Objectives: To identify the soft tissue chin position relative to the upper part of the face wherein the Frankfort horizontal (FH) plane intersects the nasal bridge and to define a specific measurement that might benefit different racial groups and their treatment goals. Materials and Methods: Forty-eight Taiwanese adults (23 males and 25 females), selected based on criteria consisting of proper occlusion, skeletal Class I pattern, lip competence in repose, and within the Esthetic (E) line confined standard, were subjected to standard soft tissue facial analyses. The results were used to compare with those of the White norm. Results: Analyses revealed that the means of the nose of our sample were shorter than those of the White, but those of the upper lip and chin were thicker. Despite the measured counter or unfavorable differences, all samples still abide E line criteria, suggesting that chin position in mandible must justify the harmonious facial profile. Moreover, a facial angle was constructed between the FH plane and a profile line drawn from a point where the FH plane meets the nasal outline tangentially to soft-tissue chin. A consistent value of 84 degrees was obtained in both male and female. Conclusion: The measurement of the profile angle can identify and localize the chin point. Even though the length of the nose and the thickness of the lips and chin may vary, the proper chin position may eventually justify a pleasing facial profile among different ethnic origins.
Chen, Hui-Ling; Lee, Yueh-Tse; and Wang, Yu-Ching
"Profile Angle Defines Soft Tissue Chin Position in Adults,"
Taiwanese Journal of Orthodontics: Vol. 26:
1, Article 1.
https://doi.org/10.30036/TJO.201403_26(1).0001 Available at: https://www.tjo.org.tw/tjo/vol26/iss1/1
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