methods of osteosynthesis or osteotomy use permanent metal implants e.g. bone screws and bone plates made of steel or titanium alloys, but permanent metal implants have to be excised. Especially young patients in growth require the implant removal. Biodegradable implants, which dissolve in the human organism, therefore represent an appropriate solution. Biocompatible magnesium alloys offer great potential as absorbable implant materials. Providing sufficient mechanical properties they degrade within a certain time span after surgery and are therefore suitable to temporarily accomplish medical functions, for instance as bone screws or plates. These implants support fractured bones until healing. This paper describes approaches to adjust the corrosion of the magnesium and hereby the degradation kinetics of the implant in the organism. The degradation kinetics is adjustable via modifications of surface (e.g. topography) and subsurface properties (e.g. micro hardness, residual stresses) of the implant determined by the manufacturing process. Consequently, a specific degradation profile adapted to requirements of the individual medical application is achievable.

Keywords

Residual Stress Corrosion Rate Corrosion Behavior Compressive Residual Stress Hydrogen Generation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The investigations described in this paper were funded by the German Research Foundation (DFG) within the subproject R4 of the collaborative research center SFB 599 “Sustainable Bioresorbable and Permanent Implants of Metallic and Ceramic Materials”.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.PZH – Hannover Centre for Production Technology, IFW – Institute of Production Engineering and Machine ToolsLeibniz Universität HannoverGarbsenGermany

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