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Long-term evaluation of the effect of low-level laser therapy on orthodontic miniscrew stability and peri-implant gingival condition: A randomized clinical trial. J World Fed Orthod 2017. [DOI: 10.1016/j.ejwf.2017.08.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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52
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Marques NCT, Neto NL, Prado MTO, Vitor LLR, Oliveira RC, Sakai VT, Santos CF, Machado MAAM, Oliveira TM. Effects of PBM in different energy densities and irradiance on maintaining cell viability and proliferation of pulp fibroblasts from human primary teeth. Lasers Med Sci 2017; 32:1621-1628. [DOI: 10.1007/s10103-017-2301-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 08/03/2017] [Indexed: 02/06/2023]
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53
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Ateş GB, Ak A, Garipcan B, Gülsoy M. Methylene blue mediated photobiomodulation on human osteoblast cells. Lasers Med Sci 2017; 32:1847-1855. [PMID: 28776111 DOI: 10.1007/s10103-017-2286-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Accepted: 07/12/2017] [Indexed: 11/28/2022]
Abstract
Photobiomodulation (PBM) and photodynamic therapy (PDT) are two major methods, which use light in medicine and dentistry. PBM uses low-level laser light to induce cell proliferation and activity. In contrast, PDT use laser light combined with a photosensitizer (PS) to cause cell death. Due to similar, not fully understood mechanisms and biphasic response of light, unexpected and complex outcomes may be observed. In the present study, the effect of 635 nm laser light, with power density 50 mW/cm2, at three different energy densities (0.5, 1, and 2 J/cm2 which last 10, 20, and 40 s, respectively) mediated by methylene blue (MB) on the human osteoblast cell line (ATCC-CRL-11372, Rockville, MD, USA) was investigated. Cell viability (MTT assay and acridine orange/propidium iodide staining) and proliferation (Alamar Blue assay) were assessed at 24, 48, and 72 h post irradiation. Alkaline phosphatase (ALP) activity, mineralization (Alizarin Red staining) and gene expressions (RT-PCR analysis) were analyzed at 7th and 14th days after treatment. Five groups were formed as the control group (no MB, no irradiation), MB (only 0.05 μM MB), MB + 0.5 J/cm2, MB + 1 J/cm2, and MB + 2 J/cm2. Cell viability was decreased at 72 h (ANOVA; p < 0.05) for MB + 0.5 J/cm2, MB + 1 J/cm2, and MB + 2 J/cm2 groups. Although proliferation does not seem to be effected by MB-mediated laser application, osteo-anabolic activity is altered. ALP activity was significantly increased at day 7 (ANOVA; p < 0.05) for MB-combined laser groups; on the other hand, mineralization was significantly decreased (ANOVA; p < 0.05) in all treatment groups. Alkaline phosphatase and collagen-I expressions were upregulated in MB + 2 J/cm2 group at 7th and 14th days, respectively. These results may contribute to the low-dose PDT researches and understanding PBM effects on osteoblast behavior but further studies are needed since inappropriate conditions may lead to undesirable results for both therapies.
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Affiliation(s)
- Gamze Bölükbaşı Ateş
- Institute of Biomedical Engineering, Bogazici University, Uskudar, 34684, Istanbul, Turkey.
| | - Ayşe Ak
- Engineering Faculty, Biomedical Engineering, Erzincan University, 24100, Erzincan, Turkey
| | - Bora Garipcan
- Institute of Biomedical Engineering, Bogazici University, Uskudar, 34684, Istanbul, Turkey
| | - Murat Gülsoy
- Institute of Biomedical Engineering, Bogazici University, Uskudar, 34684, Istanbul, Turkey
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Milligan M, Arudchelvan Y, Gong SG. Effects of two wattages of low-level laser therapy on orthodontic tooth movement. Arch Oral Biol 2017; 80:62-68. [DOI: 10.1016/j.archoralbio.2017.03.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 03/21/2017] [Accepted: 03/23/2017] [Indexed: 01/01/2023]
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55
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Oliveira FAD, Matos AA, Matsuda SS, Buzalaf MAR, Bagnato VS, Machado MADAM, Damante CA, Oliveira RCD, Peres-Buzalaf C. Low level laser therapy modulates viability, alkaline phosphatase and matrix metalloproteinase-2 activities of osteoblasts. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 169:35-40. [PMID: 28264787 DOI: 10.1016/j.jphotobiol.2017.02.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 02/26/2017] [Indexed: 11/26/2022]
Abstract
Low level laser therapy (LLLT) has been shown to stimulate bone cell metabolism but their impact on the matrix metalloproteinase (MMP) expression and activity is little explored. This study evaluated the influence of LLLT at two different wavelengths, red and infrared, on MC3T3-E1 preosteoblast viability, alkaline phosphatase (ALP) and MMP-2 and -9 activities. To accomplish this, MC3T3-E1 cells were irradiated with a punctual application of either red (660nm; InGaAIP active medium) or infrared (780nm; GaAlAs active medium) lasers both at a potency of 20mW, energy dose of 0.08 or 0.16J, and energy density of 1.9J/cm2 or 3.8J/cm2, respectively. The control group received no irradiation. Cellular viability, ALP and MMP-2 and -9 activities were assessed by MTT assay, enzymatic activity and zymography, respectively, at 24, 48 and 72h. The treatment of cells with both red and infrared lasers significantly increased the cellular viability compared to the non-irradiated control group at 24 and 48h. The ALP activity was also up modulated in infrared groups at 24 and 72h, depending on the energy densities. In addition, the irradiation with red laser at the energy density of 1.9J/cm2 promoted an enhancement of MMP-2 activity at 48 and 72h. However, no differences were observed for the MMP-9 activity. In conclusion, when used at these specific parameters, LLL modulates both preosteoblast viability and differentiation highlighted by the increased ALP and MMP-2 activities induced by irradiation.
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Affiliation(s)
- Flávia Amadeu de Oliveira
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | - Adriana Arruda Matos
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | - Sandra Satiko Matsuda
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | | | - Vanderley Salvador Bagnato
- Departamento de Física e Ciência dos Materiais, Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil
| | | | - Carla Andreotti Damante
- Department of Prosthodontics/Periodontics, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | | | - Camila Peres-Buzalaf
- Universidade do Sagrado Coração, Pró-Reitoria de Pesquisa e Pós-Graduação, Bauru, SP, Brazil
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56
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Vitse J, Bekara F, Byun S, Herlin C, Teot L. A Double-Blind, Placebo-Controlled Randomized Evaluation of the Effect of Low-Level Laser Therapy on Venous Leg Ulcers. INT J LOW EXTR WOUND 2017; 16:29-35. [DOI: 10.1177/1534734617690948] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This study aimed to determine the effect of low-level laser therapy (LLLT) on chronic venous leg ulcers (VLUs). A double-blinded prospective randomized controlled trial was conducted to compare incidence of complete wound closure, ulcer size and pain reduction in patients randomized to 24 treatments of placebo or LLLT (635 nm) over 12 weeks. Patients presented with a 6-week history of VLUs ranging in size from 5 to 20 cm2. Venous origin was confirmed by Doppler ultrasound and an ankle brachial index of 0.8 or greater. Of 24 patients, 23% of the test group (n = 13) and 18% of placebo group (n = 11) achieved complete wound closure. At 12 weeks, patients in test and placebo groups had a mean surface area reduction of 6.26 cm2 ( P < .0001) and 6.72 cm2 ( P < .005), respectively, and a mean pain score decrease of 43.54 points ( P < .0001) and 25.73 points ( P = .002) respectively. Differences between groups was not statistically significant for wound closure ( P = 1.0) or ulcer size ( P = .80). Mean ulcer pain was significantly reduced from initiation of treatment compared with 4 weeks’ follow-up after 12 weeks with LLLT ( P < .01). Within the limitations of the study, LLLT may not have early effects as an adjunctive therapy to wound healing of VLUs, but LLLT may have delayed effects on VLU healing and associated pain, which requires further study.
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Affiliation(s)
- Julian Vitse
- Montpellier University Hospital, Montpellier, France
| | - Farid Bekara
- Division of Plastic and Reconstructive Surgery, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Stephanie Byun
- Division of Plastic and Reconstructive Surgery, Dalhousie University, Halifax, Nova Scotia, Canada
| | | | - Luc Teot
- Montpellier University Hospital, Montpellier, France
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Bölükbaşı Ateş G, Ak Can A, Gülsoy M. Investigation of photobiomodulation potentiality by 635 and 809 nm lasers on human osteoblasts. Lasers Med Sci 2017; 32:591-599. [PMID: 28116535 DOI: 10.1007/s10103-017-2153-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 01/12/2017] [Indexed: 01/10/2023]
Abstract
Photobiomodulation (PBM) describes light-induced photochemical reactions achieved by the application of red or near infrared lasers/LED light with low energy densities. This noninvasive and painless method has been used in some clinical areas but controversial outcomes demand a skeptical look for its promising and potential effects. In this detailed in vitro study, the osteoblast cells were irradiated with 635 and 809 nm diode lasers at energy densities of 0.5, 1, and 2 J/cm2. Cell viability, proliferation, bone formation, and osteoblast differentiation were evaluated by methylthiazole tetrazolium (MTT) assay, Alamar Blue assay, acridine orange/propidium iodide staining, alkaline phosphatase (ALP) activity, Alizarin red staining, and reverse-transcription polymerase chain reaction (RT-PCR) to test the expression of collagen type I, ALPL, and osteocalcin. The results indicate that studied energy doses have a transient effect (48 h after laser irradiation) on the osteoblast viability and proliferation. Similarly, laser irradiation did not appear to have any effect on ALP activity. These results were confirmed by RT-PCR analysis of osteoblast markers. This study suggests that several irradiation parameters and variations in the methods should be clearly established in the laboratory before laser treatment becomes a postulated application for bone tissue regeneration in clinical level.
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Affiliation(s)
- Gamze Bölükbaşı Ateş
- Institute of Biomedical Engineering, Bogazici University, Uskudar, Istanbul, Turkey, 34684.
| | - Ayşe Ak Can
- Engineering Faculty, Biomedical Engineering, Erzincan University, Erzincan, Turkey, 24100
| | - Murat Gülsoy
- Institute of Biomedical Engineering, Bogazici University, Uskudar, Istanbul, Turkey, 34684
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Photodynamic therapy using chloro-aluminum phthalocyanine decreases inflammatory response in an experimental rat periodontal disease model. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 167:208-215. [PMID: 28086121 DOI: 10.1016/j.jphotobiol.2016.12.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 12/22/2016] [Indexed: 11/21/2022]
Abstract
BACKGROUND AND OBJECTIVE Emerging evidence suggests that photodynamic therapy (PDT) can exhibit immunomodulatory activity. The purpose of the present study was to analyse cytokine profiles after application of PDT in gingival tissues of rats with ligature-induced periodontal disease (PD). STUDY DESIGN/MATERIAL AND METHODS Periodontal disease was induced through the introduction of a cotton thread around the first left mandibular molar, while the right side molars did not receive ligatures. After 7days of PD evolution, ligatures were removed from the left side, and the animals were randomically divided into the following treatment groups: I, rats without treatment; II, rats received chloro-aluminum phthalocyanine (AlClPc); III, rats received low-level laser alone; and IV, rats received AlClPc associated with low-level laser (PDT). The animals were killed 7days after the treatments, and the mandibles were histologically processed to assess morphological and immunohistochemical profile, while gingival tissues were removed for quantification of tumor necrosis factor (TNF)-α, interleukin (IL-)1β and IL-10 expression (by ELISA). RESULTS Histomorphological analysis of periodontal tissues demonstrated that PDT-treated animals show tissue necrosis, as well as lower TNF- α expression, compared to ligatured animals treated with AlClPc alone. CONCLUSIONS It was concluded that PDT using AlClPc entrapped in a lipid nanoemulsion may be useful in therapies, because of immunomodulatory effects that decreased the inflammatory response and cause tissue destruction.
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Aoki A, Mizutani K, Schwarz F, Sculean A, Yukna RA, Takasaki AA, Romanos GE, Taniguchi Y, Sasaki KM, Zeredo JL, Koshy G, Coluzzi DJ, White JM, Abiko Y, Ishikawa I, Izumi Y. Periodontal and peri-implant wound healing following laser therapy. Periodontol 2000 2017; 68:217-69. [PMID: 25867988 DOI: 10.1111/prd.12080] [Citation(s) in RCA: 195] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/07/2014] [Indexed: 12/18/2022]
Abstract
Laser irradiation has numerous favorable characteristics, such as ablation or vaporization, hemostasis, biostimulation (photobiomodulation) and microbial inhibition and destruction, which induce various beneficial therapeutic effects and biological responses. Therefore, the use of lasers is considered effective and suitable for treating a variety of inflammatory and infectious oral conditions. The CO2 , neodymium-doped yttrium-aluminium-garnet (Nd:YAG) and diode lasers have mainly been used for periodontal soft-tissue management. With development of the erbium-doped yttrium-aluminium-garnet (Er:YAG) and erbium, chromium-doped yttrium-scandium-gallium-garnet (Er,Cr:YSGG) lasers, which can be applied not only on soft tissues but also on dental hard tissues, the application of lasers dramatically expanded from periodontal soft-tissue management to hard-tissue treatment. Currently, various periodontal tissues (such as gingiva, tooth roots and bone tissue), as well as titanium implant surfaces, can be treated with lasers, and a variety of dental laser systems are being employed for the management of periodontal and peri-implant diseases. In periodontics, mechanical therapy has conventionally been the mainstream of treatment; however, complete bacterial eradication and/or optimal wound healing may not be necessarily achieved with conventional mechanical therapy alone. Consequently, in addition to chemotherapy consisting of antibiotics and anti-inflammatory agents, phototherapy using lasers and light-emitting diodes has been gradually integrated with mechanical therapy to enhance subsequent wound healing by achieving thorough debridement, decontamination and tissue stimulation. With increasing evidence of benefits, therapies with low- and high-level lasers play an important role in wound healing/tissue regeneration in the treatment of periodontal and peri-implant diseases. This article discusses the outcomes of laser therapy in soft-tissue management, periodontal nonsurgical and surgical treatment, osseous surgery and peri-implant treatment, focusing on postoperative wound healing of periodontal and peri-implant tissues, based on scientific evidence from currently available basic and clinical studies, as well as on case reports.
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60
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Massotti FP, Gomes FV, Mayer L, de Oliveira MG, Baraldi CE, Ponzoni D, Puricelli E. Histomorphometric assessment of the influence of low-level laser therapy on peri-implant tissue healing in the rabbit mandible. Photomed Laser Surg 2017; 33:123-8. [PMID: 25751666 DOI: 10.1089/pho.2014.3792] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE The purpose of this study was to demonstrate the effect of low-level laser therapy (LLLT) on the peri-implant bone healing process in the rabbit mandible. BACKGROUND DATA LLLT has been shown to accelerate tissue repair and osseointegration of implants placed into the rabbit tibia. However, the beneficial effects of LLLT have never been tested in the rabbit mandible, which would more closely mimic the human situation. MATERIALS AND METHODS Twenty-four male New Zealand rabbits were randomly divided into four groups of six animals each. All animals had their left mandibular incisors extracted, followed by immediate insertion of a titanium dental implant in the fresh socket. Three groups received LLLT [aluminum-gallium-arsenide (AlGaAs), λ=830nm, 50 mW, continuous wave (CW)] at three different energy densities per treatment session (E-5, 5 J/cm(2); E-10, 10 J/cm(2); and E-20, 20 J/cm(2)). Irradiation was performed every 48 h for 13 days, totaling seven sessions. One group received sham treatment (controls). Histological sections were obtained from each of the 24 mandibles dissected, without first decalcifying the specimens, and were stained with hematoxylin and eosin and Picrosirius red for histomorphometric evaluation. Bone-to-implant contact (BIC), bone formation area, and collagen fiber area were assessed by light microscopy. RESULTS Significant differences were found between group E-20 and all other groups (p<0.05). Histomorphometric evaluation showed significantly higher BIC and significantly more collagen fibers in group E-20. CONCLUSIONS Photobiostimulation with LLLT at an energy density of 20 J/cm(2) per session had a significant positive effect on new bone formation around dental implants inserted in the rabbit mandible.
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Affiliation(s)
- Fabrício Poletto Massotti
- 1 Department of Oral and Maxillofacial Surgery, Hospital de Clínicas de Porto Alegre, School of Dentistry, Universidade Federal do Rio Grande do Sul , Porto Alegre, RS, Brazil
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61
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Effects of low-level laser irradiation on human blood lymphocytes in vitro. Lasers Med Sci 2017; 32:405-411. [DOI: 10.1007/s10103-016-2134-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 12/21/2016] [Indexed: 10/20/2022]
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62
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Eslami H, Motahari P, Safari E, Seyyedi M. Evaluation effect of low level Helium-Neon laser and Iranian propolis extract on Collagen Type I gene expression by human gingival fibroblasts: an in vitro study. Laser Ther 2017; 26:105-112. [PMID: 28785130 DOI: 10.5978/islsm.17-or-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 01/27/2017] [Indexed: 11/06/2022]
Abstract
BACK GROUND AND AIM production of collagen by fibroblast cells is a key component in wound healing. Several studies have shown that low level laser therapy (LLLT) and propolis extract stimulate collagen Type I production. The aim of this study is to evaluation the combined effect of LLL helium neon (632.8 nm) and Iranian propolis extract on collagen Type I gene expression by human gingival fibroblasts (HGF3-PI 53). METHODS AND MATERIALS Human gingival fibroblasts after culturing divided into six experimental groups: G1-control group, which received no irradiation and propolis extract, G2-irradiated at1.5 J/cm2, G3-irradiated at 0.15 J/cm2, G4-recived extract of propolis, G5- combined extract of propolis and 1.5 J/cm2 laser irradiation and G6- combined extract of propolis and 0.15 J/cm2 laser irradiation. The experiments were conducted in triplicate. After 24 hour, the total RNA was extracted and cDNA synthesis was performed. Type I collagen mRNA expression was determined with real time PCR. RESULTS The obtained results illustrated a statistically significant difference between G3 (0.15 J/cm2) and G1 (control group) in levels of collagen Type I messenger RNA (mRNA) expression (p<0.05). The irradiated cells showed a 1.4 times increase in mRNA expression of the collagen Type I gene. Expression of this gene decreases in other groups that this difference was statistically significant. CONCLUSION LLLT in different dosage and propolis extract may result in decreased or increased collagen type I gene expression. However this effect should be investigated in clinical studies.
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Affiliation(s)
- Hosein Eslami
- Assistant Professor , Department of Oral Medicine, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, IR Iran
| | - Paria Motahari
- Post graduate student. Department of Oral Medicine, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, IR Iran
| | - Ebrahim Safari
- Associate Professor of Physic, Department of atomic and molecular Physics, Faculty of physics university of Tabriz, IR Iran
| | - Maryam Seyyedi
- PhD student of microbiology, tuberculosis and lung disease research center, Tabriz University of medical science, Tabriz, Iran
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63
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Fernandes AP, Junqueira MDA, Marques NCT, Machado MAAM, Santos CF, Oliveira TM, Sakai VT. Effects of low-level laser therapy on stem cells from human exfoliated deciduous teeth. J Appl Oral Sci 2016; 24:332-7. [PMID: 27556203 PMCID: PMC4990361 DOI: 10.1590/1678-775720150275] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Accepted: 03/01/2016] [Indexed: 12/13/2022] Open
Abstract
Low-Level Laser Therapy stimulates the proliferation of a variety of types of cells. However, very little is known about its effect on stem cells from human exfoliated deciduous teeth (SHED).
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Affiliation(s)
- Ana Paula Fernandes
- - Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Odontopediatria, Ortodontia e Saúde Coletiva, Bauru, SP, Brasil
| | | | - Nádia Carolina Teixeira Marques
- - Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Odontopediatria, Ortodontia e Saúde Coletiva, Bauru, SP, Brasil
| | | | - Carlos Ferreira Santos
- - Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Ciências Biológicas, Bauru, SP, Brasil
| | - Thais Marchini Oliveira
- - Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Odontopediatria, Ortodontia e Saúde Coletiva, Bauru, SP, Brasil
| | - Vivien Thiemy Sakai
- - Universidade Federal de Alfenas, Departamento de Clínica e Cirurgia, Alfenas, MG, Brasil
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Moura-Netto C, Ferreira LS, Maranduba CM, Mello-Moura ACV, Marques MM. Low-intensity laser phototherapy enhances the proliferation of dental pulp stem cells under nutritional deficiency. Braz Oral Res 2016; 30:S1806-83242016000100265. [PMID: 27253140 DOI: 10.1590/1807-3107bor-2016.vol30.0080] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Accepted: 03/16/2016] [Indexed: 01/28/2023] Open
Abstract
Dental trauma in immature permanent teeth can damage pulp vascularization, which leads to necrosis and cessation of apexogenesis. Studies on tissue engineering using stem cells from human exfoliated deciduous teeth (SHEDs) have yielded promising results. Laser phototherapy (LPT) is able to influence the proliferation and differentiation of these cells, which could improve tissue engineering. SHEDs (eighth passage) were seeded into 96-well culture plates (103 cells/well) and were grown in culture medium supplemented with 15% defined fetal bovine serum (FBS) for 12 h. After determining the appropriate nutrition deficiency status (5% FBS), the cells were assigned into four groups: 1) G1 - 15% FBS (positive control); 2) G2 - 5% FBS (negative control); 3) G3 - 5% FBS+LPT 3 J/cm2; and 4) G4 - 5% FBS+LPT 5 J/cm2. For the LPT groups, two laser irradiations at 6 h intervals were performed using a continuous wave InGaAlP diode laser (660 nm, with a spot size of 0.028 cm2, 10 mW) in punctual and contact mode. Cell viability was assessed via an MTT reduction assay immediately after the second laser irradiation (0 h) and 24, 48, and 72 h later. We found that G3 and G4 presented a significantly higher cell growth rate when compared with G2 (p < 0.01). Moreover, G4 exhibited a similar cell growth rate as G1 throughout the entire experiment (p > 0.05). These findings indicate that LPT with 5 J/cm2 can enhance the growth of SHEDs during situations of nutritional deficiency. Therefore, LPT could be a valuable adjunct treatment in tissue engineering when using stem cells derived from the dental pulp of primary teeth.
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Affiliation(s)
- Cacio Moura-Netto
- Universidade Cruzeiro do Sul, Universidade Cruzeiro do Sul, School of Dentistry, São Paulo SP , Brazil, Universidade Cruzeiro do Sul, School of Dentistry, São Paulo, SP, Brazil
| | - Leila Soares Ferreira
- Universidade Ibirapuera, Universidade Ibirapuera, School of Dentistry, São Paulo SP , Brazil, Universidade Ibirapuera, School of Dentistry, São Paulo, SP, Brazil
| | - Carlos Magno Maranduba
- Universidade Federal de Juiz de Fora, Universidade Federal de Juiz de Fora, Institute of Biological Sciences, Department of Biology, Juiz de Fora MG , Brazil, Universidade Federal de Juiz de Fora, Institute of Biological Sciences, Department of Biology, Juiz de Fora, MG, Brazil
| | - Anna Carolina Volpi Mello-Moura
- Universidade Ibirapuera, Universidade Ibirapuera, School of Dentistry, São Paulo SP , Brazil, Universidade Ibirapuera, School of Dentistry, São Paulo, SP, Brazil
| | - Marcia Martins Marques
- Universidade de São Paulo, Universidade de São Paulo, School of Dentistry, Department of Restorative Dentistry, São Paulo SP , Brazil, Universidade de São Paulo (USP), School of Dentistry, Department of Restorative Dentistry, São Paulo, SP, Brazil
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Laser photobiomodulation (830 and 660 nm) in mast cells, VEGF, FGF, and CD34 of the musculocutaneous flap in rats submitted to nicotine. Lasers Med Sci 2016; 32:335-341. [PMID: 27913969 DOI: 10.1007/s10103-016-2118-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 11/22/2016] [Indexed: 12/20/2022]
Abstract
The aim of this study was to investigate the effect of laser photobiomodulation (PBM) on the viability of the transverse rectus abdominis musculocutaneous (TRAM) flap in rats subjected to the action of nicotine. We evaluated 60 albino Wistar rats, divided into six groups of ten animals. Group 1 (saline) underwent the surgical technique to obtain a TRAM flap; group 2 (laser 830 nm) underwent the surgical technique and was irradiated with a laser 830 nm; group 3 (laser 660 nm) underwent the surgical technique and was irradiated with a laser 660 nm; group 4 was treated with nicotine subcutaneously (2 mg/kg/2×/day/4 weeks) and underwent surgery; group 5 (nicotine + laser 830 nm) was exposed to nicotine, underwent the surgical technique, and was irradiated with a laser 830 nm; group 6 (nicotine + laser 660 nm) was exposed to nicotine, underwent the surgical technique, and was irradiated with a laser 660 nm. The application of PBM occurred immediately after surgery and on the two following days. The percentage of necrosis was assessed using the AxioVision® software. The number of mast cells (toluidine blue staining) was evaluated, and immunohistochemistry was performed to detect vascular endothelial growth factor expression (anti-VEGF-A), fibroblasts (anti-basic FGF), and neoformed vessels (anti-CD34). PBM with a wavelength of 830 nm increased the viability of the TRAM flap, with a smaller area of necrosis, increased number of mast cells, and higher expression of VEGF and CD34. PBM increases the viability of musculocutaneous flaps treated with to nicotine.
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Ramos Silva C, Cabral FV, de Camargo CFM, Núñez SC, Mateus Yoshimura T, de Lima Luna AC, Maria DA, Ribeiro MS. Exploring the effects of low-level laser therapy on fibroblasts and tumor cells following gamma radiation exposure. JOURNAL OF BIOPHOTONICS 2016; 9:1157-1166. [PMID: 27322660 DOI: 10.1002/jbio.201600107] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 04/18/2016] [Indexed: 06/06/2023]
Abstract
Ionizing radiation (IR) induces DNA damage and low-level laser therapy (LLLT) has been investigated to prevent or repair detrimental outcomes resulting from IR exposure. Few in vitro studies, however, explore the biological mechanisms underlying those LLLT benefits. Thus, in this work, fibroblasts and tumor cells are submitted to IR with doses of 2.5 Gy and 10 Gy. After twenty-four-h, the cells are exposed to LLLT with fluences of 30 J cm-2 , 90 J cm-2 , and 150 J cm-2 . Cellular viability, cell cycle phases, cell proliferation index and senescence are evaluated on days 1 and 4 after LLLT irradiation. For fibroblasts, LLLT promotes - in a fluence-dependent manner - increments in cell viability and proliferation, while a reduction in the senescence was observed. Regarding tumor cells, no influences of LLLT on cell viability are noticed. Whereas LLLT enhances cell populations in S and G2 /M cell cycle phases for both cellular lines, a decrease in proliferation and increase in senescence was verified only for tumor cells. Putting together, the results suggest that fibroblasts and tumor cells present different responses to LLLT following exposure to gamma-radiation, and these promising results should stimulate further investigations. Senescence of tumor cells and fibroblasts on the 4th day after ionizing radiation (IR) and low-level laser therapy (LLLT) exposures. The number of senescent cells increased significantly for tumor cells (a) while for fibroblasts no increment was observed (b). The blue collor indicates senescence activity.
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Affiliation(s)
- Camila Ramos Silva
- Nuclear Technology Postgraduate Program, University of Sao Paulo, Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, Brazil
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
| | - Fernanda Viana Cabral
- Nuclear Technology Postgraduate Program, University of Sao Paulo, Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, Brazil
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
| | - Claudinei Francisco Morais de Camargo
- Nuclear Technology Postgraduate Program, University of Sao Paulo, Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, Brazil
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
| | - Silvia Cristina Núñez
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
| | - Tania Mateus Yoshimura
- Nuclear Technology Postgraduate Program, University of Sao Paulo, Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, Brazil
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
| | - Arthur Cássio de Lima Luna
- Biochemistry and Biophysical Laboratory, Butantan Institute, Av. Vital Brazil, 1500, São Paulo, 05503-900, Brazil
- Medical School, University of Sao Paulo, Av. Dr. Arnaldo, 455, 01246-903, São Paulo, Brazil
| | - Durvanei Augusto Maria
- Biochemistry and Biophysical Laboratory, Butantan Institute, Av. Vital Brazil, 1500, São Paulo, 05503-900, Brazil
- Medical School, University of Sao Paulo, Av. Dr. Arnaldo, 455, 01246-903, São Paulo, Brazil
| | - Martha Simões Ribeiro
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
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Shin SH, Kim KH, Choi NR, Kim IR, Park BS, Kim YD, Kim UK, Kim CH. Effect of low-level laser therapy on bisphosphonate-treated osteoblasts. Maxillofac Plast Reconstr Surg 2016; 38:48. [PMID: 27995121 PMCID: PMC5122599 DOI: 10.1186/s40902-016-0095-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 10/31/2016] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND This study investigates the effect of alendronate-treated osteoblasts, as well as the effect of low-level laser therapy (LLLT) on the alendronate-treated osteoblasts. Bisphosphonate decreases the osteoblastic activity. Various treatment modalities are used to enhance the bisphosphonate-treated osteoblasts; however, there were no cell culture studies conducted using a low-level laser. METHODS Human fetal osteoblastic (hFOB 1.19) cells were treated with 50 μM alendronate. Then, they were irradiated with a 1.2 J/cm2 low-level Ga-Al-As laser (λ = 808 ± 3 nm, 80 mW, and 80 mA; spot size, 1 cm2; NDLux, Seoul, Korea). The cell survivability was measured with the MTT assay. The three cytokines of osteoblasts, receptor activator of nuclear factor κB ligand (RANKL), osteoprotegerin (OPG), and macrophage colony-stimulating factor (M-CSF) were analyzed. RESULTS In the cells treated with alendronate at concentrations of 50 μM and higher, cell survivability significantly decreased after 48 h (p < 0.05). After the applications of low-level laser on alendronate-treated cells, cell survivability significantly increased at 72 h (p < 0.05). The expressions of OPG, RANKL, and M-CSF have decreased via the alendronate. The RANKL and M-CSF expressions have increased, but the OPG was not significantly affected by the LLLT. CONCLUSIONS The LLLT does not affect the OPG expression in the hFOB cell line, but it may increase the RANKL and M-CSF expressions, thereby resulting in positive effects on osteoclastogenesis and bone remodeling.
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Affiliation(s)
- Sang-Hun Shin
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Beomeo, Mulgeum, Yangsan, 626-770 Republic of Korea
| | - Ki-Hyun Kim
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Beomeo, Mulgeum, Yangsan, 626-770 Republic of Korea
| | - Na-Rae Choi
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Beomeo, Mulgeum, Yangsan, 626-770 Republic of Korea
| | - In-Ryoung Kim
- Department of Oral Anatomy and Cell Biology, School of Dentistry, Pusan National University, Beomeo, Mulgeum, Yangsan, 626-770 Republic of Korea
| | - Bong-Soo Park
- Department of Oral Anatomy and Cell Biology, School of Dentistry, Pusan National University, Beomeo, Mulgeum, Yangsan, 626-770 Republic of Korea
| | - Yong-Deok Kim
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Beomeo, Mulgeum, Yangsan, 626-770 Republic of Korea
| | - Uk-Kyu Kim
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Beomeo, Mulgeum, Yangsan, 626-770 Republic of Korea
| | - Cheol-Hun Kim
- Department of Oral and Maxillofacial Surgery, Dentistry, Dong-A Medical Center, 602-715 Pusan, Republic of Korea
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Maman Fracher Abramoff M, Pereira MD, de Seixas Alves MT, Segreto RA, Guilherme A, Ferreira LM. Low-level laser therapy on bone repair of rat tibiae exposed to ionizing radiation. Photomed Laser Surg 2016; 32:618-26. [PMID: 25372454 DOI: 10.1089/pho.2013.3692] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE The purpose of this study was to evaluate the effects of low-level laser therapy (LLLT) on the repair of rat tibiae exposed to ionizing radiation (IR). BACKGROUND DATA IR causes structural changes that delay bone tissue repair. Properly dosed, LLLT improves the bone repair process. METHODS Seventy-two healthy Wistar rats were distributed into the following groups: Group I, sham control; Group II, LLLT; Group III, IR; and Group IV, IR and LLLT. Groups III and IV received a single dose (30 Gy) of gamma radiation and underwent surgery 28 days later. A noncritical sized bone defect (diameter 2.5 mm) was surgically created in all groups. Groups II and IV received three applications of postsurgical LLLT (GaAlAs, 808 nm, 100 mW, 0.028 cm(2), 3.57 W/cm(2), 20 sec, 2 J,≅71.4 J/cm(2)) on alternate days. Histomorphometry was assessed following digital image analysis. RESULTS The samples were evaluated on days 7, 14, and 21 after surgery; the IR protocol resulted in a significant reduction (p<0.018) in bone formation in Group III compared with Group I. Significant increases (p<0.006) in newly formed bone were noted in Group IV compared with Group III. No significant differences were observed between Group I and Group IV. CONCLUSIONS LLLT increased the newly formed bone area during the initial phase of the tibiae repair process in rats exposed to IR.
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Silva IHM, de Andrade SC, de Faria ABS, Fonsêca DDD, Gueiros LAM, Carvalho AAT, da Silva WTF, de Castro RM, Leão JC. Increase in the nitric oxide release without changes in cell viability of macrophages after laser therapy with 660 and 808 nm lasers. Lasers Med Sci 2016; 31:1855-1862. [DOI: 10.1007/s10103-016-2061-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 08/22/2016] [Indexed: 12/18/2022]
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Meng M, Yang M, Lv C, Yang Q, Yang Z, Chen S. Effect of Low-Level Laser Therapy on Relapse of Rotated Teeth: A Systematic Review of Human and Animal Study. Photomed Laser Surg 2016; 35:3-11. [PMID: 27564090 DOI: 10.1089/pho.2015.4069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
OBJECTIVE AND BACKGROUND Low-level laser therapy (LLLT) has been used to reduce the relapse of orthodontically rotated teeth. However, controversial conclusions have been drawn by different authors. This review aimed to evaluate the efficacy of LLLT on relapse of corrected tooth rotations systematically by overall search of available studies and scientific assessment. METHODS A comprehensive electronic search was performed through PubMed, MEDLINE, EMBASE, Web of Science, CENTRAL, PRL, and WHO ICTRP up to November 2015 with no language limitation. This systematic review was carried out according to Cochrane Handbook and the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. Risk of bias assessment was undertaken according to Cochrane Handbook for Systematic Reviews of Interventions. Two review authors conducted the work of search, selection, and quality assessment independently in duplicate. RESULTS Out of 112 studies, two animal experiments and one human study were included. Degree and percentage of relapse of rotated teeth were compared between control and LLLT group. CONCLUSIONS According to the results of our systematic review, the effect of LLLT on relapse of corrected tooth rotations is related to energy density. Namely, low energy density seems to promote relapse, while high energy density might alleviate the relapse. Since available investigations are limited, more well-designed randomized controlled trials involving humans are needed to get more clinically significant conclusions.
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Affiliation(s)
- Mingmei Meng
- 1 Department of Orthodontics, West China College of Stomatology, Sichuan University , Chengdu, China
| | - Min Yang
- 2 Department of Pharmacy, Mianyang Central Hospital , Mianyang, China
| | - Chunxiao Lv
- 1 Department of Orthodontics, West China College of Stomatology, Sichuan University , Chengdu, China
| | - Qingqing Yang
- 1 Department of Orthodontics, West China College of Stomatology, Sichuan University , Chengdu, China
| | - Zhenjin Yang
- 1 Department of Orthodontics, West China College of Stomatology, Sichuan University , Chengdu, China
| | - Song Chen
- 1 Department of Orthodontics, West China College of Stomatology, Sichuan University , Chengdu, China
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The effect of low-level laser therapy on non-surgical periodontal treatment: a randomized controlled, single-blind, split-mouth clinical trial. Lasers Med Sci 2016; 31:1767-1773. [DOI: 10.1007/s10103-016-2047-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Accepted: 08/05/2016] [Indexed: 12/28/2022]
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Lack EB, Butterwick KJ, Sadick N. Low-Level Laser-Assisted Liposuction: A Multicenter Side-by-Side Comparison Study. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/074880680302000205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction: Liposuction has undergone many revisions since 1980, the most notable being the introduction of the tumescent technique of local anesthesia by Jeffery Klein, MD. Since then, in an effort to improve the aesthetics of the technique and the ease and safety of the procedure, other techniques have been introduced. These include superficial liposuction, UAL, external ultrasonic liposuction, mechanically assisted liposuction, and, most recently, laser-assisted liposuction. Materials and Methods: Four centers in the United States, operating under an 1RB protocol, performed liposuction with the tumescent technique of local anesthesia on specified cosmetic units of the body. One side was exposed to 635-nm laser therapy after tumescence was achieved, whereas the contralateral side was not. Observations were recorded during surgery and at 2 weeks postoperatively. Results: Observations of intraoperative technique did not show an advantage to laser-assisted liposuction. Observations of the postoperative course were equivocal, though there was evidence of reduction of edema in certain patients. Discussion: The addition of laser therapy to liposuction technique is based on years of experience demonstrating improved wound healing using a technique of low-level laser therapy. Although the recorded observations did not support an advantage to the addition of laser therapy, there was a paradoxical difference of opinion among patients and surgeons who participated in the study. These individuals believed that, compared with patients not treated with low-level laser therapy, there was at least a reduction in degree and duration of postoperative pain and induration. As low-level laser therapy may have systemic effects on wound healing, comparing treated and untreated contralateral sides may not be valid because both sides experienced improvements in postoperative course. Laser-assisted liposuction has a potential advantage, not supported by this study, in the intraoperative and postoperative course of liposuction surgery. New studies using double-blind techniques will need to be conducted.
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Affiliation(s)
- Edward B. Lack
- From the Center for Liposculpture and Cosmetic Laser Surgery, Chicago, Ill (Dr Lack); Clinical Faculty Scripps Mercy Hospital, San Diego, Calif (Dr Butterwick); and Sadick Aesthetic Surgery and Dermatology, New York, NY (Dr Sadick)
| | - Kimberly J. Butterwick
- From the Center for Liposculpture and Cosmetic Laser Surgery, Chicago, Ill (Dr Lack); Clinical Faculty Scripps Mercy Hospital, San Diego, Calif (Dr Butterwick); and Sadick Aesthetic Surgery and Dermatology, New York, NY (Dr Sadick)
| | - Neil Sadick
- From the Center for Liposculpture and Cosmetic Laser Surgery, Chicago, Ill (Dr Lack); Clinical Faculty Scripps Mercy Hospital, San Diego, Calif (Dr Butterwick); and Sadick Aesthetic Surgery and Dermatology, New York, NY (Dr Sadick)
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Cenis JL, Aznar-Cervantes SD, Lozano-Pérez AA, Rojo M, Muñoz J, Meseguer-Olmo L, Arenas A. Silkworm Gut Fiber of Bombyx mori as an Implantable and Biocompatible Light-Diffusing Fiber. Int J Mol Sci 2016; 17:ijms17071142. [PMID: 27438824 PMCID: PMC4964515 DOI: 10.3390/ijms17071142] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 07/08/2016] [Accepted: 07/09/2016] [Indexed: 01/22/2023] Open
Abstract
This work describes a new approach to the delivery of light in deeper tissues, through a silk filament that is implantable, biocompatible, and biodegradable. In the present work, silkworm gut fibers (SGFs) of Bombyx mori L., are made by stretching the silk glands. Morphological, structural, and optical properties of the fibers have been characterized and the stimulatory effect of red laser light diffused from the fiber was assayed in fibroblast cultures. SGFs are formed by silk fibroin (SF) mainly in a β-sheet conformation, a stable and non-soluble state in water or biological fluids. The fibers showed a high degree of transparency to visible and infrared radiation. Using a red laser (λ = 650 nm) as source, the light was efficiently diffused along the fiber wall, promoting a significant increment in the cell metabolism 5 h after the irradiation. SGFs have shown their excellent properties as light-diffusing optical fibers with a stimulatory effect on cells.
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Affiliation(s)
- Jose Luis Cenis
- Department of Biotechnology, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), Murcia 30150, Spain.
| | - Salvador D Aznar-Cervantes
- Department of Biotechnology, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), Murcia 30150, Spain.
| | - Antonio Abel Lozano-Pérez
- Department of Biotechnology, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), Murcia 30150, Spain.
| | - Marta Rojo
- Departamento de Electromagnetismo y Electrónica, Universidad de Murcia, Murcia 30003, Spain.
| | - Juan Muñoz
- Departamento de Electromagnetismo y Electrónica, Universidad de Murcia, Murcia 30003, Spain.
| | - Luis Meseguer-Olmo
- Biomaterials & Tissue Engineering Unit & Orthopedic Surgery Service, V. Arrixaca University Hospital, Murcia 30120, Spain.
- Department of Health Sciences, UCAM-Catholic University of Murcia, Murcia 30107, Spain.
| | - Aurelio Arenas
- Departamento de Electromagnetismo y Electrónica, Universidad de Murcia, Murcia 30003, Spain.
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Ren C, McGrath C, Jin L, Zhang C, Yang Y. Effect of diode low-level lasers on fibroblasts derived from human periodontal tissue: a systematic review of in vitro studies. Lasers Med Sci 2016; 31:1493-510. [DOI: 10.1007/s10103-016-2026-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 07/05/2016] [Indexed: 10/21/2022]
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de Almeida VL, de Andrade Gois VL, Andrade RNM, Cesar CPHAR, de Albuquerque-Junior RLC, de Mello Rode S, Paranhos LR. Efficiency of low-level laser therapy within induced dental movement: A systematic review and meta-analysis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2016; 158:258-66. [PMID: 27016661 DOI: 10.1016/j.jphotobiol.2016.02.037] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 02/27/2016] [Accepted: 02/29/2016] [Indexed: 10/22/2022]
Abstract
The low level laser is widely used in Dentistry, in particular, to decrease pain and increase the speed of tooth movement. This study was to perform a systematic literature search to investigate the effectiveness of low level laser and low energy density therapy of the induced tooth movement. This research was performed following the PRISMA instructions and was registered in the PROSPERO. The articles were searched in six electronic databases, with no date and language restriction. Only randomized clinical trials were selected. Articles that did not use the extraction of first premolars as orthodontic planning were excluded, as well as articles using high energy density laser therapy. The articles were assessed for risk of bias and individual quality. The results were analyzed using meta-analysis, using randomized effect. The initial sample consisted of 161 articles. Six articles remained eligible for qualitative analysis and five for quantitative analysis. According to the individual quality, most articles were classified as high quality. Three articles detected statistically significant differences in induced movement by comparing the orthodontic movement between the experimental and control groups. For the maxilla, there was a statistically significant influence of the laser in three months and, for the mandible, in one month. It may be concluded that there is no evidence that laser therapy can accelerate the induced tooth movement.
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Affiliation(s)
| | | | | | | | | | - Sigmar de Mello Rode
- Department of Oral Pathology, Paulista State University, São José dos Campos, São Paulo, Brazil
| | - Luiz Renato Paranhos
- Department of Dentistry, Federal University of Sergipe, Lagarto, Sergipe, Brazil.
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76
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Fekrazad R, Asefi S, Allahdadi M, Kalhori KAM. Effect of Photobiomodulation on Mesenchymal Stem Cells. Photomed Laser Surg 2016; 34:533-542. [PMID: 27070113 DOI: 10.1089/pho.2015.4029] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE The purpose of this study was to review available literature about the effect of photobiomodulation (PBM) on mesenchymal stem cells (MSCs). BACKGROUND DATA The effects of coherent and noncoherent light sources such as low-level lasers and light-emitting diodes (LEDs) on cells and tissues, known as PBM, form the basis of photomedicine. This treatment technique effects cell function, proliferation, and migration, and plays an important role in tissue regeneration. Stem cells have been found to be helpful elements in tissue regeneration, and the combination of stem cell therapy and laser therapy appears to positively affect treatment results. MATERIALS AND METHODS An electronic search in PubMed was conducted of publications from the previous 12 years. English language articles related to the subject were found using selected key words. The full texts of potentially suitable articles were assessed according to inclusion and exclusion criteria. RESULTS After evaluation, 30 articles were deemed relevant according to the inclusion criteria. The energy density of the laser was 0.7-9 J/cm2. The power used for visible light was 30-110 mW and that used for infrared light was 50-800 mW. Nearly all studies showed that low-level laser therapy had a positive effect on cell proliferation. Similar outcomes were found for LED; however, some studies suggest that the laser alone is not effective, and should be used as an adjunct tool. CONCLUSIONS PBM has positive effects on MSCs. This review concluded that doses of 0.7-4 J/cm2 and wavelengths of 600-700 nm are appropriate for light therapy. The results were dependent upon different parameters; therefore, optimization of parameters used in light therapy to obtain favorable results is required to provide more accurate comparison.
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Affiliation(s)
- Reza Fekrazad
- 1 Dental Faculty, Periodontology Department, AJA University of Medical sciences , Tehran, Iran
| | - Sohrab Asefi
- 2 Postgraduate of Orthodontics, Shahid Beheshti University of Medical Sciences , Tehran, Iran
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Basso FG, Turrioni APS, Almeida LF, Soares DG, Oliveira CF, Hebling J, de Souza Costa CA. Nutritional deprivation and LPS exposure as feasible methods for induction of cellular - A methodology to validate for vitro photobiomodulation studies. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 159:205-10. [PMID: 27085052 DOI: 10.1016/j.jphotobiol.2016.04.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 04/03/2016] [Indexed: 12/19/2022]
Abstract
Previous studies have demonstrated that high biostimulation takes place when cells under stress are subjected to phototherapy by laser or light-emitting-diode (LED) devices. Several studies selected nutritional deprivation by reducing the concentration of fetal bovine serum (FBS) in the culture medium or the exposure of cultured cells to lipopolysaccharide (LPS) as an in vitro cellular stress condition. However, there are no data certifying that these stimuli cause stressful conditions for cultured cells. This investigation assessed the induction of cellular stress by decreasing the concentration of FBS or adding LPS to culture medium. Odontoblast-like cells (MDPC-23) were cultured in complete culture medium (DMEM) containing 10% FBS. After a 12-hour incubation period, the DMEM was replaced by fresh medium containing 10% FBS (control), low concentrations of FBS (0, 0.2, 0.5, 2, or 5%) or LPS from Escherichia coli (10μg/ml). After an additional 12-hour incubation, cell viability, total cell-counting, total protein production, and gene expression of heat shock protein 70 (HSP70) were assessed. Data were statistically analyzed by ANOVA complemented by the Tukey test, with 5% considered significant. Cell viability was negatively affected only for 0% FBS, while reduced viable cell numbers and total protein production were detected for FBS concentrations lower than 2%. Higher HSP70 gene expression was also observed for FBS concentrations lower than 2% and for cells exposed to LPS. The nutritional deprivation model with culture medium lower than 2% of FBS can be safely used to induce cellular stress for in vitro photobiomodulation studies.
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Affiliation(s)
- F G Basso
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil
| | - A P S Turrioni
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil
| | - L F Almeida
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil
| | - D G Soares
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil
| | - C F Oliveira
- Universidade de Ribeirão Preto, UNAERP - Ribeirão Preto, SP, Brazil
| | - J Hebling
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil
| | - C A de Souza Costa
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil.
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Ekizer A, Türker G, Uysal T, Güray E, Taşdemir Z. Light emitting diode mediated photobiomodulation therapy improves orthodontic tooth movement and miniscrew stability: A randomized controlled clinical trial. Lasers Surg Med 2016; 48:936-943. [DOI: 10.1002/lsm.22516] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/14/2016] [Indexed: 12/16/2022]
Affiliation(s)
- Abdullah Ekizer
- Faculty of Dentistry; Department of Orthodontics; Erciyes University; Kayseri Turkey
| | - Gökhan Türker
- Faculty of Dentistry; Department of Orthodontics; Erciyes University; Kayseri Turkey
| | - Tancan Uysal
- Faculty of Dentistry; Department of Orthodontics; Izmir Katip Celebi University; Izmir Turkey
| | | | - Zekeriya Taşdemir
- Faculty of Dentistry; Department of Periodontology; Erciyes University; Kayseri Turkey
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Hendudari F, Piryaei A, Hassani SN, Darbandi H, Bayat M. Combined effects of low-level laser therapy and human bone marrow mesenchymal stem cell conditioned medium on viability of human dermal fibroblasts cultured in a high-glucose medium. Lasers Med Sci 2016; 31:749-57. [PMID: 26984346 DOI: 10.1007/s10103-016-1867-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 01/03/2016] [Indexed: 02/07/2023]
Abstract
Low-level laser therapy (LLLT) exhibited biostimulatory effects on fibroblasts viability. Secretomes can be administered to culture mediums by using bone marrow mesenchymal stem cells conditioned medium (BM-MSCs CM). This study investigated the combined effects of LLLT and human bone marrow mesenchymal stem cell conditioned medium (hBM-MSCs CM) on the cellular viability of human dermal fibroblasts (HDFs), which was cultured in a high-glucose (HG) concentration medium. The HDFs were cultured either in a concentration of physiologic (normal) glucose (NG; 5.5 mM/l) or in HG media (15 mM/l) for 4 days. LLLT was performed with a continuous-wave helium-neon laser (632.8 nm, power density of 0.00185 W/cm(2) and energy densities of 0.5, 1, and 2 J/cm(2)). About 10% of hBM-MSCs CM was added to the HG HDF culture medium. The viability of HDFs was evaluated using dimethylthiazol-diphenyltetrazolium bromide (MTT) assay. A significantly higher cell viability was observed when laser of either 0.5 or 1 J/cm(2) was used to treat HG HDFs, compared to the control groups. The cellular viability of HG-treated HDFs was significantly lower compared to the LLLT + HG HDFs, hBM-MSCs CM-treated HG HDFs, and LLLT + hBM-MSCs CM-treated HG HDFs. In conclusion, hBM-MSCs CM or LLLT alone increased the survival of HG HDFs cells. However, the combination of hBM-MSCs CM and LLLT improved these results in comparison to the conditioned medium.
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Affiliation(s)
- Farzane Hendudari
- Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, 1985717443, 19395/4719, Tehran, Iran
| | - Abbas Piryaei
- Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, 1985717443, 19395/4719, Tehran, Iran. .,Urogenital Stem Cell Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Seyedeh-Nafiseh Hassani
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Hasan Darbandi
- Department of Immunology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Bayat
- Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, 1985717443, 19395/4719, Tehran, Iran.
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80
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Ren C, McGrath C, Jin L, Zhang C, Yang Y. The effectiveness of low-level laser therapy as an adjunct to non-surgical periodontal treatment: a meta-analysis. J Periodontal Res 2016; 52:8-20. [PMID: 26932392 PMCID: PMC5297978 DOI: 10.1111/jre.12361] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/08/2015] [Indexed: 12/11/2022]
Abstract
Background and Objectives Although low‐level laser therapy (LLLT) has been demonstrated to have a biomodulatory effect on periodontal tissue, no systematic review has exclusively addressed its effectiveness as an adjunct to non‐surgical periodontal treatment. This study aimed to evaluate whether an additional benefit exists for the application of LLLT compared with scaling and root planing (SRP) alone. Material and Methods An extensive search was conducted in the Cochrane Library (Issue 8, 2015), PubMed (1997) and EMBASE (1947) before August 2015 for randomized controlled trials (RCTs). The bias risk was assessed with the Cochrane tool for risk of bias evaluation. A meta‐analysis was performed using REVMAN 5.3. Results After independent screening of 354 initial records, eight publications (seven RCTs) were included. However, six were rated as ‘having a high risk of bias’ as a result of major methodological weakness in ‘allocation concealment’ and ‘blinding of key personnel’. Meta‐analysis showed that LLLT‐mediated SRP demonstrated significant short‐term benefits over SRP monotherapy in the improvement of the probing pocket depth (p = 0.0009 at 1 mo; p = 0.03 at 2 mo) and the level of interleukin‐1β in the gingival crevicular fluid (p = 0.01 at 1 mo). Nevertheless, LLLT failed to show significant additional intermediate‐term (3 and 6 mo) effects in terms of clinical parameters and alveolar bone density. Conclusion These findings indicated that LLLT showed only short‐term additional benefits after conventional SRP. Its long‐term effects remain unclear due to substantial methodological weaknesses and an insufficient number of current studies. Future RCTs with better designs and longer follow‐up periods are required to assess the effectiveness of LLLT as an adjunctive treatment strategy in patients with periodontal disease.
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Affiliation(s)
- C Ren
- Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR, China
| | - C McGrath
- Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR, China
| | - L Jin
- Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR, China
| | - C Zhang
- Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR, China
| | - Y Yang
- Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR, China
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81
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Tchanque‐Fossuo CN, Ho D, Dahle SE, Koo E, Li C, Isseroff RR, Jagdeo J. A systematic review of low‐level light therapy for treatment of diabetic foot ulcer. Wound Repair Regen 2016; 24:418-26. [DOI: 10.1111/wrr.12399] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 12/26/2015] [Indexed: 01/22/2023]
Affiliation(s)
- Catherine N. Tchanque‐Fossuo
- Dermatology Service, Sacramento VA Medical CenterMather California
- Department of DermatologyUniversity of California DavisSacramento California
| | - Derek Ho
- Dermatology Service, Sacramento VA Medical CenterMather California
| | - Sara E. Dahle
- Department of DermatologyUniversity of California DavisSacramento California
- Department of SurgeryPodiatry Section, Sacramento VA Medical CenterMather California
| | - Eugene Koo
- Dermatology Service, Sacramento VA Medical CenterMather California
| | - Chin‐Shang Li
- Department of Public Health Sciences, Division of BiostatisticsUniversity of California DavisDavis California
| | - R. Rivkah Isseroff
- Dermatology Service, Sacramento VA Medical CenterMather California
- Department of DermatologyUniversity of California DavisSacramento California
| | - Jared Jagdeo
- Dermatology Service, Sacramento VA Medical CenterMather California
- Department of DermatologyUniversity of California DavisSacramento California
- Department of DermatologyState University of New York Downstate Medical CenterBrooklyn New York
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82
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Doğan GE, Aksoy H, Demir T, Laloğlu E, Özyıldırım E, Sağlam E, Akçay F. Clinical and biochemical comparison of guided tissue regeneration versus guided tissue regeneration plus low-level laser therapy in the treatment of class II furcation defects: A clinical study. J COSMET LASER THER 2016; 18:98-104. [PMID: 26734916 DOI: 10.3109/14764172.2015.1114637] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The present study was aimed to compare the clinical and biochemical effectiveness of guided tissue regeneration (GTR) alone and combined with low-level laser therapy (LLLT) application in the treatment of furcation II periodontal defects, over a period of 6 months. MATERIAL AND METHODS Thirty-three furcation defects were included in the study. Seventeen of these defects were treated with GTR plus LLLT, and sixteen of them were treated with GTR alone. Probing pocket depth (PPD), clinical attachment level (CAL), horizontal probing depth (HPD), and alkaline phosphatase (ALP) and osteocalcin (OC) levels in the gingival crevicular fluid (GCF) were recorded at baseline and at postoperative 3rd and 6th months. RESULTS Healing was uneventful in all cases. At the 3rd and 6th months, both treatment modalities-GTR and GTR plus LLLT--showed improved PPD, CAL, and HPD values compared to their baseline values. ALP and OC levels in GCF increased after the treatment in both groups (p < 0.05). When compared the two groups, at the 6th month, PPD, CAL, HPD, and ALP values showed significantly more improvement in laser group than non-laser group (p < 0.05). CONCLUSIONS The results of this study showed that both treatments led to significantly favorable clinical improvements in furcation periodontal defects. LLLT plus GTR may be a more effective treatment modality compared to GTR alone.
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Affiliation(s)
- Gülnihal Emrem Doğan
- a Department of Periodontology , Faculty of Dentistry, Ataturk University , Erzurum , Turkey
| | - Hülya Aksoy
- b Department of Biochemistry , Medical Faculty, Ataturk University , Erzurum , Turkey
| | - Turgut Demir
- a Department of Periodontology , Faculty of Dentistry, Ataturk University , Erzurum , Turkey
| | - Esra Laloğlu
- b Department of Biochemistry , Medical Faculty, Ataturk University , Erzurum , Turkey
| | - Ercan Özyıldırım
- c Department of Public Health , Medical Faculty, Ataturk University , Erzurum , Turkey
| | - Ebru Sağlam
- a Department of Periodontology , Faculty of Dentistry, Ataturk University , Erzurum , Turkey
| | - Fatih Akçay
- b Department of Biochemistry , Medical Faculty, Ataturk University , Erzurum , Turkey
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83
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Synthesis of dental matrix proteins and viability of odontoblast-like cells irradiated with blue LED. Lasers Med Sci 2016; 31:523-30. [PMID: 26873499 DOI: 10.1007/s10103-016-1889-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 01/19/2016] [Indexed: 10/22/2022]
Abstract
To evaluate the effect of irradiation with light-emitting diode (LED; 455 nm) on the viability and synthesis of dentin matrix proteins by odontoblast-like cells, MDPC-23 cells were cultivated (10(4) cells/cm(2)) in 24-well culture plates. After 12 h incubation in Dulbecco's modified Eagle's medium (DMEM), the cells were submitted to nutritional restriction by means of reducing the concentration of fetal bovine serum (FBS) for an additional 12 h. Cells were irradiated one single time with one of the following energy densities (EDs): 0.5, 2, 4, 10, or 15 J/cm(2) and irradiance fixed at 20 mW/cm(2). Non-irradiated cells served as control. After 72 h, cells were evaluated with regard to viability (methylthiazol tetrazolium technique (MTT)), mineralization nodule (MN) formation, total protein (TP) production, alkaline phosphatase activity (ALP), and collagen synthesis (Sircol), n = 8. The data were submitted to Kruskal-Wallis and Mann-Whitney tests (p > 0.05). There was no statistical difference between the viability of cells irradiated or not (control), for all the EDs. However, an increase in TP was observed for all the EDs when compared with the control group. A reduced ALP activity was seen in all irradiated groups, except for the ED of 0.5 J/cm(2), which did not differ from the control. There was no difference between the irradiated groups and control regarding collagen synthesis, with the exception of the ED of 10 J/cm(2), which inhibited this cell function. Significant reduction in MN occurred only for the EDs of 0.5 and 2 J/cm(2). The single irradiation with blue LED (455 nm), irradiance of 20 mW/cm(2), and energy densities ranging from 0.5 to 15 J/cm(2) exerted no effective biostimulatory capacity on odontoblast-like cells.
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84
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Sergio LPS, Campos VMA, Vicentini SC, Mencalha AL, de Paoli F, Fonseca AS. Low-intensity red and infrared lasers affect mRNA expression of DNA nucleotide excision repair in skin and muscle tissue. Lasers Med Sci 2016; 31:429-35. [DOI: 10.1007/s10103-016-1870-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Accepted: 01/04/2016] [Indexed: 01/08/2023]
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85
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Chintavalakorn R, Tanglitanont T, Khantachawana A, Viravaidya-Pasuwat K, Santiwong P. The effect of light-emitting diode irradiation at different wavelengths on calcification of osteoblast-like cells in 3D culture. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2016; 2015:3513-6. [PMID: 26737050 DOI: 10.1109/embc.2015.7319150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
This study aimed to investigate the effect of four different light-emitting diode (LED) wavelengths on calcification and proliferation of osteoblast-like cells in vitro. MC3T3-E1 cells were seeded within three-dimensional collagen scaffolds and irradiated daily by LED light with peak emission wavelengths of 630-, 680-, 760- and 830-nm at constant fluency of 3.1 J/cm(2) (irradiance intensity 2 mW/cm(2)). Cultures were measured for calcium content at day 0, 7, 14, 21, 28, 35 and 42. The significant enhancement in calcium content was observed at the early stage of culture (days 7 and 14) (p<;0.05). After that, the calcium content of irradiated groups was similar to that of the controls group. This suggests the transient effect of light irradiation on osteoblastic cell calcification. Only 680-nm irradiated samples revealed a significant enhancement of calcium content until the late stages of culture (from days 21 to 42) (p<;0.001). The cyclin D mRNA expression that was investigated 3 hours after stimulation at day3 also show that the 680-nm LED irradiation can enhance cyclin D expression more than others. For enhancing bone mineralization, LED irradiation at the 680-nm is more effective than those at 630-, 760- and 830-nm. Further studies should be investigated in order to obtain the most effective parameters of LLLI on bone regeneration in clinical setting.
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86
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Koo HM, Yong MS, Na SS. The effect of low-intensity laser therapy (LILT) on cutaneous wound healing and pain relief in rats. J Phys Ther Sci 2015; 27:3421-3. [PMID: 26696711 PMCID: PMC4681918 DOI: 10.1589/jpts.27.3421] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 08/05/2015] [Indexed: 11/24/2022] Open
Abstract
[Purpose] This study examined the impact of low-intensity laser therapy on wound healing and pain control using a rat cutaneous wound model. [Subjects and Methods] Twenty-four adult male Sprague-Dawley rats (between 220-240 g, 7 weeks) were used in this study. The rats were anesthetized and a circular fragment of skin was removed from the dorsal region of the back by a punch with an 8-mm diameter. The animals were randomly divided into 6 groups, Groups C 1, C 3, and C 5, control groups, received no laser treatment. Groups T 1, T 3, and T 5 received laser treatment for 20 min per day for 1, 3 and 5 days, respectively. Lumbar spine and dorsal skin were extracted and processed using western blot analysis. [Results] Periodical observation showed increases in NGF expression on the skin, and decreases in c-fos expression by the spinal cord in the treatment groups compared to the control group. [Conclusion] The present findings suggest that low-intensity laser therapy could be used as an effective therapy for wound healing and pain relief, and could be further used as a clinical approach for treating cutaneous wounds.
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Affiliation(s)
- Hyun-Mo Koo
- Department of Physical Therapy, College of Science, Kyungsung University, Republic of Korea
| | - Min-Sik Yong
- Department of Physical Therapy, Youngsan University, Republic of Korea
| | - Sang-Su Na
- Department of Rehabilitation Science, Graduate School, Daegu University, Republic of Korea
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87
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Sperandio FF, Simões A, Corrêa L, Aranha ACC, Giudice FS, Hamblin MR, Sousa SCOM. Low-level laser irradiation promotes the proliferation and maturation of keratinocytes during epithelial wound repair. JOURNAL OF BIOPHOTONICS 2015; 8:795-803. [PMID: 25411997 PMCID: PMC4583360 DOI: 10.1002/jbio.201400064] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 08/29/2014] [Accepted: 10/10/2014] [Indexed: 05/21/2023]
Abstract
Low-level laser therapy (LLLT) has been extensively employed to improve epithelial wound healing, though the exact response of epithelium maturation and stratification after LLLT is unknown. Thus, this study aimed to assess the in vitro growth and differentiation of keratinocytes (KCs) and in vivo wound healing response when treated with LLLT. Human KCs (HaCaT cells) showed an enhanced proliferation with all the employed laser energy densities (3, 6 and 12 J/cm(2) , 660 nm, 100 mW), together with an increased expression of Cyclin D1. Moreover, the immunoexpression of proteins related to epithelial proliferation and maturation (p63, CK10, CK14) all indicated a faster maturation of the migrating KCs in the LLLT-treated wounds. In that way, an improved epithelial healing was promoted by LLLT with the employed parameters; this improvement was confirmed by changes in the expression of several proteins related to epithelial proliferation and maturation. Immunofluorescent expression of cytokeratin 10 (red) and Cyclin D1 (green) in (A) Control keratinocytes and (B) Low-level laser irradiated cells. Blue color illustrates the nuclei of the cells (DAPI staining).
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Affiliation(s)
- Felipe F Sperandio
- Department of Pathology and Parasitology, Institute of Biomedical Sciences, Federal University of Alfenas, Alfenas, 37130-000, MG, Brazil. ,
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA. ,
- Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA. ,
| | - Alyne Simões
- Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, São Paulo, 05508-000, SP, Brazil
| | - Luciana Corrêa
- Department of Oral Pathology, School of Dentistry, University of São Paulo, São Paulo, 05508-000, SP, Brazil
| | - Ana Cecília C Aranha
- Department of Restorative Dentistry, Special Laboratory of Lasers in Dentistry (LELO), School of Dentistry, University of São Paulo, São Paulo, 05508-000, SP, Brazil
| | - Fernanda S Giudice
- A. C. Camargo Cancer Center, National Institute of Oncogenomics and National Institute of Translational Neurosciences, São Paulo, 01508010, SP, Brazil
| | - Michael R Hamblin
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA 02139, USA
| | - Suzana C O M Sousa
- Department of Oral Pathology, School of Dentistry, University of São Paulo, São Paulo, 05508-000, SP, Brazil
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88
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Merigo E, Fornaini C, Meleti M, Manfredi M, Vescovi P. Low-Level Laser Therapy in odontostomatologia: istruzioni per l’uso. DENTAL CADMOS 2015. [DOI: 10.1016/s0011-8524(15)30064-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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89
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Kim TH, Kim NJ, Youn JI. Evaluation of wavelength-dependent hair growth effects on low-level laser therapy: an experimental animal study. Lasers Med Sci 2015; 30:1703-9. [DOI: 10.1007/s10103-015-1775-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 05/27/2015] [Indexed: 12/19/2022]
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90
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Awotidebe AW, Inglis-Jassiem G, Young T. Low-level laser therapy and exercise for patients with shoulder disorders in physiotherapy practice (a systematic review protocol). Syst Rev 2015; 4:60. [PMID: 25925768 PMCID: PMC4423144 DOI: 10.1186/s13643-015-0050-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 04/17/2015] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Low-level laser therapy is one of the adjunct treatments of choice with exercise therapy for shoulder rehabilitation in physiotherapy clinical practices. Although previous reviews have found little use of low-level laser therapy, there are recent trials whose findings are yet to be systematically reviewed. METHODS We plan to do a systematic review to assess the effects of low-level laser therapy with exercise and exercise alone in participants who are 18 years and above, with a clinical or radiological diagnosis of various shoulder pathologies. We will search CENTRAL, MEDLINE, CINAHL, PEDro, Science Direct, Scopus and Physiotherapy Choices regardless of publication status. We will hand search for subject-specific journals (PhotoMedicine and Laser Surgery, Lasers in Surgery and Medicine and Journals of Lasers in Medical Science) and conference proceedings of World Association for Laser Therapy. Two review authors will independently screen, select studies, extract data and assess the risk of bias based on a priori criteria. Disagreements between review authors will be resolved either through discussion or consultation with a third review author. If there are at least two clinically homogeneous studies, we will perform meta-analysis. DISCUSSION The findings will shed more light on the benefit of low-level laser therapy as an adjunct treatment to exercise in the management of shoulder disorders. The findings may also inform decision makers in the review and development of guidelines for shoulder rehabilitation in physiotherapy practices. SYSTEMATIC REVIEW REGISTRATION PROSPERO CRD42014013691.
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Affiliation(s)
- Adedapo W Awotidebe
- Division of Community Health, Department of Interdisciplinary Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Francie van Zijl Rylaan Drive, Tygerberg Campus, PO Box 19063, Cape Town, 7505, South Africa.
| | - Gakeemah Inglis-Jassiem
- Division of Physiotherapy, Department of Interdisciplinary Health Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Francie van Zijl Rylaan Drive, Tygerberg Campus, PO Box 19063, Cape Town, 7505, South Africa.
| | - Taryn Young
- Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Francie van Zijl Rylaan Drive, Tygerberg Campus, PO Box 19063, Cape Town, 7505, South Africa.
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91
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Phototherapy improves wound healing in rats subjected to high-fat diet. Lasers Med Sci 2015; 30:1481-8. [PMID: 25862476 DOI: 10.1007/s10103-015-1745-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 03/18/2015] [Indexed: 12/25/2022]
Abstract
This study aimed to compare the phototherapy effects on wound healing in rats submitted to normal and high-fat diets. Thirty-six rats received normal lipidic diet (NL) and 36 high lipidic (HL) diet for 45 days. The nutritional status was measured by body mass, blood glucose, total cholesterol, and triglycerides levels. Four experimental groups were performed according light (L) therapy applied "on" or "off" (660 nm, 100 mW, 70 J/cm(2), 2 J) on 1.5-mm-punched dorsum skin wounds as NLL+, NLL-, HLL+, and HLL-. The wound healing rate (WHR) and oxidative stress markers were analyzed on 2nd, 7th, and 14th days. Despite no difference among body mass, the HL rats presented higher blood glucose, total cholesterol, and triglycerides levels than NL rats. Respectively, on the 2nd and 14th days, the HLL+ group presented the highest WHRs (0.38 ± 0.16/0.97 ± 0.02) among all groups, while the HLL- (-0.002 ± 0.12/0.81 ± 12.1) the lowest WHRs. Hydroxyproline level was lower in HLL- (6.41 ± 1.09 μg/mg) than HLL+ (7.71 ± 0.61 μg/mg) and also NLL+ (9.33 ± 0.84 μg/mg). HLL+ presented oxidative stress markers similar to normal control group (NLL-) during follow up and highest antioxidant defense on 7th day. The results showed phototherapy accelerated the cutaneous wound healing by modulating oxidative stress in rats with metabolic disorders under a high-fat diet.
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92
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Leite SN, Andrade TAMD, Masson-Meyers DDS, Leite MN, Enwemeka CS, Frade MAC. Phototherapy promotes healing of cutaneous wounds in undernourished rats. An Bras Dermatol 2015; 89:899-904. [PMID: 25387494 PMCID: PMC4230658 DOI: 10.1590/abd1806-4841.20143356] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2014] [Accepted: 01/16/2014] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Various studies have shown that phototherapy promotes the healing of cutaneous wounds. OBJECTIVE To investigate the effect of phototherapy on healing of cutaneous wounds in nourished and undernourished rats. METHODS Forty rats, 20 nourished plus 20 others rendered marasmus with undernourishment, were assigned to four equal groups: nourished sham, nourished Light Emitting Diode treated, undernourished sham and undernourished Light Emitting Diode treated. In the two treated groups, two 8-mm punch wounds made on the dorsum of each rat were irradiated three times per week with 3 J/cm2 sq cm of combined 660 and 890 nm light; wounds in the other groups were not irradiated. Wounds were evaluated with digital photography and image analysis, either on day 7 or day 14, with biopsies obtained on day 14 for histological studies. RESULTS Undernourishment retarded the mean healing rate of the undernourished sham wounds (p < 0.01), but not the undernourished Light emission diode treated wounds, which healed significantly faster (p < 0.001) and as fast as the two nourished groups. Histological analysis showed a smaller percentage of collagen in the undernourished sham group compared with the three other groups, thus confirming our photographic image analysis data. CONCLUSION Phototherapy reverses the adverse healing effects of undernourishment. Similar beneficial effects may be achieved in patients with poor nutritional status.
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93
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Low-level laser therapy in the treatment of recurrent aphthous ulcers: a systematic review. ScientificWorldJournal 2015; 2015:150412. [PMID: 25879049 PMCID: PMC4386290 DOI: 10.1155/2015/150412] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Accepted: 10/31/2014] [Indexed: 11/23/2022] Open
Abstract
Recurrent aphthous ulcers (RAUs) are the most common lesion found in the oral cavity. There is no definitive cure for RAUs and current treatments are aimed at minimizing symptoms. Since low-level laser therapy (LLLT) modulates inflammatory responses, and promotes pain reduction and cellular biostimulation, LLLT can be suggested as an alternative treatment for RAUs. The literature concerning the potential of LLLT in the treatment of RAUs was evaluated. A systematic literature review identified 22 publications, of which only 2 studies were adopted. The eligibility criteria consisted of randomized controlled trials (RCTs). Both RCTs achieved significant results concerning LLLT and pain-level reductions and reduced healing times. Despite the variance in irradiation conditions applied in both studies, very similar wavelengths were adopted. There is accordingly strong evidence that wavelength plays an important role in RAU treatment. Taking into account the different parameters applied by selected RCTs, it is not possible to suggest that a specific protocol should be used. However, in light of the significant results found in both studies, LLLT can be suggested as an alternative for RAU treatment. Additional RCTs should be performed in order to reach a clinical protocol and better understand the application of LLLT in RAU treatment.
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94
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Curra M, Pellicioli ACA, Filho NAK, Ochs G, Matte Ú, Filho MS, Martins MAT, Martins MD. Photobiomodulation reduces oral mucositis by modulating NF-kB. JOURNAL OF BIOMEDICAL OPTICS 2015; 20:125008. [PMID: 26720873 DOI: 10.1117/1.jbo.20.12.125008] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 11/20/2015] [Indexed: 06/05/2023]
Abstract
The aim of this study was to evaluate NF-kB during 5-fluorouracil (FU)-induced oral mucositis and ascertain whether photobiomodulation (PBM), as a preventive and/or therapeutic modality, influences this transcription factor. Ninety-six male golden Syrian hamsters were allocated into four groups: control (no treatment); PBM therapeutic, PBM preventive, and PBM combined. Animals received an injection of 5-FU on days 0 and 2. On days 3 and 4, the buccal mucosa was scratched. Irradiation was carried out using a 660-nm, 40-mW diode laser at 6 J/cm(2) during 6 s/point, 0.24 J/point, for a total dose of 1.44 J/day of application. Animals were euthanized on days 0, 5, 10, and 15 (n=6). Buccal mucosa was removed for protein quantification by Western blot. Clinical analysis revealed that PBM groups exhibited less mucositis than controls on day 10. Control animals exhibited lower levels of NF-kB during mucositis development and healing. The preventive and combined protocols were associated with higher NF-kB levels at day 5; however, the therapeutic group had higher levels at days 10 and 15. These findings suggest that the preventive and/or therapeutic PBM protocols reduced the severity of oral mucositis by activating the NF-kB pathway.
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Affiliation(s)
- Marina Curra
- Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Oral Pathology, Rua Ramiro Barcelos, 2492, Porto Alegre, Rio Grande do Sul 90035-003, Brazil
| | - Ana Carolina Amorim Pellicioli
- Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Oral Pathology, Rua Ramiro Barcelos, 2492, Porto Alegre, Rio Grande do Sul 90035-003, Brazil
| | - Nélson Alexandre Kretzmann Filho
- Hospital de Clínicas de Porto Alegre, Department of Gene Therapy, Rua Ramiro Barcelos, 2350, Porto Alegre, Rio Grande do Sul 90950-000, Brazil
| | - Gustavo Ochs
- Hospital de Clínicas de Porto Alegre, Department of Gene Therapy, Rua Ramiro Barcelos, 2350, Porto Alegre, Rio Grande do Sul 90950-000, Brazil
| | - Úrsula Matte
- Hospital de Clínicas de Porto Alegre, Department of Gene Therapy, Rua Ramiro Barcelos, 2350, Porto Alegre, Rio Grande do Sul 90950-000, Brazil
| | - Manoel Sant'Ana Filho
- Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Oral Pathology, Rua Ramiro Barcelos, 2492, Porto Alegre, Rio Grande do Sul 90035-003, Brazil
| | - Marco Antonio Trevizani Martins
- Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Oral Pathology, Rua Ramiro Barcelos, 2492, Porto Alegre, Rio Grande do Sul 90035-003, Brazil
| | - Manoela Domingues Martins
- Universidade Federal do Rio Grande do Sul, School of Dentistry, Department of Oral Pathology, Rua Ramiro Barcelos, 2492, Porto Alegre, Rio Grande do Sul 90035-003, Brazil
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95
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Chaves MEDA, Araújo ARD, Piancastelli ACC, Pinotti M. Effects of low-power light therapy on wound healing: LASER x LED. An Bras Dermatol 2014; 89:616-23. [PMID: 25054749 PMCID: PMC4148276 DOI: 10.1590/abd1806-4841.20142519] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Accepted: 07/29/2013] [Indexed: 12/28/2022] Open
Abstract
Several studies demonstrate the benefits of low-power light therapy on wound
healing. However, the use of LED as a therapeutic resource remains
controversial. There are questions regarding the equality or not of biological
effects promoted by LED and LASER. One objective of this review was to determine
the biological effects that support the use of LED on wound healing. Another
objective was to identify LED´s parameters for the treatment of wounds. The
biological effects and parameters of LED will be compared to those of LASER.
Literature was obtained from online databases such as Medline, PubMed, Science
Direct and Scielo. The search was restricted to studies published in English and
Portuguese from 1992 to 2012. Sixty-eight studies in vitro and in animals were
analyzed. LED and LASER promote similar biological effects, such as decrease of
inflammatory cells, increased fibroblast proliferation, stimulation of
angiogenesis, granulation tissue formation and increased synthesis of collagen.
The irradiation parameters are also similar between LED and LASER. The
biological effects are dependent on irradiation parameters, mainly wavelength
and dose. This review elucidates the importance of defining parameters for the
use of light devices.
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Affiliation(s)
| | | | | | - Marcos Pinotti
- Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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96
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Park JT, Hong KS. Effect of light-emitting-diode irradiation on the proliferation and migration in human gingival fibroblasts. Tissue Eng Regen Med 2014. [DOI: 10.1007/s13770-014-9061-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
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97
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Jajarm HH, Falaki F, Sanatkhani M, Ahmadzadeh M, Ahrari F, Shafaee H. A comparative study of toluidine blue-mediated photodynamic therapy versus topical corticosteroids in the treatment of erosive-atrophic oral lichen planus: a randomized clinical controlled trial. Lasers Med Sci 2014; 30:1475-80. [DOI: 10.1007/s10103-014-1694-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Accepted: 11/17/2014] [Indexed: 11/30/2022]
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98
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Abdel-Salam Z, Harith MA. Laser researches on livestock semen and oocytes: A brief review. J Adv Res 2014; 6:311-7. [PMID: 26257928 PMCID: PMC4522585 DOI: 10.1016/j.jare.2014.11.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Revised: 11/13/2014] [Accepted: 11/14/2014] [Indexed: 12/04/2022] Open
Abstract
This article presents a brief review of the past and present literature pertinent to laser effects on sperm motility parameters, improvement of oocyte maturation and characterization of semen in livestock. The aim was, on one hand, to make the readers aware of such knowledge and on the other hand to trigger the interest of the animal reproduction scientific community in attempting some laser techniques that have not yet been fully exploited in the field of artificial insemination. With respect to the conventional methods, laser is a more sensitive and less costly technology that can be used for improving artificial insemination and embryo production system. Since 1980s, laser treatment came on the biological samples scene; its applications have continuously been developed thereafter. Exploitation of laser light by various researchers for improving the reproductive efficiency of sperm cells and the maturation rate in different livestock is demonstrated herein. Laser irradiation, in principal, can increase the production of adenosine triphosphate (ATP) and consequently increases the energy provided to the cell. Since sperm motility and oocyte maturation depend on the energy consumption, an increase in the energy supply to the cells will be of great importance. In addition, the authors also discuss the use of laser spectrochemical analytical techniques, such as laser induced breakdown spectroscopy (LIBS) and laser induced fluorescence (LIF), in characterization of semen samples.
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Affiliation(s)
- Z Abdel-Salam
- National Institute of Laser Enhanced Science, Cairo University, Egypt
| | - M A Harith
- National Institute of Laser Enhanced Science, Cairo University, Egypt
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99
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Turrioni APS, Basso FG, Montoro LA, Almeida LDFDD, Costa CADS, Hebling J. Phototherapy up-regulates dentin matrix proteins expression and synthesis by stem cells from human-exfoliated deciduous teeth. J Dent 2014; 42:1292-9. [DOI: 10.1016/j.jdent.2014.07.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 07/15/2014] [Accepted: 07/16/2014] [Indexed: 01/09/2023] Open
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100
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Turrioni APS, Basso FG, Alonso JRL, de Oliveira CF, Hebling J, Bagnato VS, de Souza Costa CA. Transdentinal cell photobiomodulation using different wavelengths. Oper Dent 2014; 40:102-11. [PMID: 25136901 DOI: 10.2341/13-370-l] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVE The aim of this study was to investigate the effects of transdentinal irradiation with different light-emitting diode (LED) parameters on odontoblast-like cells (MDPC-23). METHODS AND MATERIALS Human dentin discs (0.2 mm thick) were obtained, and cells were seeded on their pulp surfaces with complete culture medium (Dulbecco modified Eagle medium). Discs were irradiated from the occlusal surfaces with LED at different wavelengths (450, 630, and 840 nm) and energy densities (0, 4, and 25 J/cm(2)). Cell viability (methyltetrazolium assay), alkaline phosphatase activity (ALP), total protein synthesis (TP), and cell morphology (scanning electron microscopy) were evaluated. Gene expression of collagen type I (Col-I) was analyzed by quantitative polymerase chain reaction (PCR). Data were analyzed by the Mann-Whitney test with a 5% significance level. RESULTS Higher cell viability (21.8%) occurred when the cells were irradiated with 630 nm LED at 25 J/cm(2). Concerning TP, no statistically significant difference was observed between irradiated and control groups. A significant increase in ALP activity was observed for all tested LED parameters, except for 450 nm at 4 J/cm(2). Quantitative PCR showed a higher expression of Col-I by the cells subjected to infrared LED irradiation at 4 J/cm(2). More attached cells were observed on dentin discs subjected to irradiation at 25 J/cm(2) than at 4 J/cm(2). CONCLUSION The infrared LED irradiation at an energy density of 4 J/cm(2) and red LED at an energy density of 25 J/cm(2) were the most effective parameters for transdentinal photobiomodulation of cultured odontoblast-like cells.
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