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Friday, August 12 • 1:50pm - 2:30pm
Pre-and Post-natal Retrognathia in Homo sapiens: An Evolutionary Perspective on a Modern, and Serious, Pediatric Health Problem

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From an optimal evolutionary fitness perspective, the healthiest phenotype for the anatomically modern human (AMH) facial profile is prognathic for both the mandible and maxilla (i.e., maxilla and mandible both forward of the anterior cranial base). According to archived crania and mandibular specimens from museums worldwide, maxillo-mandibular prognathism (M-MP) had indeed been ubiquitous over the 200,000+ years of AMH's evolutionary history until around the time of the Industrial Revolution in the early 19th-Century when retro-gnathic profiles first became evident in the UK, western and northern Europe and North America . There are a few reasonable hypotheses for explaining this relatively sudden departure from AMH's healthy M-MP profile phenotype that are mostly predicated upon feeding strategy changes normally normally associated with transitioning of cultures from traditional Hunter-Gatherers to other forms of sustenance known to be associated with increased intensification of food processing (e.g., agrarian and/or industrialization). These hypotheses, with emphasis placed upon early infancy and childhood nursing and weaning patterns, will be developed in this discussion based largely upon evidence gathered from the Morton Crania Collection at the University of Pennsylvania's Museum of Archaeology and Anthropology where the author is a Visiting Scholar; and implications for how these data support speculation that current orthodontic diagnosis, treatment and success criteria standards, are in need of revision will also be discussed.

avatar for Kevin Boyd

Kevin Boyd

DDS, Dentistry for Children
Kevin Boyd is a Chicago Pediatric Dentist. He teaches in the residency program in Pediatric Dentistry at Lurie Children’s Hospital; he also serves as dental consultant to Lurie’s Sleep Medicine service. He is currently a Visiting Scholar at U. Pennsylvania doing research in the... Read More →

Friday August 12, 2016 1:50pm - 2:30pm MDT