Possible application of transmitted laser light for the assessment of human pulpal vitality.
Possible application of transmitted laser light for the assessment of human pulpal vitality.
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可能应用透射激光来评估人类牙髓活力。
DOI：
10.1111/j.1600-9657.1997.tb00016.x
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Miyahara
中科院分区：
文献类型：
--
作者：
T. Sasano;I. Nakajima;N. Shoji;S. Kuriwada;D. Sanjo;H. Ogino;T. Miyahara
本研究的目的是确定使用透射激光是否能够比反向散射光（LDF：激光多普勒血流仪）更好地评估人类牙髓活力。该实验对6名年龄在23-28岁之间的受试者的10颗上中门牙进行;其中5颗牙齿是重要的，没有修复，5颗牙齿是非重要的。为了与透射激光一起使用，使用常规LDF装置的探针内的纤维，一个用于将光透射到颊表面上，另一个用于在同一牙齿的腭表面处接收光。对于LDF，探针固定在颊面。在每个实验牙齿上的三个不同位置测量血流量：牙冠的切端三分之一，中心和颈端三分之一。在非活髓牙中，1）具有透射激光的输出信号全部记录为零，并且在来自牙齿上的任何位置的记录中看不到振荡，但是2）LDF信号高于零，存在与心率相关的规则振荡，以及血流量的被动增加从牙齿的中心和颈部三分之一处记录了LDF（对应于血压升高），表明LDF记录了非牙髓起源的血流。在活髓牙中，LDF信号在牙齿上的每个位置均显著高于非活髓牙。在活齿的中心部位，透射激光的输出信号约为LDF的两倍，并且更清楚地观察到对应于血压升高的被动血流变化。这些结果表明，透射激光将是有用的牙髓活力的评估，因为血流信号不包括非牙髓源的流动，因为它的输出信号和对血流变化的响应是清晰的，可以很容易地监测。
The purpose of this study was to determine whether use of transmitted laser light would enable a better assessment of human pulpal vitality than back-scattered light does (LDF: laser Doppler flowmetry). The experiments were carried out on ten upper central incisors in six subjects aged 23-28 years; five of the teeth were vital with no restoration, and five were non-vital. For use with transmitted laser light, the fibers within the probe of a conventional LDF apparatus were used, one for transmitting light onto the buccal surface, the other for receiving it at the palatal surface of the same tooth. For LDF, the probe was fixed at the buccal surface. Blood flow was measured at three different locations on each experimental tooth: the incisal third, the center and the cervical third of the tooth crown. In non-vital teeth, 1) output signals with transmitted laser light all registered zero, and no oscillation could be seen in recordings from any location on the tooth, but 2) LDF signals were above zero, there were regular oscillations related to heart rate, and passive increases in blood flow (corresponding to blood pressure increases) were recorded from both the center and the cervical third of the tooth, indicating that LDF registered blood flow of non-pulpal origin. In vital teeth, LDF signals were significantly higher than in non-vital teeth at each location on the tooth. At the central site on vital teeth, the output signals for transmitted laser light were about twice those seen with LDF, and passive blood flow changes corresponding to blood pressure increases were more clearly observed. These results indicated that transmitted laser light would be useful for the assessment of tooth pulp vitality both because the blood flow signals did not include flow of non-pulpal origin, and because its output signals and response to blood flow changes were clear and could easily be monitored.