Bad Smells in Crowns when I Press with my Tongue Bite or Suck my Saliva on my Teeth?

I change my old metal crown with a emax, since them i have problems with odor and flavor as each time I pressed or bite a liquid and tastes came and smells awful, these crowns I put in July 2012 and I almost every month a see this dentist because, my gum are healthy. My dentist decided to remove all and when they took the moldings came out one and smelled awful. Because this tooth She would't take the others .She want to see if that is causing the smell and taste, but i still have the same problem