Re: Fixed Bridge disappointment.
Didn't your dentist try it in before he/she permanently cemented it? You should have had some time to "try it out" before it was permanently cemented in. Was an impression of your old bridge used for the new one? If so, what reason does your dentist give you for them to be so much different in size and shape?
Maybe it would help if you wrote all your concerns down (a copy of your letter is a good start) and then take them back to your dentist. Most dentists want you to be happy and your dentist should.
If you are not happy, he/she is whom you need to speak with about it.
Good luck. You need to go back to whomever made the bridge and voice your concerns.
Remember you paid good money for a new bridge and it should be to YOUR satisfaction.
My very best to you,