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Growth effects of botulinum toxin type A injected unilaterally into the masseter muscle of developing rats

机译:单侧注入发育中大鼠咬肌中的A型肉毒毒素的生长作用

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摘要

Objective: To evaluate the effects of botulinum toxin type A (BTX-A) on mandible skeletal development by inducing muscle hypofunction. Methods: Four-week-old Sprague-Dawley rats (n=60) were divided into three groups: Group 1 animals served as controls and were injected with saline; Group 2 animals were injected unilaterally with BTX-A (the contralateral side was injected with saline); and Group 3 animals were injected bilaterally with BTX-A. In Group 2, the saline-injected side was designated the control side (Group 2-1), whereas the BTX-A-injected side was designated the experimental side (Group 2-2). After four weeks, the animals were sacrificed, dry skulls were prepared, and mandibles were measured. Results: In the unilateral group, the experimental side (Group 2-2) had reduced dimensions for all mandible measurements compared with the control side (Group 2-1), suggesting a local effect of BTX-A on mandible growth, likely due to muscle reduction. Conclusions: Localized BTX-A injection induced a change in craniofacial growth, and the skeletal effect was unilateral despite both sides of the mandible functioning as one unit.
机译:目的:通过诱导肌肉功能低下来评估A型肉毒毒素(BTX-A)对下颌骨骨骼发育的影响。方法:将四周大的Sprague-Dawley大鼠(n = 60)分为三组:第1组作为对照组,并注射生理盐水;第1组作为对照组。第2组动物单侧注射BTX-A(对侧注射生理盐水)。第3组动物向两侧注射BTX-A。在组2中,将注射盐水的一侧称为对照侧(组2-1),而将注射BTX-A的一侧称为实验侧(组2-2)。四周后,处死动物,准备干燥的头骨,并测量下颌骨。结果:在单侧组中,与对照侧(2-1组)相比,实验侧(第2-2组)所有下颌骨测量的尺寸均减小,表明BTX-A对下颌骨生长的局部影响,可能是由于肌肉减少。结论:局部BTX-A注射引起颅面生长变化,尽管下颌骨的两侧均作为一个单元,但骨骼作用是单方面的。

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