Corrosion implants

Temperature is an important factor influencing in vivo electrochemical behavior. Internal body temperature is homeo-statically regulated at 37 C, so it is important to test at this value in the laboratory. For dental materials exposed to the oral cavity, the temperature fluctuates due to food cind drink intake and can range from about 0-70°C. Dissolved salts, particularly chlorides, are probably the most influential components for implant corrosion in vivo [2], although by no means the only ones. The internal body electrolyte has the equivalent of 0.9 % NaCl in solution. 

Kruger, J., Fundamental Aspects of the Corrosion of Metallic Implants, Corrosion and Degradation of Implant Materials, ASTM STP 684, B. C. Syrrett and A. Achaiya, Eds., ASTM International, West Conshohocken, PA, 1979, pp. 107-127. 

Hahn, H., Lare, P. J., Rowe, R. H., et al., Mechanical Properties and Structure of Ti-6A1-4V with Graded-Porosity Coatings Applied by Spraying for Use in Orthopaedic Implants," Corrosion and Degradation of Implants Second Symposium, ASTM STP 859, A. Fraker and C. Griffin, Eds, ASTM International, West Conshohocken, PA, 1985, pp. 179-191. 

K.A. Thomas, S.D. Cook, A.F. Harding, and R.J. Haddad Jr., Tissue reaction to implant, corrosion in 38 internal fixation devices. Orthopedics, 11, 441-451 (1988). 

Corrosion is the unwanted chemical reaction of a metal with its environment, resulting in its continued degradation to oxides, hydroxides, or other compounds. Tissue fluid in the human body contains water, dissolved oxygen, proteins, and various ions such as chloride and hydroxide. As a result, the human body presents a very aggressive environment for metals used for implantation. Corrosion resistance of a metallic implant material is consequently an important aspect of its biocompatibility. 

SVC (simultaneous ventilation and chest compression) CPR, 18-7 Craik,K.J.W.,77-3 Creasey, G., 33-4 Crevice corrosion in, metallic implants corrosion, 38-17-38-18... 

Metallic corrosion, in dental implants, 45-32 Metallic implants corrosion, 38-13-38-18... 

Local gas cavity formation accompanying Mg implant corrosion... 

A common observation from in vivo experiments in biodegradable Mg research is the local formation of gas cavities which accompanies the implant corrosion. However, there are contradictory reports on the occurrence of gas cavities subcntaneously while intravasal application showed no local gas accumulation. An explanation for this observation might be based on the diffusion and solnbility coefficient of hydrogen in biological tissues which has been widely reviewed (Lango et al, 1996). The solubility of hydrogen... 

Ohnedo, D. G., Duffo, G., Cabrini, R. L. and Gughehnotti, M. B. (2008), Local effect of titanium implant corrosion an experimental study in rats . International Journal of Oral and Maxillofacial Surgery, 37, 1032-8. 

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