No Abstract Available.

These studies were in part supported by United States Public Health Service Grants D-720 and D-1252 and the Patterson-Hettinger Fund.

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Author notes

*Associate Professor and Chairman of Department, Graduate Orthodontics, University of Nebraska

**Associate Professor of Engineering Mechanics, lecturer, Graduate Department of Orthodontics, University of Nebraska

***From thesis submitted in partial fulfillment of requirements for the degree of Master of Science in Dentistry. University of Nebraska