|
CORROSION RESISTANCE The corrosion resistance of an alloy is also a measure of biocompatibility. Materials that release ions of their constituents into a solution of body fluids may have toxic effects on the cells of that body. Argen alloys are subjected to the corrosion testing described in ISO-8891. Samples of alloy are cast into rectangular flags having a surface area of 2.4cm2 followed by polishing according to normal dental laboratory practice. The samples are then suspended in an aerated solution of 0.1 mol/l lactic acid at 37°C for seven days. The corrosion rate is determined by measuring the weight loss of the two samples divided by the area and expressed in mg/cm2. In addition to the weight loss measurements, the corrosion solutions were further analyzed for metal ion concentrations to determine the type and quantity of alloy constituents which became dissolved. For this purpose we used the services of a professional analytical laboratory with atomic absorption (AA) and inductively coupled plasma (ICP) capabilities. |
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
 |
|
|||||||||||
 |
 |
 |
|
|||||||||
 |
|
|||||||||||
 |
 |
|
||||||||||
 |
|
|||||||||||
 |
 |
|
||||||||||
 |
|
|||||||||||
 |
 |
|
||||||||||
 |
|
|||||||||||
 |
 |
 |
|
|||||||||
 |
|
|||||||||||
 |
 |
|
||||||||||
 |
|
|||||||||||
 |
 |
 |
|
|||||||||
 |
|
|||||||||||
 |
 |
|
||||||||||
 |
|
|||||||||||
 |
 |
|
||||||||||
 |
|
|||||||||||
 |
 |
|
||||||||||
 |
|
|||||||||||
 |
 |
|
||||||||||
 |
|
|||||||||||