Fig. 1.

a-c: Intraoral photos of a 21-year-old man with DS. Despite orthodontic treatment during childhood and following prosthetic rehabilitation one can detect a smaller maxilla and a broader mandibula leading to a lateral crossbite- and an open-bite-tendency. There is an aplasia of the teeth 15, 13, 12, 22, 45. Gingivitis with tendency toward bleeding and periodontal disease can be seen in the upper front