From the September 26, 1911 Brooklyn Daily Eagle:

“Kalamazoo, Mich.–While pulling a tooth yesterday, Dr. Burr Bannister, one of the oldest dentists in Kalamazoo, was perhaps fatally injured. The patient turned to one side during the  operation and tipped the chair over, pinning the doctor beneath it. One of the arms of the chair struck the dentist in the stomach, causing an internal hemorrhage.”