ADAPTATION OF THE MASSETER AND TEMPORALIS MUSCLES FOLLOWING ALTERATION IN LENGTH, WITH OR WITHOUT SURGICAL DETACHMENT
ADAPTATION OF THE MASSETER AND TEMPORALIS MUSCLES FOLLOWING ALTERATION IN LENGTH, WITH OR WITHOUT SURGICAL DETACHMENT
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DOI：
10.1002/ar.1092000203
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发表时间：
1981-01-01
影响因子：
--
通讯作者：
FAULKNER, JA
中科院分区：
文献类型：
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作者：
MAXWELL, LC;CARLSON, DS;FAULKNER, JA
通过口内矫治器或剥离咀嚼肌功能长度的改变，对雌性恒河猴咀嚼肌的组织化学特性、肌纤维横截面积、肌纤维长度和氧化能力进行了评价。实验组仅接受矫治器(A)；矫治器和随后的咬肌脱离(AD)；矫治器和咀嚼肌分离，但手术将咬肌重新连接到耻骨肌悬吊(ADR)；不使用矫治器，但松开并重新连接咬肌(DR)；或在24周后拆除矫治器以研究治疗后反应(PT)。实验开始后4~48wk处死动物，取内翻肌进行肌肉研究。在生理范围内拉伸咬肌和颞肌并没有显著改变纤维类型的比例，尽管纤维的氧化能力降低了。肌原纤维ATPase活性中等的纤维在实验肌肉中并不比对照肌肉更常见。在某些实验过程中，咬肌的I型纤维横截面积减小，这表明这些纤维的募集对颌骨功能的改变最敏感。任何一种实验程序都能引起肌肉毛细血管的微小改变。PT组咬肌纤维长度和AD、ADR组颞肌纤维长度均大于对照组。
Histochemical properties, muscle fiber cross-sectional area, muscle fiber length and the oxidative capacity of masticatory muscles of female rhesus monkeys were assessed following alteration in functional length by an intraoral appliance or by detachment of the muscle. Experimental groups received the appliance only (A); the appliance and subsequent detachment of the masseter (AD); the appliance and detached masseter, but with surgical reattachment of the masseter to the ptyerygomasseteric sling (ADR); no appliance, but detachment and reattachment of masseter (DR); or an appliance which was removed after 24 wk to study posttreatment responses (PT). Animals were sacrificed and the muscles were studied at invervals from 4-48 wk after initiation of the experimental period. Stretching the masseter and temporalis muscles within physiological limits did not significantly alter the proportion of fiber types, although oxidative capacity of the fibers was reduced. Fibers with intermediate myofibrillar ATPase activity were no more prevalent in experimental than control muscles. The cross-sectional area of Type 1 fibers of masseter muscles decreased following some experimental procedures, indicating that recruitment of these fibers is the most sensitive to altered jaws function. Minimal alteration of muscle capillarity was induced by any of the experimental procedures. The lengths of masseter muscle fibers in Group PT and of temporalis muscle fibers in groups AD and ADR were greater than in control animals.