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KMID : 0361920160460020081
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Korean Journal of Orthodontics
2016 Volume.46 No. 2 p.81 ~ p.86
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The influence of age on lip-line cant in adults:a cross-sectional study
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:Choi Sung-Hwan
:Kim Jung-Suk/:Kim Cheol-Soon/:Hwang Chung-Ju
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Abstract
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Objective: The aims of this study were to assess the direction and degree of lip-line cant in Korean adult orthodontic patients and to identify the effects of sex and age on changes in the cant severity.
Methods: In this cross-sectional retrospective study, lip-line cant was measured in the frontal photographs of 585 Korean patients (92 men and 493 women) aged 18?48 years. The outcome variables (direction and degree of lip-line cant) were assessed in terms of predictor variables (sex, age, sagittal skeletal relationship, and menton deviation angle).
Results: The direction of lip-line cant did not differ according to sex, age, or skeletal classification. Patients had 1.6o of lip-line cant on average before orthodontic treatment. Middle-aged adults displayed a significant trend toward a lower degree of lip-line cant compared to younger adults (p < 0.01). Multiple linear regression analysis showed that the degree of lip-line cant was weakly negatively correlated with age (p < 0.001).
Conclusions: While the direction of lip-line cant did not differ according to the parameters explored here, the degree of cant was correlated with age in adults, independent of menton deviation.Specifically, middle-aged adults tended to display significantly lower degrees of lip-line cant than did younger adults.
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KEYWORD
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Adults, Age, Lip-line cant, Menton deviation
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