[Response properties of the jaw-closing muscle spindle during decreased occlusal vertical dimension in rats].

Kokubyo Gakkai zasshi. The Journal of the Stomatological Society, Japan Pub Date : 2008-03-01 DOI:10.5357/koubyou.75.1

Koichi Fujita

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引用次数: 3

Abstract

The masseter-muscle spindle is regarded as being highly adaptable to increases in the occlusal vertical dimension (iOVD), it is hypothesized that spindle function would adapt to a decrease in occlusal vertical dimension (dOVD) as well. Seventy-five 5-week-old female Wistar rats were divided into Control (n = 25) and Experimental (n = 50) groups; those in the Experimental group received a 2.0-mm composite resin build-up to the maxillary molars. The Experimental group was divided into the resin-removal group (n = 25, build-up resin was removed) and the non resin-removal group (n = 25) 8 weeks later; i. e., when the animals were 13 weeks old. Electrophysiological recordings were obtained from masseter-muscle spindle afferents in 13, 14, 15, 19, 21-week-old rats (n = 5 rats each) under general anesthesia Masseter-muscle spindle sensitivity was significantly lower in the resin-removal group 1 week after resin-removal and for the rest of the observation period. The present results indicate that masseter-muscle spindles may not completely adapt to dOVD and may affect jaw function.

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[大鼠咬合垂直维数下降时合颌肌纺锤体的反应特性]。

咬肌纺锤体对咬合垂直维数(iOVD)的增加具有高度的适应性，假设纺锤体功能也能适应咬合垂直维数(dOVD)的降低。75只5周龄雌性Wistar大鼠分为对照组(n = 25)和试验组(n = 50);实验组接受2.0 mm复合树脂修复上颌磨牙。8周后，实验组分为去除树脂组(n = 25，去除堆积树脂)和不去除树脂组(n = 25);也就是说，当动物13周大的时候。取13、14、15、19、21周龄大鼠(各5只)全麻下咬肌-纺锤体传入电生理记录，取树脂组咬肌-纺锤体敏感性在取树脂后1周及其余观察期均明显降低。目前的结果表明咬肌纺锤体可能不完全适应dOVD，并可能影响颌骨功能。

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Kokubyo Gakkai zasshi. The Journal of the Stomatological Society, Japan

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