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Application of transmitted laser light for the assessment of human pulp vitality

应用透射激光评估人体牙髓活力

基本信息

批准号：
08557104
负责人：
SASANO Takashi
金额：
$ 1.54万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08557104/
关键词：
pulp diagnosis pulp vitality test laser Doppler flowmeter pulpal blood flow transmitted laser light

项目摘要

The purpose of this study was to determine if use of transmitted laser light might enable a better assessment of human pulpal vitality than does back-scattered light (LDF : laser Doppler flowmetry). The experiments were carried out on 10 upper central incisors in 6 subjects aged 23-28 years ; 5 of the teeth were vital with no restoration, and 5 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 (BF) 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 BF (corresponding to BP increases) were recorded from both the center and 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 BF changes corresponding to BP increases were more clearly observed. These results indicate that transmitted laser light would be useful for the assessment of tooth pulp vitality both because the blood flow signals do not include flow of non-pulpal origin, and because its output signals and response to BF changes are larger and so can be more easily monitored.

本研究的目的是确定使用透射激光是否可以比反向散射光（LDF：激光多普勒血流仪）更好地评估人类牙髓活力。实验在6名23-28岁受试者的10颗上中切牙上进行;其中5颗牙齿是没有修复的活髓牙齿，5颗是非活髓牙齿。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（BF）：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）透射激光的输出信号全部记录为零，并且在牙齿上任何位置的记录中均看不到振荡，但是（2）LDF信号高于零，存在与心率相关的规则振荡，并且BF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BP增加），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与BP增加相对应的被动BF变化。这些结果表明，传输的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起源的流动，因为它的输出信号和BF变化的响应更大，因此可以更容易地监测。