Kinematics of the tooth tapping movement.
Kinematics of the tooth tapping movement.
复制标题
攻牙运动的运动学。
DOI：
10.1111/j.1365-2842.1977.tb00988.x
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发表时间：
1977
影响因子：
2.9
通讯作者：
B. Hedegård
中科院分区：
文献类型：
--
作者：
S. Widmalm;B. Hedegård
咬肌的电活动和牙齿接触振动同时被记录下来，受试者缓慢地敲打他们的牙齿，达到最大的齿间啮合，然后再次达到最大的频率。10个研究对象中的4个也使用了高速电影摄影技术。根据所获得的攻牙运动图形，可以将攻牙过程分为三个主要阶段：接触阶段（TCP）、开启阶段（OP）和关闭阶段（CP）。通过减小下颌张开度和TCP、OP、CP持续时间增加攻牙频率，但未增加牙齿接触前的颌速，这可能对反射反应有重要意义。平均颚速从10 cm/s增加到15 cm/s，因为高频攻丝比低频攻丝更突然。高频率轻叩牙后脑电活动持续时间明显短于低频率轻叩牙后脑电活动持续时间。牙齿保持接触，在每个开合周期之间没有可检测到的反弹。在低频率和高频率的电活动停止后约100毫秒开始OP。电活动结束和新OP开始之间的时间应该取决于咬肌的松弛时间。
Electrical activity in the masseter muscles and tooth contact vibrations were recorded simultaneously from subjects tapping their teeth slowly into maximal intercuspidation and again with maximal frequency. High speed cinephotography was also used with four of the ten subjects. Three main parts could be distinguished on the obtained graphical representation of the tooth tapping movement: tooth contact phase (TCP), opening phase (OP) and closing phase (CP). Tapping frequency was increased by decreasing the jaw opening degree and the durations of TCP, OP and CP. The jaw velocity immediately before tooth contact, which may be of significance for the reflex response, was however not increased. The average jaw speed was nevertheless increased from 10 to 15 cm/s since the turning from OP to CP was more abrupt in high than in low frequency tapping. The duration of electrical activity after tooth contact was significantly shorter at tapping with high than with low frequency. The teeth maintained contact without detectable rebound between each open-close cycle. The OP started about 100 ms after the cessation of electrical activity both at low and high tapping frequency. The time between end of electrical activity and the start of a new OP was supposed to be dependent upon the relaxation time of the masseter muscles.