Influence Of Recasting Palladium-sliver Alloy On Compositional Stability And Elemental Release Into A Corrosion Testing Medium

Casting procedures require use of more metal than is needed to produce a restoration. In many dental laboratories, the casting surplus alloy is commonly reused with the addition of new alloy to produce other castings when noble and semi-noble alloys are used. However, controversy has been associated with reuse of casting alloys, Some reports have been published that repeated casting may lead to some change in the composition and microstructure of the alloys, which effect a change in mechanical properties, metal-porcelain bonding strength and the corrosion performance. Corrosion of an alloy is of fundamental importance to its biocompatibility because the release of elements from the alloy is nearly always necessary for adverse biological response. The biological safety of Pd in dental alloys has been of some concern in recent years due to the release of palladium into the oral environment and sensitivity reactions in patients. There is no study to tell us whether the recasting procedure has an effect on elemental release of palladium alloy. The aim of this study is to evaluate the influence of recasting palladium-sliver alloy on elemental release into a corrosion testing medium. The elemental compositional stability of as-received and recast alloy also will...