Possible application of transmitted laser light for the assessment of human pulp vitality. Part 2. Increased laser power for enhanced detection of pulpal blood flow
Possible application of transmitted laser light for the assessment of human pulp vitality. Part 2. Increased laser power for enhanced detection of pulpal blood flow
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DOI：
10.1111/j.1600-9657.2004.00280.x
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发表时间：
2005-02-01
影响因子：
2.5
通讯作者：
Miyahara, T
中科院分区：
文献类型：
--
作者：
Sasano, T;Onodera, D;Miyahara, T
本研究的目的是调查增加激光功率对活髓牙和非活髓牙传输的激光信号的影响，以期实现更好地评估人类牙髓活力与传输激光流量计。本实验对15名22-28岁受试者的61颗活髓牙（19颗上中切牙、16颗上侧切牙、16颗上尖牙和10颗第一前磨牙）和5颗非活髓牙（根管充填牙胶）进行了无修复实验。为了与发射的激光一起使用，使用常规激光多普勒流量计（LDF）装置的探针内的纤维，一个用于将光发射到唇表面上，另一个用于在同一牙齿的腭表面处接收光，如先前所报道的。激光输出功率设定为初始的2 mW，也设定为5、7和10 mW。在每个激光功率设置下，显示血流（BF）信号的活齿数量为：1）2 mW时12/19颗中切牙，5、7和10 mW时19/19颗中切牙，2）2、5、7和10 mW时19/19颗侧切牙，3）2 mW时0/16颗犬齿，5、7和10 mW时8、12和14颗犬齿，4）在2、5、7和10 mW下0/10第一前磨牙。因此，激光功率的增加增加了从较厚的牙齿（但不是从前磨牙）的BF检测。此外，在较高激光设置下观察到与心率同步的更清晰BF信号，以及继发于血压（BP）变化的更大被动BF变化。在非活髓牙中，没有观察到与心率或BP变化同步的信号，这表明即使在激光功率增加时，也没有用这种弹道光监测非牙髓起源的BF信号。这些结果表明，高功率透射激光可以是一个有用的工具，用于监测牙髓BF和牙髓活力的评估。
The purpose of this study was to investigate the effect of an increase in laser power on the transmitted laser signals from vital and non-vital teeth, in the hope of achieving a better assessment of human pulp vitality with the transmitted laser-light flowmeter. The experiments were carried out on total of 61 vital teeth with no restoration (19 upper central incisors, 16 upper lateral incisors, 16 upper canines, and 10 first premolars) and five non-vital upper central incisors (the root canals of which were filled with gutta-percha) in 15 subjects aged 22-28 years. For use with transmitted laser light, the fibers within the probe of a conventional laser Doppler flowmeter (LDF) apparatus were used, one for transmitting light onto the labial surface, the other for receiving it at the palatal surface of the same tooth, as reported previously. Laser output power was set at the original 2 mW and also at 5, 7, and 10 mW. The number of vital teeth displaying a blood flow (BF) signal at each laser power setting was: 1) 12/19 central incisors at 2 mW, 19/19 at 5, 7, and 10 mW, 2) 19/19 lateral incisors at 2, 5, 7, and 10 mW, 3) 0/16 canines at 2 mW, but eight, 12, and 14 at 5, 7, and 10 mW, 4) 0/10 first premolars at 2, 5, 7, and 10 mW. Thus, an increase in laser power increased BF detection from the thicker teeth (but not from premolars). In addition, clearer BF signals synchronized with heart rate, and greater passive BF changes secondary to blood pressure (BP) changes were observed at higher laser settings. In non-vital teeth, no signals synchronized with heart rate or BP changes were observed, indicating that no BF signal of non-pulpal origin was ever monitored with this ballistic light even when the laser power was increased. These results indicate that high-powered transmitted laser light could be a useful tool both for monitoring pulpal BF and for the assessment of tooth-pulp vitality.