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Low-energy Laser Irradiation (low-energy + laser_irradiation)

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Medical Sciences100%

Selected Abstracts

Low-energy laser irradiation accelerates the velocity of tooth movement via stimulation of the alveolar bone remodeling

ORTHODONTICS & CRANIOFACIAL RESEARCH, Issue 4 2009
T Yoshida
Structured Abstract Authors,,, Yoshida T, Yamaguchi M, Utsunomiya T, Kato M, Arai Y, Kaneda T, Yamamoto H, Kasai K Introduction,,, Previously, the authors have reported the acceleration of tooth movement and osteoclastogenesis on the pressure site in an experimental tooth movement model by low-energy laser irradiation (LELI), which stimulated the RANK/RANKL system and c-fms/macrophage colony-stimulating factor system. However, the effect of LELI on osteogenesis on the tension site is not known clearly. Moreover, the temporal changes in alveolar bone during tooth movement have not been investigated as yet. Therefore, the present study was designed to examine the effects of LELI on alveolar bone remodeling during experimental tooth movement, and observe the temporal bone mineral density (BMD) using micro-computed tomography (,CT). Materials and methods,,, To induce experimental tooth movement in rats, 10 g force was applied to the upper right first molar with Nickel titanium closed-coil. Next, a gallium-aluminum-arsenide (Ga-Al-As) diode laser was used to irradiate the area around the moved tooth, and BMD and the amount of tooth movement were measured by ,CT scanning for 21 days. Histopathological examination was also performed. Results,,, The amount of tooth movement in the LELI group was significantly greater than in the non-irradiation group by the end of the experimental period. Further, compared with the non-irradiation group, the fall of BMD was less in the LELI group. Conclusion,,, These findings suggest that LELI accelerates the velocity of tooth movement via stimulation of the alveolar bone remodeling. [source]

Transcranial application of low-energy laser irradiation improves neurological deficits in rats following acute stroke

LASERS IN SURGERY AND MEDICINE, Issue 1 2006
Luis DeTaboada MSEE
Abstract Background and Objectives Low-level laser therapy (LLLT) has been shown to have beneficial effects on ischemic skeletal and heart muscles tissues. The aim of the present study was to approve the effectiveness of LLLT treatment at different locations on the brain in acute stroked rats. Study Design/Materials and Methods Stroke was induced in 169 rats that were divided into four groups: control non-laser and three laser-treated groups where laser was employed ipsilateral, contralateral, and both to the side of the induced stroke. Rats were tested for neurological function. Results In all three laser-treated groups, a marked and significant improvement in neurological deficits was evident at 14, 21, and 28 days post stroke relative to the non-treated group. Conclusions These observations suggest that LLLT applied at different locations in the skull and in a rather delayed-phase post stroke effectively improves neurological function after acute stroke in rats. Lasers Surg. Med. 38:70,73, 2006. © 2006 Wiley-Liss, Inc. [source]

Attenuation of infarct size in rats and dogs after myocardial infarction by low-energy laser irradiation

LASERS IN SURGERY AND MEDICINE, Issue 3 2001
Uri Oron PhD
Abstract Background and Objective The aim of the present study was to investigate the possibility that low-energy laser irradiation attenuates infarct size formation after induction of chronic myocardial infarction (MI) in small and large experimental animals. Study Design/Materials and Methods Laser irradiation was applied to the infarcted area of rats and dogs at various power densities (2.5 to 20 mW/cm2) after occlusion of the coronary artery. Results In infarcted laser-irradiated rats that received laser irradiation immediately and 3 days after MI at energy densities of 2.5, 6, and 20 mW/cm2, there was a 14%, 62% (significant; P,<,0.05), and 2.8% reduction of infarct size (14 days after MI) relative to non,laser-irradiated rats, respectively. In dogs, a 49% (significant; P,<,0.01) reduction of infarct size was achieved. Conclusion The results of the present study indicate that delivery of low-energy laser irradiation to infarcted myocardium in rats and dogs has a profound effect on the infarct size after MI. Lasers Surg. Med. 28:204,211, 2001. © 2001 Wiley-Liss, Inc. [source]

Low-energy laser irradiation accelerates the velocity of tooth movement via stimulation of the alveolar bone remodeling

ORTHODONTICS & CRANIOFACIAL RESEARCH, Issue 4 2009
T Yoshida
Structured Abstract Authors,,, Yoshida T, Yamaguchi M, Utsunomiya T, Kato M, Arai Y, Kaneda T, Yamamoto H, Kasai K Introduction,,, Previously, the authors have reported the acceleration of tooth movement and osteoclastogenesis on the pressure site in an experimental tooth movement model by low-energy laser irradiation (LELI), which stimulated the RANK/RANKL system and c-fms/macrophage colony-stimulating factor system. However, the effect of LELI on osteogenesis on the tension site is not known clearly. Moreover, the temporal changes in alveolar bone during tooth movement have not been investigated as yet. Therefore, the present study was designed to examine the effects of LELI on alveolar bone remodeling during experimental tooth movement, and observe the temporal bone mineral density (BMD) using micro-computed tomography (,CT). Materials and methods,,, To induce experimental tooth movement in rats, 10 g force was applied to the upper right first molar with Nickel titanium closed-coil. Next, a gallium-aluminum-arsenide (Ga-Al-As) diode laser was used to irradiate the area around the moved tooth, and BMD and the amount of tooth movement were measured by ,CT scanning for 21 days. Histopathological examination was also performed. Results,,, The amount of tooth movement in the LELI group was significantly greater than in the non-irradiation group by the end of the experimental period. Further, compared with the non-irradiation group, the fall of BMD was less in the LELI group. Conclusion,,, These findings suggest that LELI accelerates the velocity of tooth movement via stimulation of the alveolar bone remodeling. [source]

Low-energy laser stimulates tooth movement velocity via expression of RANK and RANKL

ORTHODONTICS & CRANIOFACIAL RESEARCH, Issue 3 2008
S Fujita
Structured Abstract Authors,,, Fujita S, Yamaguchi M, Utsunomiya T, Yamamoto H, Kasai K Objective,,, Recent studies have demonstrated that low-energy laser irradiation stimulates bone formation in vitro and in vivo. However, very little is known about the effects of laser irradiation on osteoclastogenesis. The receptor activator of the nuclear factor- kB (RANK),/,RANK ligand (RANKL),/,osteoprotegerin (OPG) system is essential and sufficient for osteoclastogenesis. The present study was designed to examine the effects of low-energy laser irradiation on expressions of RANK, RANKL, and OPG during experimental tooth movement. Design,,, To induce experimental tooth movement in rats, 10 g of orthodontic force was applied to the molars. Next, a Ga,Al,As diode laser was used to irradiate the area around the moved tooth and the amount of tooth movement was measured for 7 days. Immunohistochemical staining with RANK, RANKL, and OPG was performed. Real time PCR was also performed to elucidate the expression of RANK in irradiated rat osteoclast precursor cells in vitro. Results,,, In the irradiation group, the amount of tooth movement was significantly greater than in the non-irradiation group by the end of the experimental period. Cells that showed positive immunoreactions to the primary antibodies of RANKL and RANK were significantly increased in the irradiation group on day 2 and 3, compared with the non-irradiation group. In contrast, the expression of OPG was not changed. Further, RANK expression in osteoclast precursor cells was detected at an early stage (day 2 and 3) in the irradiation group. Conclusion,,, These findings suggest that low-energy laser irradiation stimulates the velocity of tooth movement via induction of RANK and RANKL. [source]