Surface Mapping of Masseter for Botulinum Toxin Injection

교근에서 보툴리눔 독소 주사점의 표지화

  • Kim, Jun Hyung (Deparment of Plasic and Reconstructive Surgery, Keimyung University School of Medicine) ;
  • Lee, Min Jae (Deparment of Plasic and Reconstructive Surgery, Keimyung University School of Medicine) ;
  • Kim, Hyun Ji (Deparment of Plasic and Reconstructive Surgery, Keimyung University School of Medicine) ;
  • Son, Dae Gu (Deparment of Plasic and Reconstructive Surgery, Keimyung University School of Medicine) ;
  • Han, Ki Hwan (Deparment of Plasic and Reconstructive Surgery, Keimyung University School of Medicine) ;
  • Lee, So Young (Deparment of Rehabilitation, Keimyung University School of Medicine) ;
  • Lim, Jung Guen (Deparment of Neurology, Keimyung University School of Medicine) ;
  • Choi, In Jang (Deparment of Anatomy, Keimyung University School of Medicine)
  • 김준형 (계명대학교 의과대학 성형외과학교실) ;
  • 이민재 (계명대학교 의과대학 성형외과학교실) ;
  • 김현지 (계명대학교 의과대학 성형외과학교실) ;
  • 손대구 (계명대학교 의과대학 성형외과학교실) ;
  • 한기환 (계명대학교 의과대학 성형외과학교실) ;
  • 이소영 (계명대학교 의과대학 재활의학과학교실) ;
  • 임정근 (계명대학교 의과대학 신경과학교실) ;
  • 최인장 (계명대학교 의과대학 해부학교실)
  • Received : 2005.02.18
  • Published : 2005.05.10

Abstract

Generally, many Asian women tend to dislike the square jaw, as they believe it makes the face look wider, giving a stubborn and strong impression. Contouring of the mandible is therefore a relatively common aesthetic procedure among Asians. These days, the use of botulinum toxin for contouring of the lower face offer simple alternative to surgery. Motor point, which is the site over a muscle where its contraction may be elicited by a minimal intensity short duration electrical stimulus, is the optimal injection point of botulinum toxin. Study was undertaken to identify the location of motor point of the masseter muscle and the skin surface landmark. First, the thickest point of the masseter muscle was inspected through palpation and inspection by 3 different individual plastic surgeons and then compound muscle action potentials(CMAPs) of masseter muscle in 15 health volunteers were recorded using EMG. For the localization of the measured points, line between lateral canthus to the mandibular angle was used. Location of motor points were mapped to skin surface from lateral canthus in a percentage of the distance along the landmark line and in distance in millimeters. The clinical injection point was located at 71.69 percentile and 7.3 mm of the landmark line. The motor point test was located at 72.54 percentile and 7.1 mm of the landmark line. The depth of motor point was 16mm. There was no statistically significant difference between the clinical injection point and the motor point. We conclude that surface mapping of motor point of the masseter muscle would increase accessibility and accuracy in botulinum toxin injection for contouring of the lower face.

Acknowledgement

Supported by : 계명대학교

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