Abstract
The penetration depth and the power density of photobiomodulation (PBM) in human tissue under real conditions remain unclear to date. A novel quantitative measurement method was proposed in this study. This study aimed to design a noninvasive measurement system for the quantitative calculation of PBM dose on the attached gingiva. A flexible facial fixture appliance (FFFA) and nine piece detectors were mounted on the retainer to detect the real dose of 660 and 830 nm lasers on the attached gingiva. In addition, the angular distribution of light scattering and the light propagation in the biotissue were obtained. Two cases (a female and a male) are presented in this study. Experimental results demonstrated that the real power density of laser in the target tissue can be measured exactly after the laser light penetrates the orbicularis oris. Simulation results match with real conditions. Conversely, slight differences in power density are observed in the tissue radiated with collimated and uncollimated laser. The proposed method can be used to calculate the real dose in the target tissue for stomatology and deep acupoint stimulation.
Highlights
Since the first laser device was developed by Maiman in 1960 [1], the effects of laser radiation on the oral tissue have been studied [2, 3]
Mester introduced the use of noninvasive laser radiation as a biostimulator by applying lowlevel laser therapy (LLLT) to stimulate the biological processes in wound healing [4]
Auto Current Control Circuit Designed for Driving Laser Diode. e auto current control (ACC) circuit (Figure 1(a)) was designed and realized on a double-sided circuit board (Figure 1(b)). e laser was driven by ACC circuit
Summary
Since the first laser device was developed by Maiman in 1960 [1], the effects of laser radiation on the oral tissue have been studied [2, 3]. Mester introduced the use of noninvasive laser radiation as a biostimulator by applying lowlevel laser therapy (LLLT) to stimulate the biological processes in wound healing [4]. To analyze the photon propagation in biotissue, a previous study punctually radiated the palm of the hand with He-Ne laser and simulated and measured the backscattering light received by a detector in different positions [14]. Two- and four-layer models of the skin were used to simulate light propagation, and the backscattered light received with a detector was published [15].
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