Bite Impression For Upper Denture.

Hi, I need to know if the position of your lower jaw is relevant when the impressions are taken for an upper denture in regards to ones bite. I have TMJ. With my lower jaw relaxed I am able to chew however I have locking and clicking and pain. When I purposefully extend my jaw outward, closer to the position it should be in, a lot of my TMJ symptoms are eased. I wore a splint for many years but was unable to further my TMJ treatment due to loss of insurance. Wearing the splint enabled me to know approximately where my bite should be. My lower jaw will not stay in this position without conscious effort. Before my upper front teeth were removed I could keep that position by having my lower teeth catch on my upper front teeth. I explained all of this to the dentist beforehand and asked where I should position my lower jaw while the impressions were made. I was told in my normal position. I answered that I did not have a normal but her answer did not change so I chose to place my jaw forward to where my bite should be. During the try on phase of the wax dentures, I was not in agreement with the appearance or fit of the upper denture unless I would thrust out my lower jaw as I did while the impressions were made. The dentist attempted to make some adjustments then said she could not. I felt talked into accepting it as being correct. I am concerned the denture will not be correct and will inhibit my ability to chew and will give me an awkward appearance. I realize I may be wrong and it may not matter where my lower jaw was sitting when the impression was taken. Or that the difference would be so small it can be corrected by tweaking the final denture. If it does matter than I feel like we should start over. Before paying $3000.00 and removing the last of my upper natural teeth I would appreciate some advice. Thank you very much, Sherri Cameron.