What is the role of minor elements like tin and indium, which oxidize easily, in a metal-ceramic crown used for a fixed partial denture (FPD)?

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Enhance the adhesion between metal and ceramicReduce the formation of poresInteract with the opaque porcelain layer that conceals the metalAdjust the thermal expansion compatibility between metal and porcelain

Explanation

Tin and indium, as minor oxidizable components in metal-ceramic crowns, primarily serve to improve the bond strength between the metal framework and the ceramic layer, ensuring better adhesion and durability.