[A study of sagittal jaw relationships in patients with Klinefelter's syndrome]

Lateral cephalometric radiographs were used to study sagittal jaw relationships in 22 cases with Klinefelter's syndrome. The following angles were measured: SNA, SNB and ANB. Depending on the size of SNA and SNB angles, all cases investigated were classified in the following groups: bimaxillary prognathism, bimaxillary orthognathism or retrognathism; maxillary prognathism combined with mandibular orthognathism; maxillary orthognathism combined with mandibular prognathism or retrognathism; maxillary retrognathism combined with mandibular prognathism, orthognathism, or retrognathism. The mean value of the ANB angle of the whole group was -0.20 degrees indicating the skeletal class III jaw relationship. Out of 22 cases investigated, 45.4% showed bimaxillary prognathism, and 27.3% had a combination of the maxillary orthognathism and mandibular prognathism. 27.3% of all cases investigated belonged to the remaining groups.