Abstract
A total of 1159 children (612 girls and 547 boys) aged 11-12 yr were examined to determine the range and mean overjet values in 4 defined upper lip-maxillary central incisor relationships. No clinically significant differences were found on comparison of the data relative to each upper lip position. Upper lip posture is adaptive to the maxillary central incisor angulation and the upper lip musculature is unlikely to influence the development of the incisor occlusion.

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