Measurement of crown width of the teeth from first molar to first molar in population samples from Northern Mexico and North Central United States finds only small differences that would be of little importance in orthodontic diagnosis.

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Author notes

Dr. Bishara is Professor of Orthodontics at the University of Iowa in Iowa City. He is a dental graduate (D.D.S.) of the University of Iowa, and also holds a D. Orth. from the University of Alexandria in Egypt and an M.S. in Orthodontics from the University of Iowa. He is a Diplomate of the American Board of Orthodontics

Dr. Garcia is in the private practice of orthodontics in Chihuahua, Mexico. He is a dental graduate (C.D.) of the University of Chihuahua, and an orthodontic graduate (M.S.) of the University of Iowa

Julie Fahl is an Engineering graduate (B.S.) of the University of Iowa, and is currently a dental student at the University of Nebraska

Jane Jacobsen is a Biostatistician in the Department of Preventive and Community Dentistry at the University of Iowa. She holds an M.A. degree in Biostatistics from the university of Iowa