Abstract
A partial deletion of the short arms No.10 chromosome (10 p-syndrome)is described in a 4-year and 6-month-old boy with gross abnormalities involving several organ systems. Chromosomal analysis revealed an abnormal clone of cells with a 47 XXY, del (10) (P14→Pter)/47 XXY mosaic karyotype. He had mental and physical growth retardation, heart trouble, encephalatrophy, ventricular magnification, antimongoloid slant, inner epicanthal fold, saddle nose, earlobe bombe and talipes varus. In addition to these general findings, this case also disclosed the following dental findings:
1) The form of the palate was assymmetrical and the median palatine suture was slightly shifted to the left.
2) The enlargement of the ramus angle and a finger sucking habit led to an open bite.
3) Each of the mesiodistal lengths of all primary teeth was larger than their normal value.
4) The basal tubercle of the lower primary canines deviated to distal direction, and the marginal ridges of the upper first and second primary incisors and first primary molars were particularly large, and the upper primary in cisors were shovel shaped teeth.
5) Roentgenogram revealed missing tooth germs of the upper second permanent incisors.
