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Yazdani J, Eslami H, Ghavimi M, Eslami M. Adjunctive Effect of Photobiomodulation Therapy with Nd:YAG Laser in the Treatment of Inferior Alveolar Nerve Paresthesia. Photobiomodul Photomed Laser Surg 2024; 42:208-214. [PMID: 38512321 DOI: 10.1089/photob.2023.0159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2024] Open
Abstract
Background: Disruption of peripheral branches of the trigeminal nerve in the field of maxillofacial surgery is a known risk due to the close connection of these branches with the bony structures of the maxilla and mandible. As a result, injuries of the lingual nerve and inferior alveolar nerve take place within routine maxillofacial surgery procedures, including local anesthetic injection, wisdom tooth surgery, and dental implant placement, resulting in paresthesia and dysesthesia. During the last three decades, low-level lasers (LLL) have been frequently used in various medical fields. Lately, this application has increased in several sectors. Methods and materials: This experiment was designed to explore the effect of low-level laser therapy (LLLT) with Nd:YAG on the paresthesia and dysesthesia of the lower lip. This ethics committee of Tbzmed, Tabriz, Iran, proved the present experiment with ethical code: IR.TBZMED.REC.1401.839. Results: After completing 10 sessions of laser therapy for the case group consisting of 25 patients with lower lip anesthesia, the visual analog scale index results revealed that following six sessions of laser therapy, a significant difference appeared in contrast to the control group. Also, according to the two-point tests, significant difference among the experimental and the control group appeared after ninth session of the laser therapy. Conclusions: Altogether, these data suggested LLLT with Nd:YAG as an effective treatment option for decreasing the anesthesia of the lower lip.
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Affiliation(s)
- Javad Yazdani
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hosein Eslami
- Department of Oral and Maxillofacial Medicine, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - MohamadAli Ghavimi
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Meghdad Eslami
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
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Scribante A, Pellegrini M, Pulicari F, Porrini M, Bosotti M, Spadari F. Nerve Injury and Photobiomodulation, a Promising Opportunity: A Scoping Review on Laser Assisted Protocols for Lesions in the Oral Region. APPLIED SCIENCES 2023; 13:9258. [DOI: 10.3390/app13169258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/05/2023]
Abstract
The currently available therapeutic options for restoring function and sensitivity in long-term nervous injuries pose challenges. Microsurgery interventions for direct nerve repair often lead to serious complications and limited success. Non-surgical methods, although somewhat effective, have limited benefits. These methods involve drug administration, such as with analgesics or corticosteroids. Photobiomodulation therapy (PBMT) has emerged as a promising approach based on clinical and laboratory studies. PBMT stimulates the migration and proliferation of neuronal fiber cellular aggregates, as reported in the literature. Experimental studies on animal models with peripheral nerve compression injuries have shown that PBMT can enhance the functionality of damaged nerves, preserving their activity and preventing scar tissue formation. The mechanism of action depends on the wavelength, which can positively or negatively affect photo acceptor resonances, influencing their conformation and activities. These findings suggest that photobiomodulation may accelerate and improve nerve regeneration. This review explores various methodologies used in photobiomodulation for regenerating nerve sensitivity after surgical trauma involving nerve structures, in the oral and peri-oral region. Research was conducted to evaluate which laser-assisted therapeutic protocols are used to improve the recovery of nervous sensitivity, using the JBI methodology for scoping reviews and following the PRISMA methodology.
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Affiliation(s)
- Andrea Scribante
- Section of Dentistry, Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy
| | - Matteo Pellegrini
- Maxillofacial Surgery and Dental Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, 20122 Milan, Italy
| | - Federica Pulicari
- Maxillofacial Surgery and Dental Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, 20122 Milan, Italy
| | - Massimo Porrini
- Maxillofacial Surgery and Dental Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, 20122 Milan, Italy
| | - Moreno Bosotti
- Maxillofacial Surgery and Dental Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, 20122 Milan, Italy
| | - Francesco Spadari
- Maxillofacial Surgery and Dental Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, 20122 Milan, Italy
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Jazaeri M, Torkzaban P, Afshar S, Najafi-Vosough R, Arany P, Gholami L. Comparison of Pulsed and Continuous Wave Diode Laser at 940 nm on the Viability and Migration of Gingival Fibroblasts. Photochem Photobiol 2022; 99:1003-1009. [PMID: 36086909 DOI: 10.1111/php.13711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Accepted: 09/07/2022] [Indexed: 11/28/2022]
Abstract
Gingival fibroblasts have critical roles in oral wound healing. Photobiomodulation (PBM) has been shown to promote mucosal healing and is now recommended for managing oncotherapy-associated oral mucositis. This study examined the effects of the emission mode of a 940 nm diode laser on the viability and migration of human gingival fibroblasts. Cells were cultured in a routine growth media and treated with PBM (average power 0.1 W/cm2 , average fluence 3 J/cm2 , every 12h for 6 sessions) in one continuous wave (CW) and two pulsing settings with 20 % and 50 % duty cycles. Cell viability was assessed using MTT, and digital imaging quantified cell migration. After 48 and 72 hours, all treatment groups had significantly higher viability (n = 6, p < 0.05) compared to the control. The highest viability was seen in the pulsed (20% duty cycle) group at the 72-hour time point. PBM improved fibroblast migration in all PBM-treated groups, but differences were not statistically significant (n = 2, p > 0.05). PBM treatments can promote cell viability in both continuous and pulsed modes. Further studies are needed to elucidate the optimal setting for PBM-evoked responses for its rationalized use in promoting specific phases of oral wound healing.
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Affiliation(s)
- Marzieh Jazaeri
- Dental Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Parviz Torkzaban
- Department of Periodontics, School of Dentistry, Dental Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Saeid Afshar
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Roya Najafi-Vosough
- Department of Biostatistics, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Praveen Arany
- Oral Biology, Surgery, Biomedical Engineering, University at Buffalo, NY, USA
| | - Leila Gholami
- Department of Periodontics, School of Dentistry, Dental Implants Research Center, Hamadan University of Medical Sciences, Hamadan, Iran.,Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, Canada
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AL-Timimi Z. Improvement of antibiotics absorption and regulation of tissue oxygenation through blood laser irradiation. Heliyon 2021; 7:e06863. [PMID: 33997396 PMCID: PMC8093474 DOI: 10.1016/j.heliyon.2021.e06863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 03/25/2021] [Accepted: 04/16/2021] [Indexed: 11/20/2022] Open
Abstract
A point of this work is to estimate the impact of laser blood irradiation controlled intravenously at the level of an antibiotic. Hundred and twenty grown-up female adult rabbits were utilized in this investigation. They were separated into two equivalent groups relying upon the method for managing of the antibiotic. First group injected with10 mg/kg b. w of Moxifloxacin antibiotic while second group was given the Moxifloxacin but in a type of a tablet, containing 10 mg/kg.b.w orally. Following, each group was partitioned into four equivalent subgroups; control and treated with laser therapy at different time. Gallium-Arsenide (GaAs) laser device, utilized for treatment, in wavelength 904 nm, power of 5mW, its include a connector by optical fiber with fine cannula fixed at its end. Rabbits of laser subgroup; were treated by presenting needle of cannula into ear-marginal vein for 10, 20 and 30min. Blood samples have been collected from both groups after 1, 2, 3, 4, 5 and 6 h intervals after treatment and had transmitted for analysis via a high-pressure liquid chromatography to determine level of Moxifloxacin in blood. The after-effects' revealed a regular increment in Moxifloxacin level (ng/ml) in two groups until 3 h followed with a rapid decline until the end of the experiment. Blood Irradiation through low-level laser enhances the concentration of Moxifloxacin in the serum whatsoever; was the rout of its performance, besides the irradiation help within quickened clearance of blood beginning the drug.
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Affiliation(s)
- Zahra AL-Timimi
- Laser Physics Department, College of Science for Women, University of Babylon, Hillah, Iraq
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Al-Timimi Z. Evaluation of the Significance of Constant Laser Therapy, 532 nm, in Various Exposure Times on the Healing Process of Wounds Infected by Acinetobacter baumannii. INT J LOW EXTR WOUND 2021; 21:640-646. [PMID: 33393388 DOI: 10.1177/1534734620984039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Many considerable investigations focused on the stimulation of therapeutic manners of infected injuries in mice. The exaggerated pathogens that induced wounds were gram-positive like staphylococcal and gram-negative, for example, Pseudomonas aeuroginosa and Acinetobacter baumannii. Acinetobacter can generate a scale range of an infection that may be received in a hospital or any wellness concern facility. In order to know the significance of laser 532 nm with a constant irradiance at various exposure times on the healing process of wounds infected by Acinetobacter baumannii, this study was performed on the BALB/C mice. An elliptical full-thickness skin injury was made on the backside of 45 adult female (BALB/C) mice. Injuries were affected via Acinetobacter baumannii and were randomly assigned into 3 groups. Semiconductor diode continuous wave laser, λ = 532 nm, with output power 40 mW was used. The power density was 5.71 mW/cm2, while the fluencies were 1.7 J/cm2 and 5.14 J/cm2. Fifteen mice were classified according to the times of irradiation. The first group was infected and presented as control, without irradiation. The second group was infected and irradiated for 5 minutes. The third group, likewise, was infected but irradiated for 15 minutes. All groups were subdivided according to the following period, 3, 5, and 10 days, after irradiation and the animals were killed after the treatment. Wound healing was made by measuring the rate of wound closure and histopathological evaluation. The study determined that 532 nm laser therapy had an obvious and positive influence on the healing of infected wounds with fluence (5.14 J/cm2).
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Matys J, Flieger R, Świder K, Gedrange T, Hutchings G, Dyszkiewicz-Konwińska M, Kempisty B, Nammour S, Dominiak M, Grzech-Leśniak K. A Clinical Trial of Photobiomodulation Effect on Orthodontic Microscrews Stability Using a 635 nm Red Laser Light. PHOTOBIOMODULATION PHOTOMEDICINE AND LASER SURGERY 2020; 38:607-613. [PMID: 33026974 DOI: 10.1089/photob.2020.4863] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Background: One of the procedures enhancing implants stability can be photobiomodulation. Objective: To assess the effect of a 635 nm wavelength on orthodontic microscrews stability, survival rate, and an individual patient's pain score. Materials and methods: The study was done with 15 subjects, 30 orthodontic microscrews with a length of 10 mm and diameter 1.4 mm. Implants inserted on the right and left side of the maxilla. The implants in the test group (G1) were irradiated with the laser at palatal and buccal part of peri-implant area (two points). The diode laser (SmartM PRO; Lasotronix, Warsaw, Poland) was used with the following settings: power: 100 mW, spot size: 0.5 cm2, mean power density (irradiance): 200 mW/cm2, in continuous wave (CW) mode, energy per point: 4 J, radiant exposure: 8 J/cm2, time per point: 40 sec, the total energy dose (radiant energy) per session: 8 J in contact mode, handpiece diameter: 8 mm. Laser sessions: day of surgery and 3, 6, 9, 12, 15, 30 days later. Cumulative radiant energy was 59 J. Periotest appliance was used to assess the microscrews stability at day of surgery and 3, 6, 9, 12, 15, 30, 60 days later. Each patient received a survey for individual pain assessment (NRS-11) promptly after the implantation. Results: The analysis after 60 days revealed significantly higher secondary stability for the laser-irradiated microscrews group in comparison with control implants (G2 group) (p = 0.0037). We observed significantly higher stability in the experimental group compared with the control after 30 days (p = 0.0218). Moreover, we noted significantly higher microimplants stability for the control group in comparison with the test group, 9 days after implantation (p = 0.0374). Laser application had no effect on pain reduction noted in the first day in comparison with the control sites (p = 0.6690). No microscrews were lost in the study. Conclusions: Application of a 635 nm laser on peri-implant soft tissue increased the microscrews stability after 30 and 60 days.
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Affiliation(s)
- Jacek Matys
- Laser Laboratory, Department of Dental Surgery, Wroclaw Medical University, Wroclaw, Poland
| | - Rafał Flieger
- Department of Orthodontics, Dentimed Outpatient Clinic, Kościan, Poland
| | | | - Tomasz Gedrange
- Department of Dental Surgery, Wroclaw Medical University, Wroclaw, Poland.,Department of Orthodontics, Technische Universität Dresden, Dresden, Germany
| | - Greg Hutchings
- The School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, United Kingdom.,Department of Anatomy, Poznan University of Medical Sciences, Poznan, Poland
| | - Marta Dyszkiewicz-Konwińska
- Department of Biomaterials and Experimental Dentistry and Poznan University of Medical Sciences, Poznan, Poland.,Department of Anatomy, Poznan University of Medical Sciences, Poznan, Poland
| | - Bartosz Kempisty
- Department of Anatomy and Poznan University of Medical Sciences, Poznan, Poland.,Department of Histology and Embryology, Poznan University of Medical Sciences, Poznan, Poland.,Department of Obstetrics and Gynaecology, University Hospital and Masaryk University, Brno, Czech Republic.,Department of Veterinary Surgery, Institute of Veterinary Medicine, Nicolaus Copernicus University, Toruń, Poland
| | - Samir Nammour
- Department of Dental Science, Faculty of Medicine, University of Liege, Liege, Belgium
| | - Marzena Dominiak
- Department of Dental Surgery, Wroclaw Medical University, Wroclaw, Poland
| | - Kinga Grzech-Leśniak
- Laser Laboratory, Department of Dental Surgery, Wroclaw Medical University, Wroclaw, Poland.,Department of Periodontics, Virginia Commonwealth University School of Dentistry, Richmond, Virginia, USA
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Tsai HW, Wang PH, Hsu PT, Chen SN, Lin LT, Li CJ, Tsui KH. Laser irradiation pretreatment improves endometrial preparation of frozen-thawed embryo transfer in recurrent implantation failure patients. Gynecol Endocrinol 2020; 36:734-738. [PMID: 31928249 DOI: 10.1080/09513590.2020.1712694] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Recurrent implantation failure (RIF) remains a clinical dilemma. Helium-Neon (He-Ne) laser irradiation has recently become more popular under certain clinical conditions. Given the unique therapeutic effects, we were interested in determining whether pretreatment with He-Ne laser irradiation prior to frozen-thawed embryo transfer (FET) would improve the microcirculation and cause the release of growth factors and cytokines, thus improving endometrial receptivity and the clinical pregnancy rates. Patients chose for themselves whether to proceed with (n = 29) or without (n = 31) pretreatment with He-Ne laser irradiation prior to FET. The clinical pregnancy rate (37.9%) and implantation rate (20.3%) were higher in the laser-treatment group than in the control group (35.5% and 15.9%, respectively, p = .844 and .518, respectively). The live birth rate was higher in the laser-treatment group (27.6% vs. 25.8%, respectively, p = .876) and the miscarriage rate was lower in the laser-treatment group (18.2% and 27.3%, respectively, p = .611). No side effects or complications from laser irradiation were encountered in patients who received the laser treatment. We concluded that pretreatment with He-Ne laser prior to FET may be an alternative choice for RIF-affected women; however, additional well-designed prospective studies are necessary to determine the precise clinical value of this treatment.
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Affiliation(s)
- Hsiao-Wen Tsai
- Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
- Department of Obstetrics and Gynecology, National Yang-Ming University, Taipei, Taiwan
- Shu-Zen Junior College of Medicine and Management, Kaohsiung, Taiwan
| | - Peng-Hui Wang
- Department of Obstetrics and Gynecology, National Yang-Ming University, Taipei, Taiwan
- Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, Taipei, Taiwan
- Department of Medical Research, China Medical University Hospital, Taichung, Taiwan
- Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Pei-Te Hsu
- Department of Physical Medicine & Rehabilitation, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - San-Nung Chen
- Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Li-Te Lin
- Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Chia-Jung Li
- Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Kuan-Hao Tsui
- Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
- Department of Pharmacy and Master Program, College of Pharmacy and Health Care, Tajen University, Pingtung County, Taiwan
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Photobiomodulation-Underlying Mechanism and Clinical Applications. J Clin Med 2020; 9:jcm9061724. [PMID: 32503238 PMCID: PMC7356229 DOI: 10.3390/jcm9061724] [Citation(s) in RCA: 216] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/14/2020] [Accepted: 06/01/2020] [Indexed: 02/07/2023] Open
Abstract
The purpose of this study is to explore the possibilities for the application of laser therapy in medicine and dentistry by analyzing lasers' underlying mechanism of action on different cells, with a special focus on stem cells and mechanisms of repair. The interest in the application of laser therapy in medicine and dentistry has remarkably increased in the last decade. There are different types of lasers available and their usage is well defined by different parameters, such as: wavelength, energy density, power output, and duration of radiation. Laser irradiation can induce a photobiomodulatory (PBM) effect on cells and tissues, contributing to a directed modulation of cell behaviors, enhancing the processes of tissue repair. Photobiomodulation (PBM), also known as low-level laser therapy (LLLT), can induce cell proliferation and enhance stem cell differentiation. Laser therapy is a non-invasive method that contributes to pain relief and reduces inflammation, parallel to the enhanced healing and tissue repair processes. The application of these properties was employed and observed in the treatment of various diseases and conditions, such as diabetes, brain injury, spinal cord damage, dermatological conditions, oral irritation, and in different areas of dentistry.
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Matys J, Flieger R, Gedrange T, Janowicz K, Kempisty B, Grzech-Leśniak K, Dominiak M. Effect of 808 nm Semiconductor Laser on the Stability of Orthodontic Micro-Implants: A Split-Mouth Study. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E2265. [PMID: 32423127 PMCID: PMC7287787 DOI: 10.3390/ma13102265] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 05/03/2020] [Accepted: 05/11/2020] [Indexed: 12/15/2022]
Abstract
BACKGROUND To evaluate the effect of photobiomodulation (PBM) on orthodontic micro-implants (n = 44; 14 women, 8 men). METHODS PBM with 808 nm diode laser was applied immediately, 3, 6, 9, 12, 15, and 30 days post the implantation. Results were assessed within same time frames and additionally after 60 days to check for implants stability using the Periotest device. Patients pain experiences following the first day post-treatment and potential loss of micro-implants after 60 days were recorded. The procedure involved insertion of mini-implants in the maxilla for the laser group (L, n = 22) and negative control group (C, n = 22). Irradiation was carried buccally and palatally with respect to the maxillary ridge (2 points). The energy per point was 4 J (8 J/cm2), total dose was 56 J. RESULTS Patients did not report significant differences in terms of pain experiences comparing the L and C groups (p = 0.499). At 30 days post-treatment, higher secondary stability of implants was observed in the laser group (Periotest Test Value, PTV 6.32 ± 3.62), in contrast to the controls (PTV 11.34 ± 5.76) (p = 0.004). At 60 days post-treatment, significantly higher stability was recorded in the laser group (PTV 6.55 ± 4.66) compared with the controls, PTV (10.95 ± 4.77) (p = 0.009). Conclusions: Application of the 808 nm diode laser increased secondary micro-implant stability.
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Affiliation(s)
- Jacek Matys
- Laser Laboratory at Dental Surgery Department, Medical University of Wroclaw, 50-425 Wrocław, Poland;
| | | | - Tomasz Gedrange
- Dental Surgery Department, Medical University of Wroclaw, 50-425 Wrocław, Poland; (T.G.); (M.D.)
- Department of Orthodontics, Technische Universität Dresden, Fetscherstr. 74, 01307 Dresden, Germany
| | - Krzysztof Janowicz
- Department of Anatomy, Poznan University of Medical Sciences, 60-781 Poznan, Poland; (K.J.); (B.K.)
- Department of Histology and Embryology, Poznań University of Medical Sciences, 60-781 Poznań, Poland
| | - Bartosz Kempisty
- Department of Anatomy, Poznan University of Medical Sciences, 60-781 Poznan, Poland; (K.J.); (B.K.)
- Department of Histology and Embryology, Poznań University of Medical Sciences, 60-781 Poznań, Poland
- Department of Obstetrics and Gynaecology, University Hospital and Masaryk University, 602 00 Brno, Czech Republic
- Department of Veterinary Surgery, Institute of Veterinary Medicine, Nicolaus Copernicus University, 87-100 Toruń, Poland
| | - Kinga Grzech-Leśniak
- Laser Laboratory at Dental Surgery Department, Medical University of Wroclaw, 50-425 Wrocław, Poland;
| | - Marzena Dominiak
- Dental Surgery Department, Medical University of Wroclaw, 50-425 Wrocław, Poland; (T.G.); (M.D.)
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Therapeutic Effect of Intense Pulsed Light (IPL) Combined with Meibomian Gland Expression (MGX) on Meibomian Gland Dysfunction (MGD). J Ophthalmol 2020; 2020:3684963. [PMID: 32351719 PMCID: PMC7174928 DOI: 10.1155/2020/3684963] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 03/01/2020] [Accepted: 03/30/2020] [Indexed: 12/15/2022] Open
Abstract
Purpose Our study aimed to evaluate the efficiency of intense pulsed light (IPL) combined with meibomian gland expression (MGX) in treating meibomian gland dysfunction (MGD). Methods This study was a prospective interventional study. A total of 53 patients were included in the study and received a series of three treatments at an interval of 3-4 weeks. Follow-up examinations were completed 4 weeks after the last treatment. The Ocular Surface Disease Index (OSDI) questionnaire, tear meniscus height (TMH), tear break-up time (TBUT), slit-lamp examinations, and in vivo confocal microscopy (IVCM) were recorded before and after treatment. Additionally, an artificial intelligence automated software program was applied in our study for corneal nerve analysis. Results The OSDI score was significantly reduced after the IPL treatment compared with baseline (P < 0.001). Meibomian gland assessment scores, including meibum quality and expressibility, eyelid margin abnormalities, and corneal staining, significantly decreased after treatment (P < 0.05). Moreover, the corneal nerve fiber length (CNFL) significantly increased after the treatment (P < 0.001). Conclusion Intense pulsed light (IPL) combined with MGX is an effective treatment for MGD, and neurotrophism could be one of the mechanisms of IPL.
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Low-Level Laser Therapy with a 635 nm Diode Laser Affects Orthodontic Mini-Implants Stability: A Randomized Clinical Split-Mouth Trial. J Clin Med 2019; 9:jcm9010112. [PMID: 31906190 PMCID: PMC7019927 DOI: 10.3390/jcm9010112] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 12/28/2019] [Accepted: 12/30/2019] [Indexed: 11/17/2022] Open
Abstract
Background: The study aimed to clinically estimate an influence of a 635 nm diode laser on the stability of orthodontic mini-implants, to assess mini-implants loss, and to evaluate a pain level after the treatment. Materials and Methods: The randomized clinical split-mouth trial included 20 subjects (13 women and 7 men; age: 32.5 ± 6.1 years), 40 implants (RMO, West Colfax Ave., Denver, CO, USA) with a diameter 1.4 mm and length of 10 mm. Mini-implants were placed in the area of the attached gingiva between the second premolar and first molar teeth, 2 mm below the mucogingival junction of both sides of the maxilla. Each implant on the right side (G1, n = 20) of the maxilla was irradiated with a diode laser, and the implants on the opposite side (left, G2, n = 20) were a control group (without laser irradiation). The 635-nm laser parameters; dose: 10 J per point (20 J/cm2), time: 100 s per point, two points (irradiation on a buccal, and a palatal side of the alveolus/implant), the total energy per session 20 J. Laser application protocol: immediately and 3, 6, 9, 12, 15, and 30 days after surgery. The total energy after all therapeutic sessions was 140 J. The implants’ stability was measured employing a Periotest device (Periotest Test Value—PTV) immediately and 3, 6, 9, 12, 15, 30, and 60 days after the insertion of the mini-implants. Results: We found significantly higher secondary stability, lower mean PTV (6.18 ± 5.30) and (1.51 ± 2.25), for self-drilling mini-implants (G1, test group) in contrast to the control, G2 group (9.17 ± 8.25) and (5.00 ± 3.24), after 30 (p = 0.0003) and 60 days (p = 0.0000). Moreover, the analysis of the mini-implants stability after 635-nm diode laser application revealed significant higher stability in comparison with none irradiated implants (G2 group) after 3 days. (p = 0.0000) There was no significant difference in pain level measured on the NRS-11 scale on both sides of the maxilla. (p = 0.3665) An important finding was that all inserted mini-implants survived during a two-month observation period. Conclusions: 635-nm diode laser at laser irradiation increases the secondary stability of orthodontic mini-implants.
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Modrak M, Talukder MAH, Gurgenashvili K, Noble M, Elfar JC. Peripheral nerve injury and myelination: Potential therapeutic strategies. J Neurosci Res 2019; 98:780-795. [PMID: 31608497 DOI: 10.1002/jnr.24538] [Citation(s) in RCA: 104] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 08/30/2019] [Accepted: 09/16/2019] [Indexed: 12/11/2022]
Abstract
Traumatic peripheral nerve injury represents a major clinical and public health problem that often leads to significant functional impairment and permanent disability. Despite modern diagnostic procedures and advanced microsurgical techniques, functional recovery after peripheral nerve repair is often unsatisfactory. Therefore, there is an unmet need for new therapeutic or adjunctive strategies to promote the functional recovery in nerve injury patients. In contrast to the central nervous system, Schwann cells in the peripheral nervous system play a pivotal role in several aspects of nerve repair such as degeneration, remyelination, and axonal growth. Several non-surgical approaches, including pharmacological, electrical, cell-based, and laser therapies, have been employed to promote myelination and enhance functional recovery after peripheral nerve injury. This review will succinctly discuss the potential therapeutic strategies in the context of myelination following peripheral neurotrauma.
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Affiliation(s)
- Max Modrak
- School of Medicine & Dentistry, The University of Rochester Medical Center, Rochester, New York, USA
| | - M A Hassan Talukder
- Department of Orthopaedics & Rehabilitation, Penn State Hershey College of Medicine, Milton S. Hershey Medical Center, Hershey, Pennsylvania, USA
| | - Khatuna Gurgenashvili
- Department of Neurology, Penn State Hershey College of Medicine, Milton S. Hershey Medical Center, Hershey, Pennsylvania, USA
| | - Mark Noble
- Department of Biomedical Genetics, The University of Rochester Medical Center, Rochester, New York, USA
| | - John C Elfar
- Department of Orthopaedics & Rehabilitation, Penn State Hershey College of Medicine, Milton S. Hershey Medical Center, Hershey, Pennsylvania, USA
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Micheli L, Cialdai F, Pacini A, Branca JJV, Morbidelli L, Ciccone V, Lucarini E, Ghelardini C, Monici M, Di Cesare Mannelli L. Effect of NIR laser therapy by MLS-MiS source against neuropathic pain in rats: in vivo and ex vivo analysis. Sci Rep 2019; 9:9297. [PMID: 31243320 PMCID: PMC6594937 DOI: 10.1038/s41598-019-45469-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 06/03/2019] [Indexed: 12/26/2022] Open
Abstract
Neuropathic pain is characterized by an uncertain etiology and by a poor response to common therapies. The ineffectiveness and the frequent side effects of the drugs used to counteract neuropathic pain call for the discovery of new therapeutic strategies. Laser therapy proved to be effective for reducing pain sensitivity thus improving the quality of life. However, its application parameters and efficacy in chronic pain must be further analyzed. We investigated the pain relieving and protective effect of Photobiomodulation Therapy in a rat model of compressive mononeuropathy induced by Chronic Constriction Injury of the sciatic nerve (CCI). Laser (MLS-MiS) applications started 7 days after surgery and were performed ten times over a three week period showing a reduction in mechanical hypersensitivity and spontaneous pain that started from the first laser treatment until the end of the experiment. The ex vivo analysis highlighted the protective role of laser through the myelin sheath recovery in the sciatic nerve, inhibition of iNOS expression and enhancement of EAAT-2 levels in the spinal cord. In conclusion, this study supports laser treatment as a future therapeutic strategy in patients suffering from neuropathic pain induced by trauma.
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Affiliation(s)
- Laura Micheli
- Department of Neuroscience, Psychology, Drug Research and Child Health - NEUROFARBA - Pharmacology and Toxicology Section, University of Florence, Florence, Italy
| | - Francesca Cialdai
- ASAcampus Joint Laboratory, ASA Res. Div. - Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Alessandra Pacini
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | | | | | - Valerio Ciccone
- Department of Life Sciences, University of Siena, Siena, Italy
| | - Elena Lucarini
- Department of Neuroscience, Psychology, Drug Research and Child Health - NEUROFARBA - Pharmacology and Toxicology Section, University of Florence, Florence, Italy
| | - Carla Ghelardini
- Department of Neuroscience, Psychology, Drug Research and Child Health - NEUROFARBA - Pharmacology and Toxicology Section, University of Florence, Florence, Italy
| | - Monica Monici
- ASAcampus Joint Laboratory, ASA Res. Div. - Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Lorenzo Di Cesare Mannelli
- Department of Neuroscience, Psychology, Drug Research and Child Health - NEUROFARBA - Pharmacology and Toxicology Section, University of Florence, Florence, Italy.
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Photobiomodulation by a 635nm Diode Laser on Peri-Implant Bone: Primary and Secondary Stability and Bone Density Analysis-A Randomized Clinical Trial. BIOMED RESEARCH INTERNATIONAL 2019; 2019:2785302. [PMID: 31143771 PMCID: PMC6501257 DOI: 10.1155/2019/2785302] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 04/03/2019] [Accepted: 04/10/2019] [Indexed: 11/21/2022]
Abstract
Introduction Various procedures in dental implantology are performed to enhance the bone healing process and implant stability. One of these methods can be a low-level laser therapy (LLLT). Objectives The aim of our study was to evaluate the stabilization (primary and secondary) and bone density in peri-implant zone after LLLT protocol using a 635 nm diode laser. Material and Methods The research included 40 implants placed in the posterior region of a mandible in 24 patients (8 women and 16 man; age: 46.7 ± 8.7 years). The patients were randomly divided into 2 groups G1 (n=12, 18 implants) and G2 (n=12, 22 implants) according to the treatment procedure; G1 (test): 635 nm laser, with handpiece diameter: 8mm, output power: 100mW, spot area: 0.5024cm2, average power density: 199.04mW/cm2, continuous mode, dose: 4J per point (8J/cm2), time: 40 sec per point, 2 points (irradiation on a buccal and a lingual side of the alveolus/implant), and total energy per session 8J; G2 (control): no laser irradiation. The G1 (test) group's implants were irradiated according to the following protocol: 1 day before surgery, immediately after the surgery and 2, 4, 7, and 14 days after. The total energy after all therapeutic sessions was 48J. The implants stability was measured employing a Periotest device (Periotest Test Value: PTV) (measured immediately after the surgery, 7 days, 2 weeks, 4 weeks, and 2 and 3 months after the surgery) and the bone density using cone-beam computed tomography (grayscale value) (measured immediately after the surgery, 4 weeks and 12 weeks after the treatment). Results The average implant stability at different time points showed lower PTV value (higher stability) at 2nd and 4th week after 635 nm laser irradiation (G1) compared with a control (G2) group (p<0.01). The secondary stability of the implants after 12 weeks observation was not significantly higher for the laser group in contrast to none-irradiated implants (p>0.05). The mean grayscale value at the apical, middle, and cervical level of the titanium implants showed the reduction of pixel grayscale value after 2 weeks and was lower for the G1 group in contrast to the G2 group (p<0.01). The value of grayscale after 12 weeks was significantly higher at the middle and apical level of the implants in the G1group in contrast to the G2 group (p<0.01). Conclusion The application of the 635 nm diode laser enhanced secondary implant stability and bone density. However, to assess the impact of the LLLT on peri-implant bone with different bone densities, further well-controlled long-term trials on larger study groups are needed.
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Al-Shammari AM, Syhood Y, Al-Khafaji AS. Use of low-power He-Ne laser therapy to accelerate regeneration processes of injured sciatic nerve in rabbit. THE EGYPTIAN JOURNAL OF NEUROLOGY, PSYCHIATRY AND NEUROSURGERY 2019; 55:1. [PMID: 30679899 PMCID: PMC6320753 DOI: 10.1186/s41983-018-0047-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 12/10/2018] [Indexed: 12/11/2022] Open
Abstract
Background Photostimulation using low-power laser had been used for nervous repair with interesting results. This study aimed to evaluate the influence of 20 mW low-power He-Ne laser on the regeneration of a peripheral sciatic nerve after trauma using the Albino rabbit as an animal model for experimental treatment. Methods Six adult male rabbits were randomly assigned into two equal groups (control- and laser-treated). General anesthesia was administered intramuscularly, and exploration of the sciatic nerve was done in the lateral aspect of the legs. Complete longitudinal and reverse sections of the nerve were performed, which was followed by crushing of the neural sheath. Treatment was carried out directly after the trauma. Irradiation doses of low-level laser therapy (LLLT-31.5 J/cm2) with once a day application for 10 consecutive days and observed for 30 days. The animals were followed up for an extra 2 weeks. Two important factors were examined histopathology and functionality of the nerve. Results Compared to the control group, significant variations in regeneration were observed, including thicker nerve fibers, and more regular myelin layers in the treated group. Conclusions The results of the present study suggest that laser therapy may be a viable approach for nerve regeneration and repair.
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Affiliation(s)
- Ahmed Majeed Al-Shammari
- 1Experimental Therapy Department, Iraqi Center for Cancer and Medical Genetic Research, Mustansiriyah University, Baghdad, 1001 Iraq
| | - Yahya Syhood
- 1Experimental Therapy Department, Iraqi Center for Cancer and Medical Genetic Research, Mustansiriyah University, Baghdad, 1001 Iraq
| | - Ahmed S Al-Khafaji
- 2Department of Biology, College of Science, University of Baghdad, Baghdad, Iraq
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Belykh E, Yagmurlu K, Martirosyan NL, Lei T, Izadyyazdanabadi M, Malik KM, Byvaltsev VA, Nakaji P, Preul MC. Laser application in neurosurgery. Surg Neurol Int 2017; 8:274. [PMID: 29204309 PMCID: PMC5691557 DOI: 10.4103/sni.sni_489_16] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 08/18/2017] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Technological innovations based on light amplification created by stimulated emission of radiation (LASER) have been used extensively in the field of neurosurgery. METHODS We reviewed the medical literature to identify current laser-based technological applications for surgical, diagnostic, and therapeutic uses in neurosurgery. RESULTS Surgical applications of laser technology reported in the literature include percutaneous laser ablation of brain tissue, the use of surgical lasers in open and endoscopic cranial surgeries, laser-assisted microanastomosis, and photodynamic therapy for brain tumors. Laser systems are also used for intervertebral disk degeneration treatment, therapeutic applications of laser energy for transcranial laser therapy and nerve regeneration, and novel diagnostic laser-based technologies (e.g., laser scanning endomicroscopy and Raman spectroscopy) that are used for interrogation of pathological tissue. CONCLUSION Despite controversy over the use of lasers for treatment, the surgical application of lasers for minimally invasive procedures shows promising results and merits further investigation. Laser-based microscopy imaging devices have been developed and miniaturized to be used intraoperatively for rapid pathological diagnosis. The multitude of ways that lasers are used in neurosurgery and in related neuroclinical situations is a testament to the technological advancements and practicality of laser science.
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Affiliation(s)
- Evgenii Belykh
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
- Department of Neurosurgery, Irkutsk State Medical University, Irkutsk, Russia
- School of Life Sciences, Arizona State University, Tempe, Arizona, USA
| | - Kaan Yagmurlu
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Nikolay L. Martirosyan
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Ting Lei
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Mohammadhassan Izadyyazdanabadi
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
- School of Life Sciences, Arizona State University, Tempe, Arizona, USA
| | - Kashif M. Malik
- University of Arizona College of Medicine, Tucson, Arizona, USA
| | - Vadim A. Byvaltsev
- Department of Neurosurgery, Irkutsk State Medical University, Irkutsk, Russia
| | - Peter Nakaji
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Mark C. Preul
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
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Torkzaban P, Kasraei S, Torabi S, Farhadian M. Low-level laser therapy with 940 nm diode laser on stability of dental implants: a randomized controlled clinical trial. Lasers Med Sci 2017; 33:287-293. [PMID: 29082462 DOI: 10.1007/s10103-017-2365-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 10/17/2017] [Indexed: 11/29/2022]
Abstract
Low-level laser therapy (LLLT) is a non-invasive modality to promote osteoblastic activity and tissue healing. The aim of this study was to evaluate the efficacy of LLLT for improvement of dental implant stability. This randomized controlled clinical trial was performed on 80 dental implants placed in 19 patients. Implants were randomly divided into two groups (n = 40). Seven sessions of LLLT (940 nm diode laser) were scheduled for the test group implants during 2 weeks. Laser was irradiated to the buccal and palatal sides. The same procedure was performed for the control group implants with laser hand piece in "off" mode. Implant stability was measured by Osstell Mentor device in implant stability quotient (ISQ) value immediately after surgery and 10 days and 3, 6, and 12 weeks later. Repeated measures ANOVA was used to compare the mean ISQ values (implant stability) in the test and control groups. Statistical test revealed no significant difference in the mean values of implant stability between the test and control groups over time (P = 0.557). Although the mean values of implant stability changed significantly in both groups over time (P < 0.05). Although the trend of reduction in stability was slower in the laser group in the first weeks and increased from the 6th to 12th week, LLLT had no significant effect on dental implant stability.
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Affiliation(s)
- Parviz Torkzaban
- Dental Research Center, Department of Periodontics, Dental School, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Shahin Kasraei
- Department of Restorative Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Sara Torabi
- Department of Periodontics, Dental School, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Maryam Farhadian
- Modeling of Noncommunicable Disease Research Center, Department of Biostatistics, Hamadan University of Medical Sciences, Hamadan, Iran
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Effects of photobiomodulation on experimental models of peripheral nerve injury. Lasers Med Sci 2017; 32:2155-2165. [DOI: 10.1007/s10103-017-2359-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Accepted: 10/10/2017] [Indexed: 10/18/2022]
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Jiang B, Zhang Y, She C, Zhao J, Zhou K, Zuo Z, Zhou X, Wang P, Dong Q. X-ray irradiation has positive effects for the recovery of peripheral nerve injury maybe through the vascular smooth muscle contraction signaling pathway. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2017; 54:177-183. [PMID: 28755625 DOI: 10.1016/j.etap.2017.07.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 07/17/2017] [Accepted: 07/18/2017] [Indexed: 06/07/2023]
Abstract
INTRODUCTION It is well known that moderate to high doses of ionizing radiation have a toxic effect on the organism. However, there are few experimental studies on the mechanisms of LDR ionizing radiation on nerve regeneration after peripheral nerve injury. METHODS We established the rats' peripheral nerve injury model via repaired Peripheral nerve injury nerve, vascular endothelial growth factor a and Growth associated protein-43 were detected from different treatment groups. We performed transcriptome sequencing focusing on investigating the differentially expressed genes and gene functions between the control group and 1Gy group. Sequencing was done by using high-throughput RNA-sequencing (RNA-seq) technologies. RESULTS The results showed the 1Gy group to be the most effective promoting repair. RNA-sequencing identified 619 differently expressed genes between control and treated groups. A Gene Ontology analysis of the differentially expressed genes revealed enrichment in the functional pathways. Among them, candidate genes associated with nerve repair were identified. DISCUSSION Pathways involved in cell-substrate adhesion, vascular smooth muscle contraction and cell adhesion molecule signaling may be involved in recovery from peripheral nerve injury.
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Affiliation(s)
- Bo Jiang
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China
| | - Yong Zhang
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China
| | - Chang She
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China; Department of Orthopedics, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China.
| | - Jiaju Zhao
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China
| | - Kailong Zhou
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China
| | - Zhicheng Zuo
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China
| | - Xiaozhong Zhou
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China; Department of Orthopedics, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China.
| | - Peiji Wang
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China
| | - Qirong Dong
- Department of Orthopedics, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Suzhou, Jiangsu 215004, China.
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Buchaim DV, Andreo JC, Ferreira Junior RS, Barraviera B, Rodrigues ADC, Macedo MDC, Rosa Junior GM, Shinohara AL, Santos German IJ, Pomini KT, Buchaim RL. Efficacy of Laser Photobiomodulation on Morphological and Functional Repair of the Facial Nerve. Photomed Laser Surg 2017; 35:442-449. [PMID: 28557664 DOI: 10.1089/pho.2016.4204] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
OBJECTIVE Evaluate the efficacy of low-level laser therapy (LLLT) on qualitative, quantitative, and functional aspects in the facial nerve regeneration process. MATERIALS AND METHODS Forty-two male Wistar rats were used, randomly divided into a control group (CG; n = 10), in which the facial nerve without lesion was collected, and four experimental groups: (1) suture experimental group (SEG) and (2) fibrin experimental group (FEG), consisting of 16 animals in which the buccal branch of the facial nerve was sectioned on both sides of the face; an end-to-end epineural suture was performed on the right side, and a fibrin sealant was used on the left side for coaptation of the stumps; and (3) laser suture experimental group (LSEG) and (4) laser fibrin experimental group (LFEG), consisting of 16 animals that underwent the same surgical procedures as SEG and FEG with the addition of laser application at three different points along the surgical site (pulsed laser of 830 nm wavelength, optical output power of 30 mW, power density of 0.2586 W/cm2, energy density of 6.2 J/cm2, beam area of 0.116 cm2, exposure time of 24 sec per point, total energy per session of 2.16 J, and cumulative dose of 34.56 J). The animals were submitted to functional analysis (subjective observation of whisker movement) and the data obtained were compared using Fisher's exact test. Euthanasia was performed at 5 and 10 weeks postoperative. The total number and density of regenerated axons were analyzed using the unpaired t-test (p < 0.05). RESULTS Laser therapy resulted in a significant increase in the number and density of regenerated axons. The LSEG and LFEG presented better scores in functional analysis in comparison with the SEG and FEG. CONCLUSIONS LLLT enhanced axonal regeneration and accelerated functional recovery of the whiskers, and both repair techniques allowed the growth of axons.
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Affiliation(s)
| | - Jesus Carlos Andreo
- 2 Department of Biological Sciences (Anatomy), Bauru School of Dentistry, University of São Paulo , Bauru, Brazil
| | - Rui Seabra Ferreira Junior
- 3 Center for the Study of Venoms and Venomous Animals, São Paulo State University (UNESP-Univ Estadual Paulista) , Botucatu, Brazil
| | - Benedito Barraviera
- 3 Center for the Study of Venoms and Venomous Animals, São Paulo State University (UNESP-Univ Estadual Paulista) , Botucatu, Brazil
| | - Antonio de Castro Rodrigues
- 2 Department of Biological Sciences (Anatomy), Bauru School of Dentistry, University of São Paulo , Bauru, Brazil
| | - Mariana de Cássia Macedo
- 2 Department of Biological Sciences (Anatomy), Bauru School of Dentistry, University of São Paulo , Bauru, Brazil
| | | | - Andre Luis Shinohara
- 2 Department of Biological Sciences (Anatomy), Bauru School of Dentistry, University of São Paulo , Bauru, Brazil
| | - Iris Jasmin Santos German
- 2 Department of Biological Sciences (Anatomy), Bauru School of Dentistry, University of São Paulo , Bauru, Brazil
| | - Karina Torres Pomini
- 2 Department of Biological Sciences (Anatomy), Bauru School of Dentistry, University of São Paulo , Bauru, Brazil
| | - Rogerio Leone Buchaim
- 2 Department of Biological Sciences (Anatomy), Bauru School of Dentistry, University of São Paulo , Bauru, Brazil
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Sasaki RT, Grossi NG, Zeni RT, Saez DM, Gonçalves ID, da Silva MCP. Effect of Laser Photobiomodulation with Gradual or Constant Doses in the Regeneration of Rats' Mental Nerve After Lesion by Compression. Photomed Laser Surg 2017; 35:408-414. [PMID: 28358662 DOI: 10.1089/pho.2016.4210] [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: 01/12/2023] Open
Abstract
OBJECTIVE Assess morphologically the efficacy of constant dose (CD) or gradual dose (GD) in photobiomodulation therapy (PBMT) during the regeneration process of rats' mental nerve after compression lesion. MATERIALS AND METHODS Forty-eight male Wistar rats were used and divided into four groups (n = 12): negative control (NC): lesion by compression; positive control (PC): no lesion; GD: lesion by compression and PBMT with GD; and CD: lesion by compression and PBMT with CD. One day after the surgery, the groups GD and CD underwent PBMT daily in three equidistant points around the incision area. The parameters were wavelength of 808 nm, 100 mW, CD received treatment with 120 J/cm2, while GD underwent the protocol of application: 1st and 4th sessions: 80 J/cm2; 5th to 8th sessions: 90 J/cm2; 9th to 12th sessions: 100 J/cm2; 13th to 16th sessions: 110 J/cm2; and 17th to 20th sessions: 120 J/cm2. Euthanasias were performed at 3, 7, 14, and 21 days. Qualitative and quantitative analysis of the mental nerves were performed with ANOVA (analysis of variance) and Tukey tests (p ≤ 0.05). RESULTS It was observed that PBMT was able to accelerate the process of nerve regeneration presenting an increase in the number of myelinated fibers starting at 14 days of treatment for groups CD and GD, and at 21 days they were similar to PC. It was observed a better lamellar organization of myelin sheath at 7 days for GD and at 14 days for CD, similar to PC. Both GD and CD presented significant differences compared to NC and PC for thickness of the myelin sheath, outer perimeter, internal area, and number of myelin fibers. CONCLUSIONS PBMT presented positive effect on the regeneration of nerve starting at 14 days, and after 21 days there was no difference between GD and CD.
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Affiliation(s)
- Robson Tetsuo Sasaki
- 1 Department of Morphology and Genetics, Federal University of São Paulo (EPM/UNIFESP) , São Paulo, Brazil
| | - Natália Garrido Grossi
- 2 Department of Human Anatomy, São Leopoldo Mandic Institute and Research Center , Campinas, Brazil
| | - Rafael Tardeli Zeni
- 2 Department of Human Anatomy, São Leopoldo Mandic Institute and Research Center , Campinas, Brazil
| | - Daniel Martinez Saez
- 1 Department of Morphology and Genetics, Federal University of São Paulo (EPM/UNIFESP) , São Paulo, Brazil
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Antonić R, Brumini M, Vidović I, Muhvić Urek M, Glažar I, Pezelj-Ribarić S. he effects of low level laser therapy on the management of chronic idiopathic orofacial pain: trigeminal neuralgia, temporomandibular disorders and burning mouth syndrome. ACTA ACUST UNITED AC 2017. [DOI: 10.21860/medflum2017_173373] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Clinical effectiveness of low-level laser treatment on peripheral somatosensory neuropathy. Lasers Med Sci 2017; 32:721-728. [DOI: 10.1007/s10103-016-2137-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 12/26/2016] [Indexed: 12/12/2022]
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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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Lee JH, Chang SY, Moy WJ, Oh C, Kim SH, Rhee CK, Ahn JC, Chung PS, Jung JY, Lee MY. Simultaneous bilateral laser therapy accelerates recovery after noise-induced hearing loss in a rat model. PeerJ 2016; 4:e2252. [PMID: 27547558 PMCID: PMC4963219 DOI: 10.7717/peerj.2252] [Citation(s) in RCA: 251] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 06/23/2016] [Indexed: 11/22/2022] Open
Abstract
Noise-induced hearing loss is a common type of hearing loss. The effects of laser therapy have been investigated from various perspectives, including in wound healing, inflammation reduction, and nerve regeneration, as well as in hearing research. A promising feature of the laser is its capability to penetrate soft tissue; depending on the wavelength, laser energy can penetrate into the deepest part of the body without damaging non-target soft tissues. Based on this idea, we developed bilateral transtympanic laser therapy, which uses simultaneous laser irradiation in both ears, and evaluated the effects of bilateral laser therapy on cochlear damage caused by noise overexposure. Thus, the purpose of this research was to assess the benefits of simultaneous bilateral laser therapy compared with unilateral laser therapy and a control. Eighteen Sprague-Dawley rats were exposed to narrow-band noise at 115 dB SPL for 6 h. Multiple auditory brainstem responses were measured after each laser irradiation, and cochlear hair cells were counted after the 15th such irradiation. The penetration depth of the 808 nm laser was also measured after sacrifice. Approximately 5% of the laser energy reached the contralateral cochlea. Both bilateral and unilateral laser therapy decreased the hearing threshold after noise overstimulation in the rat model. The bilateral laser therapy group showed faster functional recovery at all tested frequencies compared with the unilateral laser therapy group. However, there was no difference in the endpoint ABR results or final hair cell survival, which was analyzed histologically.
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Affiliation(s)
- Jae-Hun Lee
- College of Medicine, Dankook University, Beckman Laser Institute Korea , Cheonan , South Korea
| | - So-Young Chang
- College of Medicine, Dankook University, Beckman Laser Institute Korea , Cheonan , South Korea
| | - Wesley J Moy
- Beckman Laser Institute and Medical Clinic, University of California , Irvine , CA , United States
| | - Connie Oh
- Beckman Laser Institute and Medical Clinic, University of California , Irvine , CA , United States
| | - Se-Hyung Kim
- Department of Otolaryngology-Head and Neck Surgery, Jeju National University School of Medicine , Jeju , South Korea
| | - Chung-Ku Rhee
- Department of Otolaryngology-Head & Neck Surgery, College of Medicine, Dankook University , Cheonan , South Korea
| | - Jin-Chul Ahn
- Department of Biomedical Science, College of Medicine, Dankook University , Cheonan , South Korea
| | - Phil-Sang Chung
- College of Medicine, Dankook University, Beckman Laser Institute Korea, Cheonan, South Korea; Department of Otolaryngology-Head & Neck Surgery, College of Medicine, Dankook University, Cheonan, South Korea
| | - Jae Yun Jung
- College of Medicine, Dankook University, Beckman Laser Institute Korea, Cheonan, South Korea; Department of Otolaryngology-Head & Neck Surgery, College of Medicine, Dankook University, Cheonan, South Korea
| | - Min Young Lee
- Department of Otolaryngology-Head & Neck Surgery, College of Medicine, Dankook University , Cheonan , South Korea
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Kathuria V, Dhillon JK, Kalra G. Low Level Laser Therapy: A Panacea for oral maladies. Laser Ther 2015; 24:215-23. [PMID: 26557737 DOI: 10.5978/islsm.15-ra-01] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
AIM To review the applications of low level laser therapy on various soft and hard oral tissues. A variety of therapeutic effects of Low Level Laser Therapy have been reported on a broad range of disorders. It has been found amenably practical in dental applications including soft as well as hard tissues of the oral cavity. LLLT has been found to be efficient in acceleration of wound healing, enhanced remodelling and bone repair, regeneration of neural cells following injury, pain attenuation, endorphin release stimulation and modulation of immune system. The aforementioned biological processes induced by Low level lasers have been effectively applied in treating various pathological conditions in the oral cavity. With is article, we attempt to review the possible application of Low Laser Therapy in the field of dentistry.
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Affiliation(s)
- Vartika Kathuria
- Centre for Dental Education and Research, All India Institute of Medical Sciencese
| | | | - Gauri Kalra
- Division of Pedodontics & Preventive Dentistry, Clove Pental Pvt Ltd
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Takhtfooladi MA, Sharifi D. A comparative study of red and blue light-emitting diodes and low-level laser in regeneration of the transected sciatic nerve after an end to end neurorrhaphy in rabbits. Lasers Med Sci 2015; 30:2319-24. [PMID: 26415928 DOI: 10.1007/s10103-015-1813-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 09/21/2015] [Indexed: 01/22/2023]
Abstract
This study aimed at evaluating the effects of red and blue light-emitting diodes (LED) and low-level laser (LLL) on the regeneration of the transected sciatic nerve after an end-to-end neurorrhaphy in rabbits. Forty healthy mature male New Zealand rabbits were randomly assigned into four experimental groups: control, LLL (680 nm), red LED (650 nm), and blue LED (450 nm). All animals underwent the right sciatic nerve neurotmesis injury under general anesthesia and end-to-end anastomosis. The phototherapy was initiated on the first postoperative day and lasted for 14 consecutive days at the same time of the day. On the 30th day post-surgery, the animals whose sciatic nerves were harvested for histopathological analysis were euthanized. The nerves were analyzed and quantified the following findings: Schwann cells, large myelinic axons, and neurons. In the LLL group, as compared to other groups, an increase in the number of all analyzed aspects was observed with significance level (P < 0.05). This finding suggests that postoperative LLL irradiation was able to accelerate and potentialize the peripheral nerve regeneration process in rabbits within 14 days of irradiation.
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Affiliation(s)
| | - Davood Sharifi
- Department of Surgery and Radiology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
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Kasai K, Yuching Chou M, Yamaguchi M. Molecular effects of low-energy laser irradiation during orthodontic tooth movement. Semin Orthod 2015. [DOI: 10.1053/j.sodo.2015.06.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Buchaim RL, Andreo JC, Barraviera B, Ferreira Junior RS, Buchaim DV, Rosa Junior GM, de Oliveira ALR, de Castro Rodrigues A. Effect of low-level laser therapy (LLLT) on peripheral nerve regeneration using fibrin glue derived from snake venom. Injury 2015; 46:655-60. [PMID: 25669962 DOI: 10.1016/j.injury.2015.01.031] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 01/09/2015] [Accepted: 01/19/2015] [Indexed: 02/02/2023]
Abstract
OBJECTIVES The purpose of this study was to assess whether the adhesive permits the collateral repair of axons originating from a vagus nerve to the interior of a sural nerve graft, and whether low-level laser therapy (LLLT) assists in the regeneration process. MATERIALS AND METHODS Study sample consisted of 32 rats randomly separated into three groups: Control Group (CG; n=8), from which the intact sural nerve was collected; Experimental Group (EG; n=12), in which one of the ends of the sural nerve graft was coapted to the vagus nerve using the fibrin glue; and Experimental Group Laser (EGL; n=12), in which the animals underwent the same procedures as those in EG with the addition of LLLT. Ten weeks after surgery, the animals were euthanized. Morphological analysis by means of optical and electron microscopy, and morphometry of the regenerated fibers were employed to evaluate the results. RESULTS Collateral regeneration of axons was observed from the vagus nerve to the interior of the autologous graft in EG and EGL, and in CG all dimensions measured were greater and presented a significant difference in relation to EG and EGL, except for the area and thickness of the myelin sheath, that showed significant difference only in relation to the EG. CONCLUSIONS The present study demonstrated that the fibrin glue makes axonal regeneration feasible and is an efficient method to recover injured peripheral nerves, and the use of low-level laser therapy enhances nerve regeneration.
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Affiliation(s)
- Rogerio Leone Buchaim
- Department of Biological Sciences, Bauru School of Dentistry, University of Sao Paulo, Bauru, SP, Brazil.
| | - Jesus Carlos Andreo
- Department of Biological Sciences, Bauru School of Dentistry, University of Sao Paulo, Bauru, SP, Brazil
| | - Benedito Barraviera
- The Center for the Study of Venoms and Venomous Animals, UNESP, Botucatu, SP, Brazil
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Giuliani A, Lorenzini L, Alessandri M, Torricella R, Baldassarro VA, Giardino L, Calzà L. In vitro exposure to very low-level laser modifies expression level of extracellular matrix protein RNAs and mitochondria dynamics in mouse embryonic fibroblasts. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2015; 15:78. [PMID: 25886934 PMCID: PMC4387590 DOI: 10.1186/s12906-015-0593-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 02/26/2015] [Indexed: 12/16/2022]
Abstract
Background Low-level lasers working at 633 or 670 nm and emitting extremely low power densities (Ultra Low Level Lasers - ULLL) exert an overall effect of photobiostimulation on cellular metabolism and energy balance. In previous studies, it was demonstrated that ULLL pulsed emission mode regulates neurite elongation in vitro and exerts protective action against oxidative stress. Methods In this study the action of ULLL supplied in both pulsed and continuous mode vs continuous LLL on fibroblast cultures (Mouse Embryonic Fibroblast-MEF) was tested, focusing on mitochondria network and the expression level of mRNA encoding for proteins involved in the cell-matrix adhesion. Results It was shown that ULLL at 670 nm, at extremely low average power output (0.21 mW/ cm2) and dose (4.3 mJ/ cm2), when dispensed in pulsed mode (PW), but not in continuous mode (CW) supplied at both at very low (0.21 mW/cm2) and low levels (500 mW/cm2), modifies mitochondria network dynamics, as well as expression level of mRNA encoding for selective matrix proteins in MEF, e.g. collagen type 1α1 and integrin α5. Conclusions We suggest that pulsatility, but not energy density, is crucial in regulating expression level of collagen I and integrin α5 in fibroblasts by ULLL.
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Ng SY, Chu MHE. Treatment of Bell's Palsy Using Monochromatic Infrared Energy: A Report of 2 Cases. J Chiropr Med 2015; 13:96-103. [PMID: 25685117 DOI: 10.1016/j.jcm.2014.06.010] [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: 11/15/2013] [Revised: 03/19/2014] [Accepted: 04/14/2014] [Indexed: 10/25/2022] Open
Abstract
OBJECTIVE The purpose of the study is to describe the use of monochromatic infrared energy (MIRE) therapy in the management of 2 patients with Bell's palsy. CLINICAL FEATURES Two patients presented to a chiropractic clinic with Bell's palsy that was diagnosed by a medical physician. Both patients were treated using MIRE. The acute patient was a 32-year-old male. He presented with left facial palsy 1 day before the consultation. He was unable to puff the left cheek and close the left eyelid. He had difficulty raising the left eyebrow. The chronic case was a 46-year-old lady. Prior to the first consultation, she was treated with corticosteroid and electro-acupuncture for one and a half years, with incomplete recovery. When first seen, the left corner of mouth drooped and she had difficulty raising her left eyebrow. INTERVENTION AND OUTCOME Monochromatic infrared energy therapy, emitting 890 nm infrared light, was placed on the post-auricular area, pre-auricular area, the temple and mandibular area of the affected side. Each treatment lasted 30 minutes. Photographs were taken every week to document changes. The acute case received 19 treatments in 6 weeks. He reported an improvement of 95%. The chronic case received a total of 45 treatments in 9 months. She rated an improvement of 50%. At the conclusion of treatment, she was able to close her left eyelid and puff her left cheek but still could not raise her left eyebrow. CONCLUSION These 2 patients seemed to respond to a different degree to the MIRE therapy. As 71% of patients with Bell's palsy recover uneventfully without any treatment, the present study describes the course of care but cannot confirm the effectiveness of MIRE therapy in the management of Bell's palsy.
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Affiliation(s)
- Shu Yan Ng
- Private practice, Wanchai Chiropractic Clinic, Hong Kong, China
| | - Ming Him E Chu
- Private practice, Wanchai Chiropractic Clinic, Hong Kong, China
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Hwang MH, Shin JH, Kim KS, Yoo CM, Jo GE, Kim JH, Choi H. Low Level Light Therapy Modulates Inflammatory Mediators Secreted by Human Annulus Fibrosus Cells during Intervertebral Disc DegenerationIn Vitro. Photochem Photobiol 2015; 91:403-10. [DOI: 10.1111/php.12415] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 12/09/2014] [Indexed: 01/05/2023]
Affiliation(s)
- Min Ho Hwang
- Department of Medical Sciences; Graduate School of Medicine; Korea University; Seoul South Korea
| | - Jae Hee Shin
- Department of Medical Sciences; Graduate School of Medicine; Korea University; Seoul South Korea
| | - Kyoung Soo Kim
- Department of Medical Sciences; Graduate School of Medicine; Korea University; Seoul South Korea
| | - Chang Min Yoo
- Department of Medical Sciences; Graduate School of Medicine; Korea University; Seoul South Korea
| | - Ga Eun Jo
- Department of Medical Sciences; Graduate School of Medicine; Korea University; Seoul South Korea
| | - Joo Han Kim
- Department of Neurosurgery; Guro Hospital; College of Medicine; Korea University; Seoul South Korea
| | - Hyuk Choi
- Department of Medical Sciences; Graduate School of Medicine; Korea University; Seoul South Korea
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Takhtfooladi MA, Jahanbakhsh F, Takhtfooladi HA, Yousefi K, Allahverdi A. Effect of low-level laser therapy (685 nm, 3 J/cm(2)) on functional recovery of the sciatic nerve in rats following crushing lesion. Lasers Med Sci 2015; 30:1047-52. [PMID: 25595127 DOI: 10.1007/s10103-015-1709-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 01/05/2015] [Indexed: 11/30/2022]
Abstract
Previous studies have shown that low-level laser therapy (LLLT) promotes posttraumatic nerve regeneration. The objective of the present study was to assess the efficacy of 685-nm LLLT at the dosage of 3 J/cm(2) in the functional recovery of the sciatic nerve in rats following crushing injury. The left sciatic nerves of 20 male Wistar rats were subjected to controlled crush injury by a hemostatic tweezers, and the rats were randomly allocated into two experimental groups as follows: control group and laser group. Laser irradiation (685 nm wavelength; 15 mW, CW, 3 J/cm(2), spot of 0.028 cm(2)) was started on the postsurgical first day, above the site of injury, and was continued for 21 consecutive days. Functional recovery was evaluated at 3 weeks postoperatively by measuring the sciatic functional index (SFI) and sciatic static index (SSI) at weekly intervals. The treated rats showed improvement in motion pattern. The SFI and SSI results were significant when comparing two groups on the 14th and 21st postoperative days (p < 0.05). There were intra-group differences detected in laser group in different periods (p < 0.05). Low-level laser irradiation, with the parameters used in the present study, accelerated and improved sciatic nerve function in rats after crushing injury.
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Affiliation(s)
- Vartika Kathuria
- Centre for Dental Education and Research, All India Institute of Medical Sciencese
| | | | - Gauri Kalra
- Division of Pedodontics & Preventive Dentistry, Clove Pental Pvt Ltd
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Weber JBB, Mayer L, Cenci RA, Baraldi CE, Ponzoni D, Gerhardt de Oliveira M. Effect of Three Different Protocols of Low-Level Laser Therapy on Thyroid Hormone Production After Dental Implant Placement in an Experimental Rabbit Model. Photomed Laser Surg 2014; 32:612-7. [DOI: 10.1089/pho.2014.3756] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | - Luciano Mayer
- School of Dentistry, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - Rodrigo Alberto Cenci
- School of Dentistry, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - Carlos Eduardo Baraldi
- School of Dentistry, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Deise Ponzoni
- School of Dentistry, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Marília Gerhardt de Oliveira
- Maxillofacial Surgery Service, Hospital Cristo Redentor – Grupo Hospitalar Conceição (GHC), Porto Alegre, RS, Brazil
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Low-level laser therapy improves peri-implant bone formation: resonance frequency, electron microscopy, and stereology findings in a rabbit model. Int J Oral Maxillofac Surg 2014; 44:245-51. [PMID: 25282596 DOI: 10.1016/j.ijom.2014.09.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 06/01/2014] [Accepted: 09/11/2014] [Indexed: 12/17/2022]
Abstract
Previous studies have reported positive effects of low-level laser therapy (LLLT) on bone healing. This study evaluated the effects of LLLT on peri-implant healing in vivo. Thirty-two rabbits had their mandibular left incisors removed, followed by immediate insertion of a dental implant into the fresh socket. Animals were assigned randomly to four groups: control (non-irradiated) or LLLT at three different doses per session: 5J/cm(2), 10J/cm(2), and 20J/cm(2). A GaAlAs laser (830nm, 50mW) was applied every 48h for 13 days, starting immediately after surgery. The implant stability quotient (ISQ) was measured using resonance frequency analysis upon implant insertion and immediately after death, 30 days after the last application. Tissues were prepared for scanning electron microscopy (SEM) and stereology. Variables measured were bone-implant contact (BIC) and bone neoformation within implant threads at three different sites. The results showed better ISQ for the 20J/cm(2) group (P=0.003). BIC values were significantly higher (P<0.05) in the 20J/cm(2) group, on both SEM and stereology. Bone area values were better in the 10J/cm(2) (P=0.036) and 20J/cm(2) (P=0.016) groups compared to the control group. Under these conditions, LLLT enhanced peri-implant bone repair, improving stability, BIC, and bone neoformation. The findings support and suggest parameters for the design of clinical trials using LLLT after implant placement.
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Abstract
OBJECTIVE Postherpetic neuralgia (PHN) is a neuropathic sequelae in 8% to 27% of individuals with prior varicella zoster virus infection and herpes zoster resulting in retrograde demyelination, neurotoxic reactive oxygen species levels, and proinflammatory cytokine activation of microglia. Pain management strategies are well documented, but not always effective. Laser therapy has shown utility in nerve injury-related pain disorders and was considered a potentially efficacious intervention. DESIGN Case report. METHODS Class 4 therapeutic laser treatment was applied with a dual wavelength GaAlAs (810 nm), GaAl (980 nm) laser, 2 to 4 W, 50% duty cycle, 10 Hz pulse active phase, 2.5 cm diameter aperture, scanning technique with skin contact, 10-minute treatment, 600 to 1200 J total, energy density of 3.5 to 7.1 J/cm average per session, and power density from 0.41 to 0.82 W/cm for 8 treatments. Outcome measures included the Neuropathy Pain Scale Questionnaire as the primary outcome measure, with the Numeric Pain Scale and total area of allodynia touch sensitivity as secondary outcome measurements. RESULTS The author reports a case of PHN of 15-year duration resistant to prior interventions. Weekly laser therapy treatment over 8 weeks resulted in reduced 0 to 10 Numeric Pain Scale score from 8 to 0, Neuropathy Pain Scale Questionnaire total score from 39 to 4, and allodynia over a 60 cm surface area of the upper trunk and posterior arm totally resolved, with resolution continued at 14-month follow-up. DISCUSSION Theoretically, laser therapy induced tissue changes in this case occurring at and below the skin surface altering inflammatory and excitatory peripheral mechanisms noted to take place in the PHN patient. Peripheral nociceptor firing must be brought back to normal thresholds to resolve such chronic neuropathic pain and inhibit the possible central sensitization component. Anti-inflammatory cytokines, growth factors, nitric oxide, adenosine triphosphate (ATP), and other mechanisms stimulated by laser therapy as noted in medical literature may be central to the favorable response seen in this patient. Controlled clinical trials of class 4 laser therapy in the PHN patient population with similar doses would be beneficial to determine if this is an effective treatment option in PHN.
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Wang CZ, Chen YJ, Wang YH, Yeh ML, Huang MH, Ho ML, Liang JI, Chen CH. Low-level laser irradiation improves functional recovery and nerve regeneration in sciatic nerve crush rat injury model. PLoS One 2014; 9:e103348. [PMID: 25119457 PMCID: PMC4131879 DOI: 10.1371/journal.pone.0103348] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2014] [Accepted: 06/27/2014] [Indexed: 12/21/2022] Open
Abstract
The development of noninvasive approaches to facilitate the regeneration of post-traumatic nerve injury is important for clinical rehabilitation. In this study, we investigated the effective dose of noninvasive 808-nm low-level laser therapy (LLLT) on sciatic nerve crush rat injury model. Thirty-six male Sprague Dawley rats were divided into 6 experimental groups: a normal group with or without 808-nm LLLT at 8 J/cm2 and a sciatic nerve crush injury group with or without 808-nm LLLT at 3, 8 or 15 J/cm2. Rats were given consecutive transcutaneous LLLT at the crush site and sacrificed 20 days after the crush injury. Functional assessments of nerve regeneration were analyzed using the sciatic functional index (SFI) and hindlimb range of motion (ROM). Nerve regeneration was investigated by measuring the myelin sheath thickness of the sciatic nerve using transmission electron microscopy (TEM) and by analyzing the expression of growth-associated protein 43 (GAP43) in sciatic nerve using western blot and immunofluorescence staining. We found that sciatic-injured rats that were irradiated with LLLT at both 3 and 8 J/cm2 had significantly improved SFI but that a significant improvement of ROM was only found in rats with LLLT at 8 J/cm2. Furthermore, the myelin sheath thickness and GAP43 expression levels were significantly enhanced in sciatic nerve-crushed rats receiving 808-nm LLLT at 3 and 8 J/cm2. Taken together, these results suggest that 808-nm LLLT at a low energy density (3 J/cm2 and 8 J/cm2) is capable of enhancing sciatic nerve regeneration following a crush injury.
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Affiliation(s)
- Chau-Zen Wang
- Department of Physiology, Kaohsiung Medical University, Kaohsiung, Taiwan
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yi-Jen Chen
- Department of Physical Medicine and Rehabilitation, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- Department of Physical Medicine and Rehabilitation, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yan-Hsiung Wang
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ming-Long Yeh
- Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan
| | - Mao-Hsiung Huang
- Department of Physical Medicine and Rehabilitation, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- Department of Physical Medicine and Rehabilitation, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Mei-Ling Ho
- Department of Physiology, Kaohsiung Medical University, Kaohsiung, Taiwan
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Jen-I Liang
- Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan
| | - Chia-Hsin Chen
- Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Physical Medicine and Rehabilitation, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- Department of Physical Medicine and Rehabilitation, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Physical Medicine and Rehabilitation, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- * E-mail:
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Chen YJ, Wang YH, Wang CZ, Ho ML, Kuo PL, Huang MH, Chen CH. Effect of low level laser therapy on chronic compression of the dorsal root ganglion. PLoS One 2014; 9:e89894. [PMID: 24594641 PMCID: PMC3942382 DOI: 10.1371/journal.pone.0089894] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2013] [Accepted: 01/28/2014] [Indexed: 11/18/2022] Open
Abstract
Dorsal root ganglia (DRG) are vulnerable to physical injury of the intervertebral foramen, and chronic compression of the DRG (CCD) an result in nerve root damage with persistent morbidity. The purpose of this study was to evaluate the effects of low level laser therapy (LLLT) on the DRG in a CCD model and to determine the mechanisms underlying these effects. CCD rats had L-shaped stainless-steel rods inserted into the fourth and fifth lumbar intervertebral foramen, and the rats were then subjected to 0 or 8 J/cm2 LLLT for 8 consecutive days following CCD surgery. Pain and heat stimuli were applied to test for hyperalgesia following CCD. The levels of TNF-α, IL-1β and growth-associated protein-43 (GAP-43) messenger RNA (mRNA) expression were measured via real-time PCR, and protein expression levels were analyzed through immunohistochemical analyses. Our data indicate that LLLT significantly decreased the tolerable sensitivity to pain and heat stimuli in the CCD groups. The expression levels of the pro-inflammatory cytokines TNF-α and IL-1β were increased following CCD, and we found that these increases could be reduced by the application of LLLT. Furthermore, the expression of GAP-43 was enhanced by LLLT. In conclusion, LLLT was able to enhance neural regeneration in rats following CCD and improve rat ambulatory behavior. The therapeutic effects of LLLT on the DRG during CCD may be exerted through suppression of the inflammatory response and induction of neuronal repair genes. These results suggest potential clinical applications for LLLT in the treatment of compression-induced neuronal disorders.
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Affiliation(s)
- Yi-Jen Chen
- Department of Physical Medicine and Rehabilitation, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yan-Hsiung Wang
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chau-Zen Wang
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Physiology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Mei-Ling Ho
- Orthopaedic Research Center, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Physiology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Graduate Institute of Medicine, School of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Po-Lin Kuo
- Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Mao-Hsiung Huang
- Department of Physical Medicine and Rehabilitation, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Department of Physical Medicine and Rehabilitation, Faculty of Medicine, School of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chia-Hsin Chen
- Department of Physical Medicine and Rehabilitation, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Department of Physical Medicine and Rehabilitation, Faculty of Medicine, School of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Physical Medicine and Rehabilitation, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung, Taiwan
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Monici M, Cialdai F, Ranaldi F, Paoli P, Boscaro F, Moneti G, Caselli A. Effect of IR laser on myoblasts: a proteomic study. MOLECULAR BIOSYSTEMS 2014; 9:1147-61. [PMID: 23364335 DOI: 10.1039/c2mb25398d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Laser therapy is used in physical medicine and rehabilitation to accelerate muscle recovery and in sports medicine to prevent damages produced by metabolic disturbances and inflammatory reactions after heavy exercise. The aim of this research was to get insight into possible benefits deriving from the application of an advanced IR laser system to counteract deficits of muscle energy metabolism and stimulate the recovery of hypotrophic tissue. We studied the effect of IR laser treatment on proliferation, differentiation, cytoskeleton organization and global protein expression in C2C12 myoblasts. We found that laser treatment induced a decrease in the cell proliferation rate without affecting cell viability, while leading to cytoskeletal rearrangement and expression of the early differentiation marker MyoD. The differential proteome analysis revealed the up-regulation and/or modulation of many proteins known to be involved in cell cycle regulation, cytoskeleton organization and differentiation.
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Affiliation(s)
- Monica Monici
- ASAcampus Joint Laboratory, ASA Res. Div., Dept. Clinical Physiopathology, University of Florence, Italy
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41
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Benefits of laser phototherapy on nerve repair. Lasers Med Sci 2014; 30:1395-406. [DOI: 10.1007/s10103-014-1531-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Accepted: 01/20/2014] [Indexed: 10/25/2022]
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42
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Akgul T, Gulsoy M, Gulcur HO. Effects of early and delayed laser application on nerve regeneration. Lasers Med Sci 2013; 29:351-7. [PMID: 23715785 DOI: 10.1007/s10103-013-1355-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 05/17/2013] [Indexed: 10/26/2022]
Abstract
The aim of this study is to analyze the differences between early and delayed use of low-level laser therapy (LLLT) in functional and morphological recovery of the peripheral nerve. Thirty male Wistar rats were divided into three groups after the sciatic nerve was crushed: (1) control group without laser treatment, (2) early group with laser treatment started immediately after surgery and lasted 14 days, and (3) delayed group with laser treatment starting on the postoperative day 7 and lasted until day 21. A 650-nm diode laser (model: DH650-24-3(5), Huanic, China) with an output power of 25 mW exposed transcutaneously at three equidistant points on the surgical mark corresponding to the crushed nerve. The length of the laser application was calculated as 57 s to satisfy approximately 10 J/cm(2). A Sciatic Functional Index (SFI) was used to evaluate functional improvement in groups at pre- and post-surgery (on days 7, 14, and 21). Compound action potential (CAP) was measured after the sacrifice and histological examination was performed for all groups. SFI results showed that there was no significant difference between groups at different days (p > 0.05). On the other hand, the latency of CAP decreased significantly (p < 0.05) in the delayed group. Histological examination confirmed that the number of mononuclear cells was lower (p < 0.05) in both early and delayed groups. In conclusion, results supported the hypothesis that LLLT could accelerate the rate of recovery of injured peripheral nerves in this animal model. Though both laser groups had positive outcomes, delayed group showed better recovery.
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Affiliation(s)
- Tuba Akgul
- Institute of Biomedical Engineering, Bogazici University, Kandilli Kampus, Cengelkoy, 34684, Istanbul, Turkey
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Marcolino AM, Barbosa RI, das Neves LMS, Mazzer N, de Jesus Guirro RR, de Cássia Registro Fonseca M. Assessment of functional recovery of sciatic nerve in rats submitted to low-level laser therapy with different fluences. An experimental study: laser in functional recovery in rats. J Hand Microsurg 2013; 5:49-53. [PMID: 24426674 DOI: 10.1007/s12593-013-0096-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 04/01/2013] [Indexed: 10/26/2022] Open
Abstract
Peripheral nerve lesions caused sensory and motor deficits along the distribution of the injured nerve. Numerous researches have been carried out to enhance and/or accelerate the recovery of such lesions. The objective of this study was to assess the functional recovery of sciatic nerve in rats subjected to different fluences of low-level laser therapy (LLLT). Thirty-six animals were randomly divided into four groups: one consisting of sham rats and three others irradiated with progressive fluencies of 10 J/cm(2), 40 J/cm(2) and 80 J/cm(2) of laser AsGaAl (830 nm) for 21 consecutive days. They were evaluated by the Sciatic Functional Index (SFI) method. The crush injury was performed by using a portable device with dead weight of 5,000 g whose load was applied for 10 min. A digital camera was used to record the footprints left on the acrylic track, before surgery and after, on the 7th, 14th, and 21st days. The results also showed that on the 7th day, there was a difference between the groups irradiated with 40 J/cm(2), when compared with the sham group (p < 0.05). On the 14th day the groups irradiated with 40 J/cm(2) and 80 J/cm(2) also presented better results when compared with sham, however, on the 21st day, no inter-group difference was found (p > 0.05). It was possible to observe that the LLLT at fluency of 40 J/cm(2) and 80 J/cm(2) had a positive influence on the acceleration of the functional nerve recovery.
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Affiliation(s)
- Alexandre Marcio Marcolino
- Post-Graduation Progamme Rehabilitation and Functional Performance, Department of Biomechanics, Medicine and Rehabilitation of the Locomotor Apparatus, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP Brazil ; Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor, FMRP-USP, Av; Bandeirantes, 3900, CEP 14049-900 Ribeirão Preto, SP Brazil
| | - Rafael Inácio Barbosa
- Post-Graduation Progamme Rehabilitation and Functional Performance, Department of Biomechanics, Medicine and Rehabilitation of the Locomotor Apparatus, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP Brazil
| | - Lais Mara Siqueira das Neves
- Post-Graduation Progamme Rehabilitation and Functional Performance, Department of Biomechanics, Medicine and Rehabilitation of the Locomotor Apparatus, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP Brazil
| | - Nilton Mazzer
- Department of Biomechanics, Medicine and Rehabilitation of the Locomotor Apparatus, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP Brazil
| | - Rinaldo Roberto de Jesus Guirro
- Department of Biomechanics, Medicine and Rehabilitation of the Locomotor Apparatus, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP Brazil
| | - Marisa de Cássia Registro Fonseca
- Department of Biomechanics, Medicine and Rehabilitation of the Locomotor Apparatus, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP Brazil
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Rhee CK, He P, Jung JY, Ahn JC, Chung PS, Suh MW. Effect of low-level laser therapy on cochlear hair cell recovery after gentamicin-induced ototoxicity. Lasers Med Sci 2011; 27:987-92. [PMID: 22138884 DOI: 10.1007/s10103-011-1028-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Accepted: 10/28/2011] [Indexed: 10/14/2022]
Abstract
Cochlear hair cells are the sensory receptors of the auditory system. It is well established that antibiotic drugs such as gentamicin can damage hair cells and cause hearing loss. Rescuing hair cells after ototoxic injury is an important issue in hearing recovery. Although many studies have indicated a positive effect of low-level laser therapy (LLLT) on neural cell survival, there has been no study on the effects of LLLT on cochlear hair cells. Therefore, the aim of this study was to elucidate the effects of LLLT on hair cell survival following gentamicin exposure in organotypic cultures of the cochlea of rats. The cochlea cultures were then divided into a control group (n = 8), a laser-only group (n = 8), a gentamicin-only group (n = 8) and a gentamicin plus laser group (n = 7). The control cultures were allowed to grow continuously for 11 days. The laser-only cultures were irradiated with a laser with a wavelength of 810 nm at 8 mW/cm(2) for 60 min per day (0.48 J/cm(2)) for 6 days. The gentamicin groups were exposed to 1 mM gentamicin for 48 h and allowed to recover (gentamicin-only group) or allowed to recover with daily irradiation (gentamicin plus laser group). The hair cells in all groups were stained with FM1-43 and counted every 3 days. The number of hair cells was significantly larger in the gentamicin plus laser group than in the gentamicin-only group. The number of hair cells was larger in the laser-only group than in the control group, but the difference did not reach statistical significance. These results suggest that LLLT may promote hair cell survival following gentamicin damage in the cochlea. This is the first study in the literature that has demonstrated the beneficial effect of LLLT on the recovery of cochlear hair cells.
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Affiliation(s)
- Chung-Ku Rhee
- Department of Otolaryngology-Head & Neck Surgery, Dankook University College of Medicine, Cheonan, Korea
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Moges H, Wu X, McCoy J, Vasconcelos OM, Bryant H, Grunberg NE, Anders JJ. Effect of 810 nm light on nerve regeneration after autograft repair of severely injured rat median nerve. Lasers Surg Med 2011; 43:901-6. [DOI: 10.1002/lsm.21117] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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46
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Functional and morphometric differences between the early and delayed use of phototherapy in crushed median nerves of rats. Lasers Med Sci 2011; 27:479-86. [DOI: 10.1007/s10103-011-0972-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2011] [Accepted: 07/14/2011] [Indexed: 10/17/2022]
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47
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Serafim KGG, Ramos SDP, de Lima FM, Carandina M, Ferrari O, Dias IFL, Toginho Filho DDO, Siqueira CPCM. Effects of 940 nm light-emitting diode (led) on sciatic nerve regeneration in rats. Lasers Med Sci 2011; 27:113-9. [DOI: 10.1007/s10103-011-0923-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Accepted: 04/06/2011] [Indexed: 12/21/2022]
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48
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Câmara CNDS, Brito MVH, Silveira EL, Silva DSGD, Simões VRF, Pontes RWF. Histological analysis of low-intensity laser therapy effects in peripheral nerve regeneration in Wistar rats. Acta Cir Bras 2011; 26:12-8. [DOI: 10.1590/s0102-86502011000100004] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2010] [Accepted: 10/19/2010] [Indexed: 11/21/2022] Open
Abstract
Purpose: Analyze the influence of low-intensity laser therapy in the sciatic nerve regeneration of rats submitted to controlled crush through histological analysis. Methods: Were used 20 Wistar rats, to analyze the influence of low-intensity laser therapy in the sciatic nerve regeneration, where the injury of the type axonotmesis was induced by a haemostatic clamp Crile (2nd level of the rack). The animals were randomly distributed in 2 groups. Control group (CG n = 10) and Laser group (LG n = 10). These were subdivided in 2 subgroups each, according to the euthanasia period: (CG14 _ n = 5 and CG21 _ n = 5) and (LG14 _ n = 5 and LG21 _ n = 5). At the end of treatment, the samples were removed and prepared for histological analysis, where were analyzed and quantified the following findings: Schwann cells, myelinic axons with large diameter and neurons. Results: In the groups submitted to low-intensity laser therapy, were observed an increase in the number of all analyzed aspects with significance level. Conclusion: The irradiation with low intensity laser (904nm) influenced positively the regeneration of the sciatic nerve in Wistar rats after being injured by crush (axonotmesis), becoming the nerve recovery more rapid and efficient.
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Bertolini GRF, Artifon EL, Silva TS, Cunha DM, Vigo PR. Low-level laser therapy, at 830 nm, for pain reduction in experimental model of rats with sciatica. ARQUIVOS DE NEURO-PSIQUIATRIA 2011; 69:356-9. [DOI: 10.1590/s0004-282x2011000300017] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2010] [Accepted: 11/25/2010] [Indexed: 11/22/2022]
Abstract
Chronic pain, resulting from nerve compression, is a common clinical presentation. One means of conservative treatment is low-level laser therapy, although controversial. The aim of this study was to evaluate the effects of two doses of low-level laser, at 830 nm, on pain reduction in animals subjected to sciatica. Eighteen rats were used, divided into three groups: GS (n=6), sciatica and simulated treatment; G4J (n=6), sciatica and treatment with 4 J/cm²; and G8J (n=6), sciatica and irradiation with 8 J/cm². The right sciatic nerve was exposed and compressed using catgut thread. Five days of treatment were started on the third postoperative day. Pain was assessed by means of the paw elevation time during gait: before sciatica, before and after the first and second therapies, and the end of the fifth therapy. Low-level laser was effective in reducing the painful condition.
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Affiliation(s)
| | | | - T S Silva
- Western Paraná State University, Brazil
| | - D M Cunha
- Western Paraná State University, Brazil
| | - P R Vigo
- Western Paraná State University, Brazil
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50
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Barbosa RI, Marcolino AM, Guirro RRDJ, Mazzer N, Barbieri CH, Fonseca MDCR. Efeito do laser de baixa intensidade (660 nm) na regeneração do nervo isquiático lesado em ratos. FISIOTERAPIA E PESQUISA 2010. [DOI: 10.1590/s1809-29502010000400002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Os nervos periféricos são estruturas que, ao sofrerem lesões, podem originar incapacidades motoras e sensitivas importantes. O laser de baixa intensidade é um dos diversos recursos terapêuticos para promover a regeneração nervosa precoce, mas ainda não há consenso sobre sua utilização. O objetivo deste estudo foi investigar, por meio de avaliação funcional, o efeito da terapia a laser de baixa intensidade (660 nm) na regeneração do nervo isquiático após esmagamento. Foram utilizados 18 ratos (Wistar) submetidos à lesão do nervo isquiático divididos em dois grupos, controle e grupo laser, submetido ao tratamento a laser (AsGaAl, 660 nm, 10J/cm2, 30 mW e 0,06 cm²) por 21 dias no local da lesão. Para a avaliação funcional, foi aplicado o índice funcional do ciático (IFC) no pré-operatório e nos 7º, 14º e 21º dias de pós-operatório. Quando comparados o IFC dos grupos no 14o dia de pós-operatório, foi encontrada melhora significante no grupo laser em relação ao controle. Na amostra analisada e nos parâmetros utilizados, pôde-se constatar que a aplicação do laser foi eficaz na recuperação funcional precoce do nervo ciático esmagado.
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