My specific question....Can the Zirconium crowns be filed down and have composite veneer added over to just change the shape and color a bit? I am emotionally and physically drained from the hellish experience I've endured, and am just not ready to go through the process of getting new crowns all over again. Please, I just need something to tie me over for another year, until I can go through the process of getting different type of crowns. Advice please?