Blood Flow Changes of a Superficial Temporal Artery Before and After Low-level Laser Irradiation Applied to the Temporomandibular Joint Area

Makihara, Eri; Masumi, Shin-ichi

doi:10.2186/jjps.52.167

Cited by 14 publications

(17 citation statements)

References 9 publications

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“…These transcription factors in return cause protein synthesis that triggers further effects down‐stream, such as increased cell proliferation and migration, alteration in the levels of cytokines, growth factors and inflammatory mediators, and increased tissue oxygenation . Moreover, NO is known to be a potent vasodilator via its effect on cyclic guanine monophosphate production and it can be speculated that LLLT may cause photodissociation of NO not only from CCO but also from intracellular stores such as nitrosylated forms of both hemoglobin and myoglobin leading to vasodilation and increased blood flow which was reported in several studies . Yamazaki and co‐workers observed an upregulation of hepatocyte growth factor (HGF) and HGF activator expression following irradiation of the backs of Sprague Dawley rats with linear polarized infrared laser .…”

Section: Hair and Types Of Hair Lossmentioning

confidence: 94%

Low‐level laser (light) therapy (LLLT) for treatment of hair loss

et al. 2013

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Objective Alopecia is a common disorder affecting more than half of the population worldwide. Androgenetic alopecia, the most common type, affects 50% of males over the age of 40 and 75% of females over 65. Only two drugs have been approved so far (minoxidil and finasteride) and hair transplant is the other treatment alternative. This review surveys the evidence for low-level laser therapy (LLLT) applied to the scalp as a treatment for hair loss and discusses possible mechanisms of actions. Methods and Materials Searches of PubMed and Google Scholar were carried out using keywords alopecia, hair loss, LLLT, photobiomodulation. Results Studies have shown that LLLT stimulated hair growth in mice subjected to chemotherapy-induced alopecia and also in alopecia areata. Controlled clinical trials demonstrated that LLLT stimulated hair growth in both men and women. Among various mechanisms, the main mechanism is hypothesized to be stimulation of epidermal stem cells in the hair follicle bulge and shifting the follicles into anagen phase. Conclusion LLLT for hair growth in both men and women appears to be both safe and effective. The optimum wavelength, coherence and dosimetric parameters remain to be determined.

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Section: Hair and Types Of Hair Lossmentioning

confidence: 94%

Low‐level laser (light) therapy (LLLT) for treatment of hair loss

et al. 2013

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“…The increase in facial temperature on the contralateral side might be caused by the vasodilator reflex via the central nervous system [23]. Although we found no temperature changes during LLLT in this study, an expansion of blood vessels and increase in blood flow could have occurred and influenced the non-treated skin regions during LLLT [22]. A recent within-subject comparison study showed that the combination of LLLT with a hair growth promoter had a greater effect on hair regrowth than did either independently [24].…”

Section: Discussionmentioning

confidence: 50%

“…Makihara et al demonstrated that the increase in facial temperature and blood temperature in the stimulated region by continuous laser irradiation caused an expansion of blood vessels and an increase in blood flow volume. Moreover, this process can also cause an increase in facial temperature in unstimulated regions [22]. The increase in facial temperature on the contralateral side might be caused by the vasodilator reflex via the central nervous system [23].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of wavelength-dependent hair growth effects on low-level laser therapy: an experimental animal study

Kim

Youn

2015

Lasers Med Sci

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In this study, we aimed to investigate the wavelength-dependent effects of hair growth on the shaven backs of Sprague-Dawley rats using laser diodes with wavelengths of 632, 670, 785, and 830 nm. Each wavelength was selected by choosing four peak wavelengths from an action spectrum in the range 580 to 860 nm. The laser treatment was performed on alternating days over a 2-week period. The energy density was set to 1.27 J/cm(2) for the first four treatments and 1.91 J/cm(2) for the last four treatments. At the end of the experiment, both photographic and histological examinations were performed to evaluate the effect of laser wavelength on hair growth. Overall, the results indicated that low-level laser therapy (LLLT) with a 830-nm wavelength resulted in greater stimulation of hair growth than the other wavelengths examined and 785 nm also showed a significant effect on hair growth.

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“…Raggi used a 630 nm wavelength to irradiate athletes’ legs intravenously [15]. Mahikara irradiated the superficial temporal artery with CO 2 laser [8]. He concluded that 10 minutes after stopping irradiation, the diameter and blood flow volume of the artery had increased significantly.…”

Section: Discussionmentioning

confidence: 99%

“…The stimulation of the treated region is reported to cause the expansion of blood vessels and an increased blood flow volume. The increase in blood flow is probably caused by the vasodilator reflex via the central nervous system [8]. …”

Section: Introductionmentioning

confidence: 99%

The impact of laser irradiation on global stability in patients with vertebrobasilar insufficiency: A clinical report

et al. 2011

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SummaryBackgroundThe purpose of our experiment was to determine whether laser stimulation can improve microcirculation in the posterior regions of the brain in patients with vertebrobasilar insufficiency (VBI).Material/MethodsWe studied 25 patients (20 female, 5 male, mean age 64) diagnosed with chronic VBI. All were evaluated using the De Klyn test, followed by qualitative assessment of stability using a Berg Balance Scale and evaluation of global stability using an electronic balance platform. A CTL-1100 low power laser was used with standard parameters. We established a protocol for laser irradiation at 5 points along the vertebral artery in the cervical region bilaterally. Irradiation was performed 10 times over two weeks.ResultsSignificant improvement occurred after therapy in headache (p=0.0005), vertigo (p<0.0000), and tinnitus (p=0.0387). No significant differences were observed in nausea or nystagmus caused by head rotation. The Berg Balance Scale results showed significant differences in almost all features. There was a tendency towards improved stability in all parameters, and statistically significant differences in the total surface of support and the spread surface of support for the left foot.ConclusionsLaser stimulation as applied in this study can be useful in the treatment of patients with VBI. The main reason for improvement in global stability, balance, and other VBI symptoms is better blood perfusion.

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Blood Flow Changes of a Superficial Temporal Artery Before and After Low-level Laser Irradiation Applied to the Temporomandibular Joint Area

Abstract: Low-level laser irradiation applied to the right TMJ area caused an expansion of blood vessels and an increase in blood flow volume. The same result on the contralateral side may be caused by the vasodilator reflex via the hypothalamic thermostat.

Cited by 14 publications

References 9 publications

Low‐level laser (light) therapy (LLLT) for treatment of hair loss

Low‐level laser (light) therapy (LLLT) for treatment of hair loss

Evaluation of wavelength-dependent hair growth effects on low-level laser therapy: an experimental animal study

The impact of laser irradiation on global stability in patients with vertebrobasilar insufficiency: A clinical report

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