ISSN:
0003-276X
Keywords:
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Medicine
Notes:
Lateral cephalometric radiographs of 353 young caucasoid orthodontic patients from 6 years to 17 years were examined for the presence of ponticulus posticus of the first cervical vertebra. Visualization of the posterior fossa was not obstructed and in each case the squamous occipital and posterior arch of the atlas could be clearly defined. Of the 353 subjects, 56 (15.8%) showed some degree of a ponticulus posticus. Of these, 24 (14.6%) of 164 were males and 32 (16.9%) of 189 were females, with no apparent sex differences in the occurrence of this anomaly. Those showing a ponticulus were divided on the basis of bilateral complete or incomplete and unilateral complete or incomplete. There were numerous variations in the size and location of the ossification centers in the atlanto-occipital membrane. The youngest female with a ponticulus was six years seven months and the oldest 16 years 11 months, while the youngest male was six years four months and the oldest 16 years five months. Two females with a unilateral partial ponticulus were observed over a one to two year period. During this time a complete unilateral radiopaque ponticulus had developed.
Additional Material:
2 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/ar.1091450308
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