Presented at the biennial meeting of the Angle Society, Boca Raton, 1973.

Portions of this research were funded by the Pacific Coast Society of Orthodontists and presented in part at the 51st General Meeting, International Association for Dental Research, Washington, D.C.

*This research at the University of Chicago was made possible by a grant from the Kenilworth Dental Research Foundation.

Presented at the January, 1974 meeting of the North Atlantic Component of the Angle Society.

Given at the January, 1972 meeting of the North Atlantic Component of the Angle Society.

This investigation was supported in part by P.H.S. Research Grant DE-00853, National Institute of Dental Research.

From The Department of Orthodontics, University of Oslo, Oslo, Norway.