Abstract
In September 1992, the Australian Foundation for Orthodontic Research and Education held its biennial meeting at Hamilton Island, Queensland. The guest lecturer was Dr Patrick Turley. The first of Dr Turley’s presentations was the The Don Spring Memorial Oration, the content of which is included in the following article. The article has been reprinted with the permission of the Editor of the Pacific Coast Society of Orthodontists’ Bulletin. The second article will appear in the October 1993 edition of this Journal.