Craniofacial development in children with unilateral clefts of the lip, alveolus, and palate treated according to four different regimes. II. Mandibular and vertical development.

Lateral skull radiographs of 85 patients with unilateral clefts of the lip, alveolus and palate treated according to four different regimes were compared longitudinally, at three different ages, regarding mandibular and vertical facial development. It was found that there were no lasting differences in mandibular morphology resulting from regimes including primary or early secondary bone grafting. The non grafted group, however, showed increased mandibular length and anterior height. The jaw angle was increased and there was a more favourable sagittal jaw relationship. Regimes that included primary bone grafting were associated with reduced upper anterior facial height, which resulted in less harmonious facial proportions compared with treatment regimes including early secondary bone grafting done during the mixed dentition, or no bone grafting at all. Vertical development was greatest where bone grafting was excluded.