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

Abstract

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.