Closure of the spheno-occipital synchondrosis

Authors

  • Thomas V. Powell,

    1. Department of Orthodontics, Graduate College University of Illinois, Chicago, Illinois
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    • Abstract of a thesis submitted in partial fulfillment of the requirements for the Master of Science Degree, Graduate College, University of Illinois, 1962.

  • Allan G. Brodie

    1. Department of Orthodontics, Graduate College University of Illinois, Chicago, Illinois
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  • This study was supported in part by Research Grant D-1468, from the National Institute for Dental Research, U. S. Public Health Service.

Abstract

Comparative anatomical and histologic methods have been responsible for the belief that the spheno-occipital synchondrosis in the human is an active growth center until the adult stage is reached. According to standard texts the suture closes between the eighteenth and twenty-fifth years. The present investigation was a re-examination of this question by means of midsagittal laminagraphy. The material consisted of 205 males 8 to 21 years; and 193 females 6 to 18 years. The midsagittal lamina of the spheno-occipital junction appears as a band of less radiopacity when the suture is open. Closure was found to occur first on the cranial border and to progress downward. Initial closure was found in a male of 10 years, 10 months; first complete closure at 13 years, 4 months. The last found completely open was at 15 years, 2 months. Complete obliteration was found at 8 years, 1 month in one female subject and the last completely open suture at 13 years, 9 months. In general, the closing age for the males was between 13–16 years, and the female between 11–14 years.

Ancillary