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

  • Journal of the Korean academy of pediatric dentistry
  • Abbr : J Korean Acad Pediatr Dent
  • 2018, 45(1), pp.21-31
  • DOI : 10.5933/JKAPD.2018.45.1.21
  • Publisher : The Korean Academy Of Pediatric Dentistry
  • Research Area : Medicine and Pharmacy > Dentistry
  • Received : April 17, 2017
  • Accepted : July 26, 2017
  • Published : February 28, 2018

Sungdong Oh 1 Je-Woo Lee 2 Jinyoung Kim 1 Jiyoung Ra 2

1원광대학교 치과대학 소아치과학교실
2원광대학교

Accredited

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

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