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| August 2010 | Courtesy of BEGO USA |
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Look at the Chromium % When Choosing a NP Alloy When choosing a non precious alloy, several components need to be considered: CTE, oxide color, and ease of casting and finishing. Equally important is the chromium content - 20% or more chromium allows for passivation* to occur when the oxygen contacts the alloy surface. Passivation occurs when the chromium's transparent oxides form protective layers on the metal surface - stopping corrosion. These protective layers are like primer paint applied to bare metal to prevent corrosion. Corrosion allows nickel, zinc, indium, beryllium and gallium to surface and release -allowing these ions to be absorbed by the patient. It is important to note that BEGO's non-precious alloys contain no zinc, indium, beryllium, and gallium. Only Wiron Light and Wiron 99 contain nickel but the chromium content is over 20 % in each alloy. To limit the amount of ions coming to the surface - choose a NP alloy that has higher chromium giving the patient a more biocompatible solution. *Passivation is a process performed to make a surface passive, i.e., a surface film is created that causes the surface to lose its chemical reactivity. |
 Designing a mandibular partial framework
September 21, 201011:00AM EST Get answers to challenging questions technicians face when making lower partials both functional and aesthetic. $49/1 CDT Credit 
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 For more information, call your local dealer or BEGO USA, 1.800.342.2346 | www.begousa.com | |
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