Changes of masseter muscle activity following injection of botulinum toxin type A in adult rats

C. Y. Tsai, Y. Y. Lei, L. Y. Yang, W. C. Chiu

研究成果: 雜誌貢獻文章同行評審

6 引文 斯高帕斯(Scopus)


Objectives: To investigate changes in masseter muscle function following intramuscular injection of different dose-dependent botulinum toxin type A (BTXA). Setting and Sample Population: Department of Orthodontics at Taipei Medical University. Fifty-two, 70-day-old male Wistar rats were randomly divided into four groups. Group I received 7.5 U of BTXA (0.3 ml), Group II received 5.0 U, and Group III received 2.5 U in the right masseter muscle, respectively. Group IV is the control and received no BTXA injection. Materials and Methods: A wire electrode device was implanted to record muscle activity. One week after implantation, the rats were fed every 2 h and EMG signals were recorded during the first hour. All signals were recorded for 12 weeks. Thereafter, EMG data were analyzed for statistical calculation and weights of masseter muscles were measured. Results: Masseter muscle activity decreased 99% during the first week after BTXA injection and gradually recovered from the 3rd week on in Groups I-III. By the 12th week, muscle activity recovered to 41% in Groups I and II and 56.26% in Group III. No significant changes of muscle activity were observed in Group IV. Conclusion: BTXA induced a reduction in masseter muscle activity and an increased toxin dose resulted in greater depression of muscle activity.
頁(從 - 到)202-211
期刊Orthodontics and Craniofacial Research
出版狀態已發佈 - 11月 1 2015

ASJC Scopus subject areas

  • 正畸
  • 口腔外科
  • 耳鼻咽喉科
  • 手術


深入研究「Changes of masseter muscle activity following injection of botulinum toxin type A in adult rats」主題。共同形成了獨特的指紋。