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Quantitative and perceived visual changes of the nasolabial fold following orthodontic retraction of lip protrusion

 Eui Seon Baek  ;  Soonshin Hwang  ;  Yoon Jeong Choi  ;  Mi Ryung Roh  ;  Tung Nguyen  ;  Kyung-Ho Kim  ;  Chooryung J Chung 
 ANGLE ORTHODONTIST, Vol.88(4) : 465-473, 2018 
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CBCT ; Global Aesthetic Improvement Scale ; Lip protrusion ; Nasolabial fold ; Orthodontic retraction ; Soft tissue
OBJECTIVES: The objectives of this study were to evaluate the quantitative and perceived visual changes of the nasolabial fold (NLF) after maximum retraction in adults and to determine its contributing factors. MATERIALS AND METHODS: A total of 39 adult women's cone-beam computed tomography images were collected retrospectively and divided into the retraction group (age 26.9 +/- 8.80) that underwent maximum retraction following 4 premolar extraction and the control group (age 24.6 +/- 5.36) with minor changes of the incisors. Three-dimensional morphologic changes of hard and soft tissue including NLF were measured by pre- and posttreatment cone-beam computed tomography. In addition, perceived visual change of the NLF was monitored using the modified Global Aesthetic Improvement Scale. The influence of age, initial severity of NLF, and initial soft tissue thickness was evaluated. RESULTS: Anterior retraction induced significant changes of the facial soft tissue including the lips, perioral, and the NLF when compared with the controls ( P < .01). Perceived visual changes of the NLF was noted only in women younger than age 30 ( P < .05), with the odds ratio (95% confidence interval) of 2.44 (1.3461-4.4226), indicating greater possibility for improvement of NLF esthetics in young women of the retraction group when compared with the controls. CONCLUSIONS: Orthodontic retraction induced quantitative and perceived visual changes of the NLF. For adult women younger than age 30, the appearance of the NLF improved after maximum retraction despite the greater posterior change of the NLF.
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2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Dermatology (피부과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyung Ho(김경호) ORCID logo https://orcid.org/0000-0002-8154-2041
Roh, Mi Ryung(노미령) ORCID logo https://orcid.org/0000-0002-6285-2490
Chung, Chooryung J.(정주령) ORCID logo https://orcid.org/0000-0001-9399-7193
Choi, Yoon Jeong(최윤정) ORCID logo https://orcid.org/0000-0003-0781-8836
Hwang, Soon Shin(황순신) ORCID logo https://orcid.org/0000-0002-6472-4732
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