The predictability of dentoskeletal factors for soft-tissue chin strain during lip closure

Yun Hee Yu, Yae Jin Kim, Dong Yul Lee, Yong Kyu Lim

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Objective: To investigate the dentoskeletal factors which may predict soft-tissue chin strain during lip closure. Methods: The pretreatment frontal and lateral facial photographs and lateral cephalograms of 209 women (aged 18-30 years) with Angle's Class I or II malocclusion were examined. The subjects were categorized by three examiners into the no-strain and strain groups according to the soft-tissue chin tension or deformation during lip closure. Relationships of the cephalometric measurements with the group classification were analyzed by logistic regression analysis, and a classification and regression tree (CART) model was used to define the predictive variables for the group classification. Results: The lower the value of the overbite depth indicator (ODI) and the higher the values of upper incisor to Nasion-Pogonion (U1-NPog, mm), overjet, and upper incisor to upper lip (U1-upper lip, mm), the more likely was the subject to be classified into the strain group. The CART showed that U1-NPog was the most prominent predictor of soft-tissue chin strain (cut-off value of 14.2 mm), followed by overjet. Conclusions: To minimize strain of the soft-tissue chin, orthodontic treatment should be oriented toward increasing the ODI value while decreasing the U1-NPog, overjet, and U1 upper lip values.

Original languageEnglish
Pages (from-to)279-287
Number of pages9
JournalKorean Journal of Orthodontics
Issue number6
Publication statusPublished - 2013 Dec
Externally publishedYes


  • Classification and regression tree
  • Mentalis
  • Soft-tissue chin

ASJC Scopus subject areas

  • Orthodontics


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