About alternative magnetic effect on porcelain (for induction furnace purposes)
On reason you don't see much information is that your plan will not work. The copper wire will get hot by resistance and conduction and at some temperature it will react with the refractory = fail. Copper has essentially no use as a heating element because the oxide spalls off after each heat cycle. Use Nichrome wire ( this alloy family has a few different names ). However , as I understand induction heating it needs an conductive target. I am guessing your dental porcelain has poor electric conductivity , so will not heat by induction.