The analysis of an ontogenetic hypothesis relating the end point of midfacial growth to the development of the olfactory bulbs and cerebral hemispheres
Borovay, James Stewart
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This study was designed to examine an ontogenetic hypothesis, proposed by Dr. Donald Enlow, stating that the plane of the midface in the adult was predictably ninety degrees ([plus or minus] 2.5 degrees) to the plane of the olfactory bulbs regardless of the maxillo-mandibular relationship of the individual. The author based his theory on phylogenetic observations of over thirty mammalian species, and studied 147 human lateral headfilms consisting of class I, class II, and class II adults 15 years or older. The present study consisted of 51 lateral headfilms of adults with ages ranging from 17 years to 47 years. In addition to testing Enlow's angle, an original angle based on different cerebral structures was also investigated and both these angles were examined for relationships to skeletal measurements. The results tend not to support the original hypothesis in that a much greater range of variation (26 degrees) was documented for Enlow’s angle. The original angle showed a much smaller range (2.6 degress), while very low correlation coefficients were found for all significant relationships to skeletal measurements. In addition, the complex rationale behind the theory could not be totally supported by previous investigations.
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact firstname.lastname@example.org.Thesis (M.Sc.D.)--Boston University, School of Graduate Dentistry, 1974. Orthodontics.Bibliography included.
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