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Sonographic Analysis of the Upper Labial Orbicularis Oris and Its Clinical Implications

Authors
 Hyun Jin Park 1  ;  Kyu-Lim Lee 1  ;  Young-Chun Gil 2  ;  Ji-Hyun Lee 3  ;  Kyung-Seok Hu 3  ;  Hee-Jin Kim 3 
Citation
 AESTHETIC SURGERY JOURNAL, Vol.40(7) : 778-783, 2020-06 
Journal Title
 AESTHETIC SURGERY JOURNAL 
ISSN
 1090-820X 
Issue Date
2020-06
Abstract
Background: Purse string lips, which include the vertical wrinkles over the lips, are frequently observed in aged individuals. Botulinum toxin and fillers are routinely injected into these areas to remove the wrinkles; however, the anatomy of the orbicularis oris muscle (OOr) near the vermilion border area has not been well defined. Objectives: The aim of this study was therefore to identify any morphological differences of the upper OOr via sonographic imaging. Methods: The upper lip muscles as observed utilizing an ultrasound device were divided into 2 muscles (pars peripheralis and pars marginalis) that were subsequently divided into a further 2 types (Type I and Type II) associated with the development of the pars marginalis. Type II was further divided into Type IIa and Type IIb depending on whether the muscle fibers were well developed and connected. Results: On the midline of the lip, Type I, in which the pars marginalis was rarely observed and only appeared in traces, was observed in 20.0% of the volunteers. Type IIa, in which the pars marginalis was well-developed and appeared continuous, was observed in 42.9% of the volunteers. Type IIb, in which the pars marginalis was observed but appeared discontinuous, was observed in 37.1% of the volunteers. Conclusions: The shapes of the upper pars marginalis of the OOr varied markedly between volunteers. Type classification of the OOr based on its shape and the lip appearance serves as a reliable source of reference information to be utilized when injecting botulinum toxin into the upper lip.
Full Text
https://academic.oup.com/asj/article/40/7/778/5639737
DOI
10.1093/asj/sjz341
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Oral Biology (구강생물학교실) > 1. Journal Papers
Yonsei Authors
Kim, Hee Jin(김희진) ORCID logo https://orcid.org/0000-0002-1139-6261
Hu, Kyung Seok(허경석) ORCID logo https://orcid.org/0000-0002-9048-3805
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/179436
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