EFFECTS OF MANDIBULAR GROWTH-PATTERNS ON THE DEVELOPMENT AND CONFIGURATION OF THE FACE IN PATIENTS WITH UNILATERAL CLEFT-LIP AND PALATE

Radiographic cephalometry has been used for the assessment of the effe cts of mandibular rotation and of posterior growth displacement of the temporomandibular joint on the development of the face and on overjet in 43 patients with complete unilateral cleft lip and palate between the ages of 10 and 15 years. Rotation acted mainly on vertical facial measurements and on the position of the lower jaw. The degree of poste rior displacement of the temporomandibular joint exerted an influence on the position of the mandible, on the difference between the functio nal length of the upper and lower jaw, and on the occlusion of incisor s. The direction of growth of the mandible as a whole represented the result of a combination of changes produced by the rotation of the jaw and by the degree of posterior displacement of the temporomandibular joint. The most favourable conditions for development were a combinati on of the neutral type of rotation with a more pronounced posterior di splacement of the temporomandibular joint.