With Tinitus, there are so many possible causes and cures that it is beyond the scope of this website's purpose to go into all of that (for more in depth info go to Wikipedia.org). So, to give a brief effective summation of ringing in ears and how it relates to TMD is more appropriate.
Many medications, diseases, injuries, sicknesses, disorders can all be related to or cause ringing in ears. So basically if you have ringing in the ears, it could be caused by almost anything.
Now, when it is present, associated or accompanied with TMJ problems, there is an excellent chance that you can cure or eliminate the ringing and TMD problems, the ringing will go away...almost every single time! So, that's good news for you if you have ringing in ears, because TMJ pain is very treatable, which means most likely your ringing in ears will be gone as well.
But, you don't have to have TMJ symptoms for ringing in the ears to be caused by TMD causes. So, call your local TMJ Denist for TMJ Splint Therapy. It'll most likely eliminate your ringing in ears within a week or so. It works almost every single time with my patients