Reliability and sensitivity of jerk-cost measurement for evaluating irregularity of chewing jaw movements
Reliability and sensitivity of jerk-cost measurement for evaluating irregularity of chewing jaw movements
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DOI：
10.1088/0967-3334/27/7/005
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发表时间：
2006-07-01
影响因子：
3.2
通讯作者：
Takagi, Masato
中科院分区：
文献类型：
--
作者：
Takada, Kenji;Yashiro, Kohtaro;Takagi, Masato
运动加速度的变化率（加加速度）是一个普遍接受的量，以评估人类的肢体和眼睛运动的不规则性。本研究的目的是证明的咀嚼颌运动的加加速度测量的可靠性，并确定其灵敏度，以区分不同的咬合干扰的存在下进行的运动。咀嚼口香糖时的下颌运动用3D跟踪装置记录。12名成年受试者参加了实验。对于5名受试者，在两个不同的场合下测量的标准化挺举成本（NJC）进行了比较。对于7名受试者，在关闭过程中的NJC进行了比较，与/不引入四种不同类型的咬合干扰的测量。NJC在两个记录场合之间没有显著差异。犬齿的干扰比臼齿的干扰引起更大的NJC增加。重复测量之间的比较揭示了NJC的再现性。此外，NJC被证明能够区分犬齿和臼齿部位咬合干扰引起的运动不规则性。这些结果表明，NJC是一个有效的指标，咀嚼颌运动不规则引起的干扰，上下牙之间的完全交错。
Rate of change in movement acceleration ( jerk) is a universally accepted quantity to evaluate irregularities of human limb and eye movements. This study was aimed to attest reliability of the jerk measurement of masticatory jaw movements and to identify its sensitivity to discriminate between movements performed with the presence of varied occlusal interference. Jaw movements during gum chewing were recorded with a 3D tracking device. Twelve adult subjects participated in the experiments. For five subjects, normalized jerk-costs (NJC) during jaw closing were compared between those measured on two separate occasions. For seven subjects, the NJCs during closing were compared with those measured with/without introduction of four different types of occlusal interference. The NJCs did not differ significantly between the two recording occasions. The interference at the canine tooth induced greater increase in the NJCs than that at the molar tooth. The comparison between repeated measures revealed reproducibility of the NJCs. In addition, the NJC was shown to be capable of discriminating between irregularities of the movements induced by occlusal interference at the canine and molar tooth sites. These findings suggest that the NJC is a valid indicator of masticatory jaw movement irregularity induced by disturbances of full intercuspation between upper and lower teeth.