Abstract
1147 children aged 11–12 years were examined to determine the mean overjet values relative to five defined postural lower lip/maxillary central incisor relationships.
A mean overjet of 3·025 mm was found in those children having a postural lower lip position related to the middle third of the maxillary central incisor; and those having no lower lip cover had a mean overjet of 4·26 mm. In contrast, the mean overjet value was 9·18 mm for those children having a “negative” lip position.
The observed differences between the mean overjet values relative to each lower lip position are statistically significant, but the only lower lip/maxillary central incisor relationship which appears to have any marked clinical significance is the one defined as—1 (i.e. the trapped lower lip).
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