engleski

Rotational Growth in Late Lower Arch Crowding

AIM: Late lower arch crowding is a problem frequently encountered in orthodontic practice. There is a strong tendency for the untreated lower arch to become more crowded in the post-adolescence period. The cause of this late increase in crowding is obscured by its multifactorial nature. The controversy about the aetiology of late lower arch crowding has not yet been satisfactorily resolved. Skeletal structure and complex growth pattern have been implicated in the cause (occurrence) of late lower arch crowding. The aim of this study was to examine the rotational growth pattern in two groups of subjects, with and without lower anterior crowding. SUBJECTS AND METHODS: One hundred and thirty subjects with lower arch crowding were compared with a group of 90 subjects without crowding. Twelve angular and six linear vertical cephalometric variables were evaluated. RESULTS: With the exception of the vertical position of the maxilla, all the observed cephalometric variables showed significant posterior rotational growth in the group with crowding. In addition, a significant correlation was found between posterior mandibular rotational growth and crowding. CONCLUSIONS: A post-rotational growth pattern is an important characteristic of late lower arch crowding

mandible; growth; crowding

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