Korean J Orthod.  2016 Mar;46(2):81-86. 10.4041/kjod.2016.46.2.81.

The influence of age on lip-line cant in adults: a cross-sectional study

Affiliations
  • 1Department of Orthodontics, Institute of Craniofacial Deformity, College of Dentisrty, Yonsei University, Seoul, Korea. hwang@yuhs.ac
  • 2Private Practice, Seongnam, Korea.

Abstract


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 1.6° 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.

Keyword

Adults; Age; Lip-line cant; Menton deviation

MeSH Terms

Adult*
Classification
Cross-Sectional Studies*
Humans
Linear Models
Male
Retrospective Studies

Figure

  • Figure 1 Measurement of lip-line cant using an image analyzer. Using the software, the degree of lip-line cant was evaluated by measuring the angles between the interpupillary line and the intercommissure line.

  • Figure 2 Posteroanterior cephalometric tracing and measurements. The menton deviation angle was measured as the angle formed by the anterior nasal spine-to-menton line and the midsagittal line (crista galli to anterior nasal spine).


Cited by  1 articles

Study on the perception of orthodontic treatment according to age: A questionnaire survey
Yoonji Kim
Korean J Orthod. 2017;47(4):215-221.    doi: 10.4041/kjod.2017.47.4.215.


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