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September 4, 1943

Principles of Orthodontics

JAMA. 1943;123(1):64. doi:10.1001/jama.1943.02840360066033

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To the orthodontist this book is disappointing as so little space is devoted to the science and practice of orthodontia and so much to preliminary topics of growth and development of bone, muscle, dentition and tooth eruption. Endocrine function and dysfunction, nutrition and diet have a relationship to dentofacial deformities, though they may be hereditary, environmental or acquired through illness and sometimes accentuated through habits.

Classification and diagnosis of dentofacial anomalies are determined according to different standards. Angle, Simon and Hellman reach their conclusions, determining the deviations from the normal standard, by different methods, which are described in detail. Pont has compiled a table of arch widths based on teeth widths. Thus by the use of the Pont normal tooth index the approximate amount of change required in the arch may be mathematically computed.

In addition to corrective orthodontic appliances, exercises are often prescribed to aid muscular development in forming

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