Clinical Applications of LLLT in Dental and Oral Surgery in the Urawa Clinic

Nagasawa, Akinori; Negishi, Akihide; Kato, Kazuichi

doi:10.5978/islsm.91-or-17

Cited by 10 publications

(5 citation statements)

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“…Recently, various photo-biostimuratory effects of lowpower laser irradiation on regeneration have been reported in skin (1), nerve (2) and skeletal muscle tissues (3,4). In particular, the acceleration of bone regeneration by laser treatment has been a focus of recent research (5)(6)(7)(8)(9)(10). Since induction of bone regeneration is always accompanied by tooth and/or jaw movement with orthodontic treatment, tooth extraction, orthognathic surgery, bone fracture, and stimulation of bone regeneration by laser treatment may be of great potential benefit to shorten the treatment period.…”

Section: Introductionmentioning

confidence: 99%

Pulse irradiation of low-power laser stimulates bone nodule formation.

Ueda

2001

Journal of Oral Science

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Although low-power laser irradiation provides many anabolic effects such as acceleration of bone formation, the effects of different pulse frequencies used during laser irradiation on bone formation have not been elucidated. Osteoblastic cells isolated from fetal rat calvariae were irradiated once with a low-power Ga-Al-As laser (830 nm, 500 mW) in two different irradiation modes; continuous irradiation (CI), and 1 Hz pulsed irradiation (PI). We then investigated the effects on cellular proliferation, bone nodule formation, alkaline phosphatase (ALP) activity, and ALP gene expression. Laser irradiation in both groups significantly stimulated cellular proliferation, bone nodule formation, ALP activity, and ALP gene expression, as compared with the nonirradiation group. Notably, PI markedly stimulated these factors, when compared with the CI group. Since 1 Hz pulsed laser irradiation significantly stimulates bone formation in vitro, it is most likely that pulse frequency is an important factor affecting biological responses in bone formation.

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Section: Introductionmentioning

confidence: 99%

Pulse irradiation of low-power laser stimulates bone nodule formation.

Ueda

2001

Journal of Oral Science

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“…Lirani-Galvao et al investigated the effects of LLLT (GaAlAs laser, 780 nm, 30 mW) on bone repair in rats and noticed a significant increase in osteoblast number [14]. Nagasawa irradiated bone defects with GaAlAs laser and noticed the active formation of spongy bone [15]. Dicker et al showed, through histomorphometry, that applying 10 sessions of LLLT stimulated osteoblastogenesis in bone defects of diabetic rats [9].…”

Section: Discussionmentioning

confidence: 99%

“…Contrary, no differences between groups were noticed during the later investigated period of eight weeks. Pretel et al evaluated bone repair in artificially made rat mandible defects in three evaluation periods (15,45, and 60 days) after stimulation with infrared LLLT [18]. The histological results an advanced bone tissue response compared to the control group, abbreviating the initial inflammatory reaction and promoting rapid new bone matrix formation at 15 and 45 days.…”

Section: Discussionmentioning

confidence: 99%

Low-level laser efficiency in reparation of bone defects

et al. 2023

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Introduction/Objective. Bone resorption is a common problem in dentistry, and bone reparation cannot be easily achieved. Several techniques of bone grafting and the use of low-level laser treatment (LLLT) as a new therapeutic optional recommended for improving bone repair were applied. The aim of the study was to investigate the influence of LLLT in bone repair of artificially made bone defects in the rat mandible using histomorphometry. Methods. The research was carried out on 60 female rats. Bone defects were made in the mandible, and animals were divided into two groups, each containing 30 animals. In the study group, the implantation site was submitted to GaAlAs laser irradiation 670nm, 5 mW, 4 min/per day for 5 days. The control group had no postoperative treatment. Animals were sacrificed after two, six, and eight weeks post LLLT, and preparations were analysed by histomorphometry, determining bone area fraction, bone area, integral density, mean density, and density variation. Results. Histomorphometric analysis revealed statistically higher values of area fraction, area, and integral density in the study group after two and six weeks. However, no beneficial laser effect was noticed after eight weeks. Conclusion. Low-level lasers have a stimulating effect on reparatory mechanisms in the early regeneration stage of artificially made bone defects in the rat mandible and can be used as a useful helping method in bone treatment.

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“…The decreased blood flow during the LLLT session is most likely due to a brief boost to vasoconstriction mediated by transient influence of the autonomic sympathetic system, (6) followed by the period of enhanced parasympathetic control.…”

Section: Discussionmentioning

confidence: 99%

Effects of Diode Laser Irradiation on Superficial Blood Flow in College Sumo Wrestlers: A Preliminary Study

et al. 2005

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Sumo wrestling is a very powerful and competitive contact sport played by extremely fit and highly trained competitors. Due to the extremely competitive nature of the sport and the required training, injuries are common both during training and the actual competition. Long-term lay-up of the competitor has to be avoided in order to maintain the level of muscle tone and mental concentration generated by the grueling training, so postinjury recovery time is kept to a minimum. A noninvasive therapy is therefore required, and the recent interest in the successful application of low level laser therapy (LLLT) in pain attenuation for a large number of pain types suggested that it might offer a new tool for sumo-related injuries. The current trial, with ten sports university sumo wrestlers, examined the effect of LLLT on injuries of the knee (five subjects) and foot (five subjects), using laser speckle flowmetry to assess the possible increase in superficial blood flow which has been associated with both pain attenuation and accelerated wound healing. An 830 nm 60 mW GaAlAs diode LLLT system was applied on one point for 5 min (approximately 15 J/cm 2 ), and laser speckle flowmetry was performed before, during, immediately after, at 30 min and 60 min after irradiation. Decreased blood flow was seen intrairradiation, but an increase, significant in 7 of the 10 subjects was seen immediately postirradiation. This was maintained at significantly elevated levels in 4 subjects, while the remaining six decreased slightly, but in all ten subjects elevated levels of superficial blood flow were seen at one hour postirradiation, compared with preirradiation. LLLT is noninvasive, easy to apply, well tolerated and adverse side effect free. It is suggested that, following further trials to elucidate dosimetry and possible wavelength specificity, LLLT may well offer an exciting new tool to the sports clinician treating injured sumo wrestlers.

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Clinical Applications of LLLT in Dental and Oral Surgery in the Urawa Clinic

Cited by 10 publications

References 0 publications

Pulse irradiation of low-power laser stimulates bone nodule formation.

Pulse irradiation of low-power laser stimulates bone nodule formation.

Low-level laser efficiency in reparation of bone defects

Effects of Diode Laser Irradiation on Superficial Blood Flow in College Sumo Wrestlers: A Preliminary Study

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