A study on citric acid as a proposed replacement resorption inhibitor.

The material consisted of 36 one-rooted immature teeth in 6 mongrel dogs. 12 teeth were immediately replanted after extraction, while 24 teeth were extracted and stored dry for 120 min before re- or autotransplantation. Root planing and topical citric acid treatment of the root of dry-stored teeth did not prevent the development of progressive root resorption and ankylosis, not even when special care was taken to prevent damage to the superficial, demineralized layer of the root during and after the transplantation procedures in an experimental model, which included autotransplantation of teeth to sockets, which were much larger than their original sockets.