J Korean Acad Pediatr Dent.  2018 Feb;45(1):21-31. 10.5933/JKAPD.2018.45.1.21.

Correlation between the Inclinations of the Incisors and Lips in Mixed Dentition

• Oh S
• Lee J
• Kim J
• Ra J

• KMID: 2430312
• DOI: http://doi.org/10.5933/JKAPD.2018.45.1.21

Abstract

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 â…¡ malocclusion had a significant positive correlation. This study identified the factors that affect lip inclination and verified their associations.

Keyword

Inclination of the incisors; Lower-nasolabial angle; Mentolabial angle

MeSH Terms

Child
Classification
Dentition, Mixed*
Humans
Incisor*
Lip*
Malocclusion