I certainly feel its linked to the RCT, however it seems to depend on how expert your surgeon is, how much time it took and how much jaw opening was requested. On my first Third Molar Extraction (and RCT of 2nd Molar) on the left side which was about 6 years ago, I had no issues but after the right sight Third Molar extraction and RCT , about 4 years ago the surgeon was less experienced, it was prolonged over 2 hours of jaw stretched and traumatic too. And about 6 months from then I had Tinnitus. The T is noticably higher in my right ear. An extra jaw opening escalates the pitch of noise. It has some direct relation to jaw opening and jaw bones.
Researchers please contact me if you need any further info.