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Relationship between facial asymmetry and masseter reflex activity
http://hdl.handle.net/10191/1173
http://hdl.handle.net/10191/11739416a5f7-6e95-49ae-b295-7bae9184e097
| 名前 / ファイル | ライセンス | アクション |
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24_0005.pdf (153.4 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2007-04-23 | |||||
| タイトル | ||||||
| タイトル | Relationship between facial asymmetry and masseter reflex activity | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | journal article | |||||
| 著者 |
Machida, Naoki
× Machida, Naoki× Yamada, Kazuhiro× Takata, Yoshiyuki× Yamada, Yoshiaki |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 6800 | |||||
| 姓名 | 山田, 一尋 | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Purpose: This study evaluated the tonic vibration reflex (TVR) of the masseter muscles in patients with facial asymmetry. Subjects and Methods: The experiment was performed on 10 volunteers without facial asymmetry and 12 orthognathic patients with facial asymmetry. Subjects were seated in a chair, and held a stimulator composed of an electric motor and an acrylic bite block between the upper and lower dentitions at facial midline, in order to elicit TVR. EMG activity was recorded using a pair of silver electrodes affixed bilaterally with adhesive tape to the skin over the superficial masseter. The amount of mandibular deviation was measured on the frontal cephalogram. The reflex response was evaluated by the TVR index (%)=∫TVR x 100/∫maximum voluntary contraction (MVC) and the TVR ratio (∫TVR on the high MVC side/∫TVR on the low MVC side). Results: In the patient group, the average TVR index on the deviated side was significantly higher than on the non-deviated side. In all subjects, including the control and patient groups, a negative correlation between the amount of mandibular deviation and the side-to-side difference in TVR index was seen (r=-0.536, p<0.05, n=22). Also, patients with lower MVC on deviated side than on the non-deviated side, showed a significantly higher TVR ratio than that of the control group. Conclusions: These results suggested that the difference between the right and left reflex response elicited by TVR might be related to frontal craniofacial morphology. The mandible is unique in its structure; i.e., 1) it consists of a body with its ascending ramus on each side, 2) it is only connected with the other bones of the skull by synovial joints, and 3) masticatory muscles, such as masseter and temporal muscles, attach themselves to it symmetry. By the time of appearance of the mammals, powerful masticatory muscles had developed that were capable of utilizing the mechanical leverage made available by the ossified craniofacial structures and the joint. These changes were associated with appropriate evolutionary changes in the dentition to provide these mammals with the ability for eating either a carnivorous or an herbivorous diet. Until recently, it was believed that the mandible grows symmetrically in the craniofacial system. Therefore, there has been reports about facial morphology and muscle function, but no attention to facial asymmetry.1-3 However, malocclusion and/or mandibular dysfunction due to asymmetry in the craniofacial morphology are being increasingly reported on.4-7 In patients with mandibular deviation, it is important to understand the relationship between craniofacial morphology and voluntary muscle activity, in order to estimate mandibular growth and possible reactions to orthodontic treatment. | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Thus, the relationship between them has been extensively studied. It has been reported that in growing animals, either unilateral destruction of the trigeminal motor nucleus or unilateral resection of the masticatory muscle caused an asymmetrical morphological change in the mandible.8,9 The results strongly suggested an influence of muscle activity on craniofacial morphology. Since then, electromyographic (EMG) studies have been done to seek a possible relationship between craniofacial asymmetry and masticatory muscle activity at maximum clenching.4-7 However, they have yielded contradictory results, and in fact only a small fraction of the day is spent with maximum voluntary contraction of the masticatory muscle. Since during the major part of the day, the posture of the mandible is reflexly maintained based on various peripheral sensory inputs, the relationship between mandibular deviation and reflex activity in the masticatory muscle could be considered worth investigating. Muscle spindles, which are proprioceptors, are deeply involved in the reflex control of masticatory muscles, and it has been assumed that their sensitivity is controlled by the gamma-motor drive.10,11 It is also known that the primary endings of muscle spindles are sensitive to and respond vibration over 150 Hz, which elicits continuous muscle contraction.12 This phenomenon has been termed the tonic vibration reflex (TVR). Muscle activity induced by TVR may be regarded as an activation of the gamma-motor drive controlling the primary endings.13-15 In the present study, reflex muscle activity was measured during TVR in bilateral masseter muscles, in order to investigate the relationship between mandibular deviation and reflex activity in the masticatory muscle. | |||||
| 書誌情報 |
Journal of oral and maxillofacial surgery en : Journal of oral and maxillofacial surgery 巻 61, 号 3, p. 298-303, 発行日 2003-03 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 02782391 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA10628202 | |||||
| PubMed番号 | ||||||
| 識別子タイプ | PMID | |||||
| 関連識別子 | 12618968 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | info:doi/10.1053/joms.2003.50060 | |||||
| 権利 | ||||||
| 権利情報 | American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Science(USA). | |||||
| 著者版フラグ | ||||||
| 値 | author | |||||
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Cite as
Machida, Naoki, Yamada, Kazuhiro, Takata, Yoshiyuki, Yamada, Yoshiaki, 2003, Relationship between facial asymmetry and masseter reflex activity: 298–303 p.
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