I had a crown placed on a back molar on July 5th, 2011. I was told it was a ceramic crown, with glass Ionimic cement with something called Metho Metholonate in the glue or cement. I have experienced hives in the warmest places of my body, every night, during sleep. I wake up at 5 am covered with large itchy welts that are even on my face and head. I was told there was no metal in the ceramic cap placed on my tooth. I was given a shot in the tooth area, and was awake during the process. Is it possible that I am still allergic to some of this anesthetic, or that there is some kind of alloy in the ceramic that is triggering these hives. I am at wit’s end. I haven’t got a food allergy, nor clothes soap etc. All have been tried and I still have these. Can you shed some light on the possible cause of these hives? I am taking two 25 mg. tablets of Hydroxyzine Hcl per night, and still experience the hives. Thanks you for your kind consideration.