Change in brain blood flow of forehead and temporal region during unilateral chewing

为了阐明咀嚼运动与脑血流量的关系，研究了单侧咀嚼过程中脑血流量的变化。结果如下：20名健康受试者在咀嚼过程中，颞区深层血流显着增加，咀嚼停止后下降，咀嚼后3分钟恢复到原来的状态。非咀嚼侧脑血流量增加幅度大于咀嚼侧，两者差异有统计学意义。20名健康受试者左右两侧咀嚼时，颞区深层血流量在咀嚼过程中增加，停止咀嚼后下降，并恢复到原来的水平。左侧咀嚼时(B期)右侧颞区深层血流量大于右侧咀嚼时(A期)。左侧颞区深血流量A期大于B期，差异有统计学意义。10名健康受试者，无论是习惯侧咀嚼还是非习惯侧咀嚼，左侧颞区深层血流量在咀嚼过程中增加，在咀嚼停止后下降，并恢复到原来的水平。而习惯性侧咀嚼的脑血流量增加幅度明显大于非习惯性侧咀嚼，提示咀嚼对侧脑深部血流量的增加可能是对侧强于咀嚼侧，习惯性侧咀嚼较非习惯性侧咀嚼强。

In order to clarify the relationship between masticatory movement and brain blood flow the change of blood flow during unilateral chewing was investigated. Results was the following.For the 20 healthy subjects the deep blood flow of the temporal region significantly increased during mastication and decreased when mastication ceased and returned to its original state at three minutes after chewing. And the increase of brain blood flow of the non-chewing side was larger than that of the chewing side ; A statistically significant difference was found between the two.For the 20 healthy subjects the deep blood flow of the temporal region increased during mastication and decreased when mastication ceased and returned to its original state in both right and left side chewing. The amount of deep blood flow of the right temporal region was larger in the left side chewing (period B) than in the right side chewing (period A). On the other hand the amount of deep blood flow of the left temporal region was larger in the period A than in the period B. A statistically significant difference was found between the two periods.For the 10 healthy subjects the deep blood flow of the temporal region increased during mastication and decreased when mastication ceased and returned to its original state in both habitual and non-habitual side chewing. And the increase of brain blood flow for the habitual side chewing was significantly larger than that for the non-habitual side chewing.From these results it was suggested that the deep blood flow of the temporal region increase by mastication and the activation was probably strong in opposite side than in chewing side, and in habitual side chewing than in non-habitual side chewing.