[Maxillomandibular dysfunction (author's transl)].

After 7 years, mandibular growth is on the average over three times the deepening of the upper maxilla's. The exact superimposing of X-rays taken of the same child at different ages makes it possible to observe relationships varying widely from this average. The greatness of these individual variations is a supplementary proof in favour of the autonomy of mandibular growth with respect to that of the rest of the facial mass.