Morphologic and Bony Structural Changes in the Mandible After a Unilateral Injection of Botulinum Neurotoxin in Adult Rats

Chi Yang Tsai, Rouh Yi Huang, Chi-Ming Lee, Wen Tien Hsiao, Liang Yo Yang

研究成果: 雜誌貢獻文章同行評審

25 引文 斯高帕斯(Scopus)

摘要

Purpose: Previous animal experiments showed how reduced masticatory function plays an important role in the craniofacial and mandibular regions in the growing period. However, articles focusing on the effects of reduced masticatory function in adult animals are quite scarce. The purpose of this study was to evaluate the effects of reduced masticatory muscle activity on the jaw bones of adult rats. Materials and Methods: Botulinum neurotoxin type A (BTX-A) was injected into the left masseter muscle to reduce masticatory muscle function, and sequential changes in the jaw bones were investigated. Ten male 60-day-old Sprague-Dawley rats with a mean body weight of about 300 g were used. The following procedures were performed on each sample: 25 U/mL (0.3 mL) of BTX-A was injected into the left masseter muscle, whereas the right masseter muscle received an equal amount of sterilized saline solution. Ninety days after the procedure, the rats were sacrificed, and the weights of the masseter muscles were recorded. Meanwhile, direct anthropometric measurements were taken, and the cortical thickness, trabecular thickness, and bone mineral content of the skull and mandible were measured. All measurements were evaluated with statistical software. Results: There were significant differences in all measurements on the BTX-A side compared with those on the control side. The differences included a decreased ramus height, increased gonial angle, and increased crown height of the posterior teeth on the injection side. Significant decreases in the muscle weight, bone mineral content, cortical thickness, and trabecular thickness were also seen on the paralyzed side compared with the non-injection side. Conclusions: We found that reduced masticatory function in adult rats affected the weight of the masseter muscle and the bony structure and dentition.
原文英語
頁(從 - 到)1081-1087
頁數7
期刊Journal of Oral and Maxillofacial Surgery
68
發行號5
DOIs
出版狀態已發佈 - 五月 2010

ASJC Scopus subject areas

  • 口腔外科
  • 耳鼻咽喉科
  • 手術

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