RADIOCEPHALOMETRIC EVALUATION OF A FAMILY WITH MANDIBULOFACIAL DYSOSTOSIS

Persons from four generations of a family with mandibulofacial dysosto sis (MFD), known as Treacher Collins (TC) Syndrome, were examined for the presence of clinical signs traditionally associated with this synd rome, In this family, 14 adults, who had been judged trait bearers by an earlier family study were included in this study, Maxillary and man dibular study models were taken of affected and unaffected family memb ers. Panoramic cephalograms and lateral radiographs were taken. The la teral cephalograms were traced and digitized on a computer system and compared, The 117 cephalometric values of the trait bearers were compa red with known standard values and nontrait bearing family members. In the trait bearing group, 81 of the 117 values and, in the nontrait be aring group, 72 of the 117 values were significantly different (p < 0. 05) when comparing mean values to the accepted normal range, The inter family comparison between trait-bearing and nontrait members revealed nine values to be significantly different, This indicates that cephalo metric analysis of these patients, some of whom have minimal clinical expression of the gene, may have potential value for screening and fur ther characterization of this condition. The results also suggest that intrafamily comparisons may be of greater value for diagnostic confir mation of TC than comparison with literature norms.