Head posture and malocclusions

The present study aimed to examine whether any pattern of associations coul d be found between the posture of the head and neck, and the occurrence of malocclusions. The sample comprised 96 children (45 M, 51 F) aged 7-13 year s, sequentially admitted for orthodontic treatment of severe malocclusions. Malocclusions were diagnosed clinically and classified into occlusal, spac ing, and dentitional anomalies and their subdivisions. Craniovertical, cran iocervical, and cervicohorizontal postural variables were recorded from lat eral cephalometric radiographs taken with the subject standing with the hea d in the natural head position (mirror position). A clear pattern of associations between crowding and craniocervical posture was found, Subjects with anterior crowding, i.e, more than 2 mm lack of sp ace in the upper or lower anterior segments of the dental arch, had cranioc ervical angles that were on average 3-5 degrees larger than subjects withou t crowding (P < 0.05, P < 0.01). The findings were in agreement with the so ft tissue stretching hypothesis, according to which the sagittal developmen t of the dentoalveolar arches is impeded by the increased dorsally-directed soft tissue pressure in subjects with extended craniocervical posture.