Can a dental assistant place my permanent crown?

If trained and certified, a Dental assistant can remove your temporary crown, clean up the prep tooth and try in the new crown. I dont believe in having assistants adjusting the bite on crowns as well, even though I know it is done all the time. 
Only the Dentist can place the final crown with cement and make the final adjustments, 

It is illegal and unethical for an assistant to place a new crown. If an old crown comes off an assistant can place it with temporary cement but not permanent cement.