As I have reiterated on a number of past posts, the best way to handle things like this is one on one with your dentist. These types of things do happen, and it should be the good relationship you have with him/her that will allow you to come to an amicable solution.
Although I am not an attorney, it is my understanding that you would have to prove that your dentist deviated from the normal practice of dentistry
. This might prove difficult if there were no outward symptoms or definitive evidence on your radiographs. I know you are looking for some sort of guarantee, but unfortunately there is no medical procedure that can be guaranteed fool proof and problem free.
You allowed your dentist to fabricate your bridge because you had faith in him. Have faith that he did do everything correctly, and this is just one of those things that happen. Work something out with that in mind and don't try to cast
blame where none may exist.