The comparative study of craniofacial structural characteristic of individuals with different types of cleft palate.

To compare craniofacial structural characteristic of individuals with different types of cleft palate and to lay a foundation for better treatment protocol for patients with cleft palate, we chose a sample consisting of 12 patients with Treacher Collin syndrome, 15 patients with Pierre Robin sequence, 40 patients with unilateral complete cleft lip and palate, and 40 patients with isolated cleft palate who met certain criteria. Lateral cephalometric radiographs were obtained from each subject. A total of 22 variables, comprising 11 angular, 9 linear, and 2 ratio measurements, were studied. The z-scores were analyzed during paired Student t test. The data showed us that there seems to be no difference in craniofacial structures between patients with isolated cleft palate and normal persons. Patients with unilateral complete cleft lip and palate who had only cleft lip repaired exhibit such characteristics as midface retrusion, relatively excessive lower facial height, and more obtuse gonial angle. The cranial base areas of individuals with Treacher Collin syndrome and Pierre Robin sequence are similar to those of normal persons. Mandibular hypoplasia in both vertical and horizontal dimensions and maxillary retrusion can be found in patients with Treacher Collin syndrome, while only mandibular hypoplasia in the horizontal dimension can be found in patients with Pierre Robin sequence. The developmental deficiency of craniofacial structures seems to be a separate deformity, not the direct outcome of cleft palate defect.