Bridge replaced and cannot get bite adjusted

I had a bridge replaced in fall of 2009.  During a routine dental cleaning and xrays, dentist advised a possible root canal was needed.  I had no problems indicating this but took his advice.  He removed a 3 tooth bridge on upper.  When he replaced the bridge, I have had bite and pain problems for a year now.  I have been back numerous times to get bite adjustments.  None of these adjustments worked.  In the meantime, several other teeth and crowns were filed and had to replace a crown on lower because of pressure and adjustments from the new bridge on upper.  Still having problems.  Dentist has just removed this new bridge and has replaced with another bridge.  Still having bite and pain problems.  Still no root canal needed.  Dentist has taken several more xrays to see how roots are doing.  He is frustrated with me and I am with him.  What should I do?  The more he does, the worse the situation becomes.

[scottma]

Seeing a prosthodontis or occlusionist is advised.