Topography of the masseter muscle in relation to treatment with botulinum toxin type A

Hu, Kyung Seok; Kim, Seong Taek; Hur, Mi Sun; Park, Jae Young; Song, Wu‐Chul; Koh, Ki Seok; Kim, Hee Jin

doi:10.1016/j.tripleo.2009.12.036

Cited by 50 publications

(35 citation statements)

References 10 publications

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“…The BoNT-A injection sites are shown in Figure 1. [21][22][23] In the masseter muscle, the first site was the inferior, prominent part of the masseter muscle that was observed when the subject was asked to clench, and the other 2 sites formed a triangle 10 mm away from the first site ( Figure 1A). In the temporalis muscle, the first site was the prominent part of the anterior temporalis muscle that was observed when the subject was asked to clench, which was parallel to eyebrow.…”

Section: Botulinum Toxinmentioning

confidence: 99%

“…[21][22][23] In the BoNT injection procedure, the most effective point of injection is the area where the appropriate nerve innervates the affected muscle. The bulky region of the masseter and temporalis muscles has been regarded as an effective injection point clinically as the richest arborized area of the perforating nerve branches.…”

Section: Bont-a Injectionmentioning

confidence: 99%

“…The bulky region of the masseter and temporalis muscles has been regarded as an effective injection point clinically as the richest arborized area of the perforating nerve branches. [21][22][23] Previous studies reporting the effect of BoNT-A on bruxism used dose ranging from 15 to 60 U (equivalent to those of Neuronox). [11][12][13][14][15][16][17][18][19] Kim et al showed that the effects of BoNT-A on the muscular thickness and EMG changes of the masseter muscle did not differ between 25 and 35 U injections.…”

Section: Bont-a Injectionmentioning

confidence: 99%

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Effects of Botulinum Toxin on Jaw Motor Events during Sleep in Sleep Bruxism Patients: A Polysomnographic Evaluation

Shim

Lee

Kato

et al. 2014

Journal of Clinical Sleep Medicine

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BRIEF SUMMARYCurrent Knowledge/Study Rationale: Botulinum toxin type A (BoNT-A) has been used for managing involuntary orofacial movements and secondary bruxism in patients with movement disorders, but its usefulness and objective effects on sleep bruxism (SB) have not been evaluated using objective measures. The aim of this study was to investigate the effects of intramuscular BoNT-A injection on orofacial motor events during sleep in patients with clinical diagnosis of SB. Study Impact: A single injection of BoNT-A into jaw-closing muscles is an effective strategy for controlling SB for at least a month. It reduces the intensity rather than the generation of the contraction in the jaw-closing muscles. Establishing management of SB with BoNT-A awaits further studies on larger samples over a longer follow-up period. Medicine, Vol. 10, No. 3, 2014 YJ Shim, MK Lee, T Kato et al equally effective in pain reduction when compared with oral splint. 17,18 The result of these studies and case reports were based on the subjective evaluation of SB, not on the objective assessment using electromyography (EMG) or polysomnography (PSG). A study using portable electromyographic (EMG) device showed that the counts of sleep related masticatory EMG bursts, detected by the pre-defined threshold, were significantly reduced after a single injection of BoNT-A in the masseter muscle. 19 However, it remains unclear how BoNT-A injection works specifically for sleep-related masticatory EMG activity, as a variety of jaw motor activities occur in association with transient arousal changes during sleep. 20 Video-polysomnography (vPSG) can be a useful tool allowing discrimination of the types of sleep-related masticatory EMG events. 2 In previous case reports and studies, some cases injected BoNT-A into the masseter muscle only, [13][14][15]17,18 and others into both the masseter and temporalis muscles. 10,11,15 The masseter and temporalis muscles are synergetic muscles and activated during teeth grinding and clenching; however, there have been no studies assessing the difference between the choices or the combination of the injected muscles for motor activity control of the jaw during sleep. 292 Journal of Clinical SleepTherefore, the aims of this study were to investigate the effects of intramuscular BoNT-A injection on jaw motor episodes using vPSG. In addition to the use of vPSG, we compared the effects of BoNT-A on jaw motor episodes between the injection sites (i.e., the masseter muscle injection only versus injection of both masseter and temporalis muscles). METHODS SubjectsThe protocol of this study was undertaken with the approval of Korea Food & Drug Administration and Institutional Review Board of the Yonsei University Dental Hospital. All subjects were informed of the nature of the study, and written consent was obtained from each participant.Twenty-four subjects (M: 10; F: 14, age: 20.2-38.7 years) were selected from among outpatients at the Department of Orofacial Pain and Oral Medicine, Yonsei University Dental Hospital. A...

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Section: Botulinum Toxinmentioning

confidence: 99%

Section: Bont-a Injectionmentioning

confidence: 99%

Section: Bont-a Injectionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Botulinum Toxin on Jaw Motor Events during Sleep in Sleep Bruxism Patients: A Polysomnographic Evaluation

Shim

Lee

Kato

et al. 2014

Journal of Clinical Sleep Medicine

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“…Furthermore, it is not clear how they determined soft-tissue landmarks from radiographs. Hu et al 4 dissected 40 adult Korean cadaver hemifaces and classified the course of the parotid duct in relation to a reference line between the tragus and the cheilion. They found that 42 percent of ducts were above this line, 21 percent followed the line or were below it, and 37 percent crossed the line from below (compared with 8 percent above, 39 percent below, and 53 percent crossing in our study).…”

Section: Discussionmentioning

confidence: 99%

“…2 It travels forward across the cheek superficial to the masseter muscle and then angles around the anterior border of the masseter to pierce the buccinator and open on the mucous membrane of the cheek opposite the upper second molar tooth 2 (although the junction between the first and second upper molars is probably more accurate). 3 The duct may be severed by a facial laceration and is also at risk of iatrogenic injury during injection of botulinum toxin into the masseter muscle 4 and facial rejuvenation surgery. 5,6 Accurate knowledge of its surface anatomy is therefore important.…”

mentioning

confidence: 99%

Redefining the Surface Anatomy of the Parotid Duct

Stringer

Mirjalili

Meredith

et al. 2012

Plastic and Reconstructive Surgery

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Topographic anatomy of the masseter muscle focusing on the tendinous digitation

et al. 2012

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The masseter muscle has superficial tendons that interdigitate like a saw (tendinous digitations), but a detailed description of these tendons is lacking in anatomic textbooks and atlases. The aim of the present study was to elucidate the topographic anatomy of the masseter muscle, focusing on its tendinous digitation. Sixty‐five adult faces (113 sides) were dissected. Five parameters, including the lengths, widths, and thickness of the muscle, were measured. The number and morphology of tendinous digitations were also investigated. The length and width of the masseter muscle were longer and wider in male specimens than in female specimens. The number of masseter muscle tendinous digitations was predominantly two in males and three in females. The length of the tendinous digitations tended to be about three‐quarters of that of the muscle. The second tendinous digitation was the longest in male specimens, while the first tendinous digitation was the longest in females. Based on our results, the external morphology of the masseter muscle does not match that described in anatomical atlases and textbooks. These findings may be helpful as a basic reference and in the treatment of masseter muscle hypertrophy and masseter tenomyositis. Clin. Anat. 25:889–892, 2012. © 2012 Wiley Periodicals, Inc.

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Topography of the masseter muscle in relation to treatment with botulinum toxin type A

Cited by 50 publications

References 10 publications

Effects of Botulinum Toxin on Jaw Motor Events during Sleep in Sleep Bruxism Patients: A Polysomnographic Evaluation

Effects of Botulinum Toxin on Jaw Motor Events during Sleep in Sleep Bruxism Patients: A Polysomnographic Evaluation

Redefining the Surface Anatomy of the Parotid Duct

Topographic anatomy of the masseter muscle focusing on the tendinous digitation

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