From the Department of Preventive Dental Science, University of Manitoba and the Department of Orthodontics, University of Illinois.

Presented at the 21st biennial meeting of the Edward H. Angle Society, October 8, 1975, Maui, Hawaii.

From the Eastman Dental Hospital and the London Medical College, London, England.

Read before the Northwest Component of the Angle Society, Portland, Oregon, January 1975.

From the Department of Orthodontics, Faculty of Dentistry, University of British Columbia.

This investigation was supported by NIH research grant number DE 02668 from the National Institute of Dental Research and by NIH grant number RR 05333 from the Division of Research Resources.

Presented at the November 1975 meeting of the Southern California Component of the Angle Society.

From the Departments of Graduate, Orthodontics and Anatomy, Univ. of Southern California Schools of Dentistry and Medicine.

Read before the Northern California Component of the Angle Society, 1975.

Read before the Southern California Component of the Edward H. Angle Society, 1975.