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KMID : 0358920180450010021
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Journal of the Korean Academy of Pedodontics
2018 Volume.45 No. 1 p.21 ~ p.31
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Correlation between the Inclinations of the Incisors and Lips in Mixed Dentition
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Oh Sung-Dong
Lee Je-Woo
Kim Jin-Young
Ra Ji-Young
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Abstract
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This study aimed to investigate the correlation between the inclinations of the incisors and lips in mixed dentition aged 7 - 11 years. Lateral cephalometric radiographs of 353 children were analyzed to measure the upper incisor inclination, lower incisor inclination, lower-nasolabial angle, and mentolabial angle in relation to the skeletal malocclusion classification. The measurements were then assessed using the Kruskal-Wallis test, Pearson correlation, and multiple regression analysis. There were significant negative correlations between the inclination of the upper incisors and lower-nasolabial angle in all classes of skeletal malocclusion. There was a negative correlation between the inclination of the lower incisors and mentolabial angle; however, class Ⅱ malocclusion had a significant positive correlation. This study identified the factors that affect lip inclination and verified their associations.
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KEYWORD
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Inclination of the incisors, Lower-nasolabial angle, Mentolabial angle
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