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Montarele LF, Pitol DL, Pereira BF, Feldman S, Fazan VPS, Issa JPM. Histological and Immunohistochemical Analysis of the Effects of Topical Melatonin Treatment Associated with Collagen Sponge and rhBMP-2 Protein on Bone Remodeling. Biomolecules 2022; 12:biom12121738. [PMID: 36551166 PMCID: PMC9775039 DOI: 10.3390/biom12121738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 08/09/2022] [Accepted: 08/18/2022] [Indexed: 11/25/2022] Open
Abstract
Extensive bone defect healing is an important health issue not yet completely resolved. Different alternative treatments have been proposed but, in face of a critical bone defect, it is still very difficult to reach a complete regeneration, with the new-formed bone presenting all morphological and physiological characteristics of a normal, preinjury bone. Topical melatonin use has shown as a promising adjuvant for bone regeneration due to its positive effects on bone metabolism. Thus, to search for new, safe, biological techniques that promote bone repair and favor defect healing, we hypothesized that there is a synergistic effect of melatonin treatment associated with rhBMP-2 to guide bone regeneration. This study aimed to investigate bone repair effects of topical melatonin administration in different concentrations (1, 10, and 100 µg), associated or not with rhBMP-2. Surgical-induced bone defect healing was qualitatively evaluated through histopathological analysis by light microscopy. Additionally, quantitative stereology was performed in immunohistochemistry-prepared tissue to identify angiogenic, osteogenic, and osteoclastogenic factors. Quantification data were compared between groups by the ANOVA/Tukey test and differences were considered significant when p < 0.05. Our results showed that the presence of the scaffold in the bone defect hindered the process of bone repair because in the group treated with "blood clot + scaffold" the results of bone formation and immunolabeling were reduced in comparison with all other groups (treated with melatonin alone or in association with rhBMP-2). Statistical analysis revealed a significant difference between the control group (bone defect + blood clot), and groups treated with different concentrations of melatonin in association with rhBMP-2, indicating a positive effect of the association for bone repair. This treatment is promising once it becomes a new safe alternative technique for the clinical treatment of fractures, bone defects, and bone grafts. Our results support the hypothesis of the safe use of the association of melatonin and rhBMP-2 and have established a safe and effective dose for this experimental treatment.
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Affiliation(s)
- Leticia Ferreira Montarele
- Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo (FORP-USP), Ribeirão Preto 14040-904, Brazil
| | - Dimitrius Leonardo Pitol
- Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo (FORP-USP), Ribeirão Preto 14040-904, Brazil
| | - Bruno Fiorelini Pereira
- Department of Biological Sciences, Universidade Federeal de São Paulo—UNIFESP, Diadema 05468-901, Brazil
| | - Sara Feldman
- LABOATEM, Laboratório de Biologia e Engenharia de Tecidos, Faculdade de Medicina, Universidade Nacional de Rosário, Rosário S2002, Argentina
| | - Valéria Paula Sassoli Fazan
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (FMRP-USP), Ribeirão Preto 14049-900, Brazil
| | - João Paulo Mardegan Issa
- Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo (FORP-USP), Ribeirão Preto 14040-904, Brazil
- Correspondence:
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Issa JPM, Santos Neto OMD, Macedo AP, Gonzaga MG, Pereira YCL, Feldman S. Evaluation of tissue in repair with natural latex and / or hyaluronic acid in surgical bone defects. Braz Dent J 2021; 32:83-95. [PMID: 34787255 DOI: 10.1590/0103-6440202104302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 04/09/2021] [Indexed: 11/22/2022] Open
Abstract
This study evaluated the bone repair in surgical defects of rats treated with hyaluronic acid (HA) associated or not with Hevea brasiliensis fraction protein (F-1). Bone defect were created in 15 albino Wistar rats divided into 3 groups (n=5): Control group (1) - blood clot; HA group (2) - 0.5% hyaluronic acid; HAF1 group (3) - 0.1% F-1 protein fraction dissolved in 0.5% hyaluronic acid. After 4 weeks, the animals were euthanized and the bone repair was evaluated through histomorphometric analysis, zymography and immunohistochemistry. The neoformed bone area did not show a significant difference (p = 0.757), but there was a tendency for bone trabeculation to increase in the groups HA and HAF1. For immunohistochemically analysis, there was a difference in vascular endothelial growth factor (VEGF) labeling (p = 0.023), being higher in the groups HA and HAF1 than the control group. No significant difference in bone sialoprotein (BSP) (p = 0.681), osteocalcin (p = 0.954), however, significant difference in platelet endothelial cell adhesion molecule-1 (CD-31) (p = 0.040), with HAF1 group being significantly lower than the control. For zymographic analysis, there was no significant difference for metalloproteinase-2 (MMP-2) (p = 0.068), but there was a tendency to increase MMP-2 in the HA group. Despite the influence on angiogenic factors and the apparent tendency for greater trabeculation in the HA and HAF1 groups, there was no significant difference in the area of newly formed bone tissue in the analyzed period.
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Affiliation(s)
- João Paulo Mardegan Issa
- São Paulo University(USP), School of Dentistry, Department of Basic and Oral Biology, Ribeirão Preto, SP, Brazil
| | - Otavio Marino Dos Santos Neto
- São Paulo University(USP), School of Dentistry, Department of Dental Materials and Prosthodontics, Ribeirão Preto, SP, Brazil
| | - Ana Paula Macedo
- São Paulo University(USP), School of Dentistry, Department of Dental Materials and Prosthodontics, Ribeirão Preto, SP, Brazil
| | - Miliane Gonçalves Gonzaga
- São Paulo University(USP), School of Dentistry, Department of Basic and Oral Biology, Ribeirão Preto, SP, Brazil
| | - Yamba Carla Lara Pereira
- São Paulo University(USP), School of Dentistry, Department of Basic and Oral Biology, Ribeirão Preto, SP, Brazil
| | - Sara Feldman
- National Rosario University, School of Medicine, LABOATEM - Osteoarticular Biology, Tissue Engineering and Emerging Therapies Laboratory, Rosario, Argentina
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Texturized P(VDF-TrFE)/BT membrane enhances bone neoformation in calvaria defects regardless of the association with photobiomodulation therapy in ovariectomized rats. Clin Oral Investig 2021; 26:1053-1065. [PMID: 34370100 DOI: 10.1007/s00784-021-04089-y] [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: 05/01/2021] [Accepted: 07/17/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVES The purpose of this investigation was to evaluate in vivo the response of bone tissue to photobiomodulation when associated with texturized P(VDF-TrFE)/BT in calvaria defects of ovariectomized rats. MATERIALS AND METHODS Wistar Hannover rats were submitted to ovariectomy/control surgery. Calvaria bone defects of 5-mm diameter were performed after 90 days of ovariectomy. The animals were divided into OVX (without laser (L) and membrane), OVX + P(VDF-TrFE)/BT, OVX + P(VDF-TrFE)/BT + L, and OVX + PTFE + L. It was utilized a low-intensity gallium-aluminum-arsenide laser (GaAlAs) with 780-nm wavelength and 30-J/cm2 energy density in 12 sessions (120 s). Thirty days after the bone defect the animals were euthanized for histological, microtomographic, and molecular evaluation. Quantitative analysis was analyzed by statistical software for p < 0.05. RESULTS Histological parameters showed bone tissue formation at the borders of all group defects. The association of photobiomodulation and texturized P(VDF-TrFE)/BT was not synergistic and did not show significant changes in morphometric analysis and biomarkers gene expression. Nevertheless, texturized P(VDF-TrFE)/BT membrane enhanced bone repair regardless of the association with photobiomodulation therapy, with an increase of connectivity density when compared to the OVX + PTFE + L group. The association of photobiomodulation therapy and PTFE was synergistic, increasing the expression of Runx2, Alp, Bsp, Bglap, Sp7, and Rankl, even though not enough to reflect significance in the morphometric parameters. CONCLUSIONS The utilization of texturized P (VDF-TrFE)/BT, regardless of the association with photobiomodulation therapy, enhanced bone repair in an experimental model of osteoporosis.
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Hanna R, Dalvi S, Amaroli A, De Angelis N, Benedicenti S. Effects of photobiomodulation on bone defects grafted with bone substitutes: A systematic review of in vivo animal studies. JOURNAL OF BIOPHOTONICS 2021; 14:e202000267. [PMID: 32857463 DOI: 10.1002/jbio.202000267] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 08/23/2020] [Accepted: 08/25/2020] [Indexed: 06/11/2023]
Abstract
A present, photobiomodulation therapy (PBMT) effectiveness in enhancing bone regeneration in bone defects grafted with or without biomaterials is unclear. This systematic review (PROSPERO, ref. CRD 42019148959) aimed to critically appraise animal in vivo published data and present the efficacy of PBMT and its potential synergistic effects on grafted bone defects. MEDLINE, CCCT, Scopus, Science Direct, Google Scholar, EMBASE, EBSCO were searched, utilizing the following keywords: bone repair; low-level laser therapy; LLLT; light emitting diode; LEDs; photobiomodulation therapy; in vivo animal studies, bone substitutes, to identify studies between 1994 and 2019. After applying the eligibility criteria, 38 papers included where the results reported according to "PRISMA." The results revealed insufficient and incomplete PBM parameters, however, the outcomes with or without biomaterials have positive effects on bone healing. In conclusion, in vivo animal studies with a standardized protocol to elucidate the effects of PBMT on biomaterials are required initially prior to clinical studies.
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Affiliation(s)
- Reem Hanna
- Department of Surgical Sciences and Integrated Diagnostics, Laser Therapy Centre, University of Genoa, Genoa, Italy
- Department of Oral Surgery, King's College Hospital NHS Foundation Trust, London, UK
| | - Snehal Dalvi
- Department of Surgical Sciences and Integrated Diagnostics, Laser Therapy Centre, University of Genoa, Genoa, Italy
- Department of Periodontology, Swargiya Dadasaheb Kalmegh Smruti Dental College and Hospital, Nagpur, India
| | - Andrea Amaroli
- Department of Orthopaedic Dentistry, First Moscow State Medical University (Sechenov University), Moscow, Russian Federation
| | - Nicola De Angelis
- Department of Surgical Sciences and Integrated Diagnostics, Laser Therapy Centre, University of Genoa, Genoa, Italy
- Faculty of Dentistry, University of Technology MARA Sungai Buloh, Shah Alam, Malaysia
| | - Stefano Benedicenti
- Department of Surgical Sciences and Integrated Diagnostics, Laser Therapy Centre, University of Genoa, Genoa, Italy
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Kheiri A, Amid R, Kheiri L, Namdari M, Mojahedi M, Kadkhodazadeh M. Effect of Low- Level Laser Therapy on Bone Regeneration of Critical-Size Bone Defects: A Systematic Review of In Vivo Studies and Meta-Analysis. Arch Oral Biol 2020; 117:104782. [PMID: 32535292 DOI: 10.1016/j.archoralbio.2020.104782] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 05/07/2020] [Accepted: 05/24/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Low-level laser therapy is a method for osteogenesis since it stimulates cell proliferation, vascularization and osteoblastic activity. Various protocols applying low-level laser with different outcomes exist. The aim of the present study was to review the result of different methods on bone formation in critical-size defects of in vivo studies. DESIGN According to PRISMA statement, electronic search of PubMed, google scholar, Scopus and Web of Science and a hand search limited to in vivo English language studies until December 2019. Studies used low-level laser therapy in bone regeneration of critical-size defects met the inclusion criteria and which used high power lasers or a defect size smaller than 5 mm, were excluded. RESULTS Finally, 18 studies were included. Fourteen studies utilized low-level laser with a wavelength ranging from 606 to 980 nm and 53 % of studies applied low-level laser in a single session. Ten studies utilized continuous wave mode of laser. Highest and lowest values of power density were 1.5 W/cm2 and 0.1 W/cm2 in order. Eleven studies evaluated low-lever laser therapy on defects of 5 mm in calvaria. Meta-analysis showed the positive effect of low-level laser therapy on osteogenesis after 30 days compared to control group and no significant difference after 60 days. CONCLUSIONS New bone formation can be increased in early stage by applying low-level laser therapy through stimulating osteoblasts and fibroblasts' proliferation. This effect would be more remarkable by combining with bone substitutes. Hence, for each case, protocol selection should be performed according defect's properties, attentively.
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Affiliation(s)
- Aida Kheiri
- Student Research Committee, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Gifted and Talented Dental Students Division, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Reza Amid
- Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Periodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Lida Kheiri
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.
| | - Mahshid Namdari
- Department of Community Oral Health, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Masoud Mojahedi
- Senior Research Fellow, University of Bonn, Germany; Department of Laser, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Mahdi Kadkhodazadeh
- Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Periodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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Almeida ALG, Freitas GP, Lopes HB, Gimenes R, Siessere S, Sousa LG, Beloti MM, Rosa AL. Effect of stem cells combined with a polymer/ceramic membrane on osteoporotic bone repair. Braz Oral Res 2019; 33:e079. [PMID: 31531565 DOI: 10.1590/1807-3107bor-2019.vol33.0079] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 06/06/2019] [Indexed: 11/22/2022] Open
Abstract
Cell therapy associated with guided bone regeneration (GBR) can be used to treat bone defects under challenging conditions such as osteoporosis. This study aimed to evaluate the effect of mesenchymal stem cells (MSCs) in combination with a poly(vinylidene-trifluoroethylene)/barium titanate (PVDF-TrFE/BT) membrane on bone repair in osteoporotic rats. Osteoporosis was induced in female rats by bilateral removal of the ovaries (OVX) or sham surgery (SHAM), and the osteoporotic condition was characterized after 5 months by microtomographic and morphometric analyses. Calvarial defects were created in osteoporotic rats that immediately received the PVDF-TrFE/BT membrane. After 2 weeks, bone marrow-derived MSCs from healthy rats, characterized by the expression of surface markers using flow cytometry, or phosphate-buffered saline (PBS) (Control) were injected into the defects and bone formation was evaluated 4 weeks post-injection by microtomographic, morphometric, and histological analyses. A reduction in the amount of bone tissue in the femurs of OVX compared with SHAM rats confirmed the osteoporotic condition of the experimental model. More bone formation was observed when the defects were injected with MSCs compared to that with PBS. The modification that we are proposing in this study for the classical GBR approach where cells are locally injected after a membrane implantation may be a promising therapeutic strategy to increase bone formation under osteoporotic condition.
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Affiliation(s)
| | - Gileade Pereira Freitas
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto , Bone Research Lab , Ribeirão Preto , SP , Brazil
| | - Helena Bacha Lopes
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto , Bone Research Lab , Ribeirão Preto , SP , Brazil
| | - Rossano Gimenes
- Universidade Federal de Itajubá - Unifei, Institute of Physics and Chemistry , Itajubá , MG , Brazil
| | - Selma Siessere
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto , Department of Basic and Oral Biology , Ribeirão Preto , SP , Brazil
| | - Luiz Gustavo Sousa
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto , Department of Basic and Oral Biology , Ribeirão Preto , SP , Brazil
| | - Marcio Mateus Beloti
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto , Bone Research Lab , Ribeirão Preto , SP , Brazil
| | - Adalberto Luiz Rosa
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto , Bone Research Lab , Ribeirão Preto , SP , Brazil
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Coletta DJ, Ibáñez-Fonseca A, Missana LR, Jammal MV, Vitelli EJ, Aimone M, Zabalza F, Issa JPM, Alonso M, Rodríguez-Cabello JC, Feldman S. Bone Regeneration Mediated by a Bioactive and Biodegradable Extracellular Matrix-Like Hydrogel Based on Elastin-Like Recombinamers. Tissue Eng Part A 2017; 23:1361-1371. [DOI: 10.1089/ten.tea.2017.0047] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Affiliation(s)
- Dante J. Coletta
- LABOATEM, Osteoarticular Biology, Tissue Engineering and Emerging Therapies Laboratory, School of Medicine, National Rosario University, Rosario, Argentina
| | | | - Liliana R. Missana
- Experimental Pathology and Tissue Engineering Laboratory, Dental School, National Tucumán University, Tucumán, Argentina
- Tissues Laboratory, Proimi-Biotechnology-Conicet, Tucumán, Argentina
| | - María V. Jammal
- Experimental Pathology and Tissue Engineering Laboratory, Dental School, National Tucumán University, Tucumán, Argentina
- Tissues Laboratory, Proimi-Biotechnology-Conicet, Tucumán, Argentina
| | - Ezequiel J. Vitelli
- LABOATEM, Osteoarticular Biology, Tissue Engineering and Emerging Therapies Laboratory, School of Medicine, National Rosario University, Rosario, Argentina
| | - Mariangeles Aimone
- LABOATEM, Osteoarticular Biology, Tissue Engineering and Emerging Therapies Laboratory, School of Medicine, National Rosario University, Rosario, Argentina
| | - Facundo Zabalza
- LABOATEM, Osteoarticular Biology, Tissue Engineering and Emerging Therapies Laboratory, School of Medicine, National Rosario University, Rosario, Argentina
| | | | - Matilde Alonso
- BIOFORGE Lab, University of Valladolid, CIBER-BBN, Valladolid, Spain
| | | | - Sara Feldman
- LABOATEM, Osteoarticular Biology, Tissue Engineering and Emerging Therapies Laboratory, School of Medicine, National Rosario University, Rosario, Argentina
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Issa JP, Gonzaga M, Kotake BG, de Lucia C, Ervolino E, Iyomasa M. Bone repair of critical size defects treated with autogenic, allogenic, or xenogenic bone grafts alone or in combination with rhBMP-2. Clin Oral Implants Res 2015; 27:558-66. [DOI: 10.1111/clr.12622] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/25/2015] [Indexed: 12/15/2022]
Affiliation(s)
- João Paulo Issa
- Department of Morphology, Physiology and Basic Pathology; University of São Paulo; São Paulo Brazil
| | - Miliane Gonzaga
- Department of Biomechanics, Medicine and Rehabilitation of the Locomotor- School of Medicine of Ribeirão Preto; University of São Paulo; São Paulo Brazil
| | - Bruna Gabriela Kotake
- Department of Biomechanics, Medicine and Rehabilitation of the Locomotor- School of Medicine of Ribeirão Preto; University of São Paulo; São Paulo Brazil
| | - Conrado de Lucia
- Department of Morphology, Physiology and Basic Pathology; University of São Paulo; São Paulo Brazil
| | - Edilson Ervolino
- Department of Basic Science at the School of Dentistry of Araçatuba; São Paulo State University; São Paulo Brazil
| | - Mamie Iyomasa
- Department of Morphology, Physiology and Basic Pathology; Faculty of Dentistry; University of São Paulo; São Paulo Brazil
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Scalize PH, de Sousa LG, Regalo SCH, Semprini M, Pitol DL, da Silva GA, de Almeida Coelho J, Coppi AA, Laad AABL, Prado KFB, Siessere S. Low-level laser therapy improves bone formation: stereology findings for osteoporosis in rat model. Lasers Med Sci 2015; 30:1599-607. [PMID: 26037661 DOI: 10.1007/s10103-015-1773-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 05/24/2015] [Indexed: 11/26/2022]
Abstract
Low-level laser therapy (LLLT) benefits bone metabolism, but its use needs to be standardized. We evaluated the effects of LLLT on bone defects in calvaria of ovariectomized rats. Stereology was used to calculate tissue repair volume (V tr ), density of trabecular bone volume (Vv t ), total volume of newly formed trabecular bone (Vtot), and the area occupied by collagen fibers (A C ). Fifty-four Wistar rats were submitted to bilateral ovariectomy, and bone defects were created in calvaria after 150 days. The animals were divided into nine groups (n = 6), and 24 h after defects, the treatment started with a 780-nm low-intensity GaAlAs laser: G1, G2, and G3 received 3 sessions of 0, 20, and 30 J/cm(2) respectively; G4, G5, and G6 received 6 sessions of 0, 20, and 30 J/cm(2), respectively; and G7, G8, and G9 received 12 sessions of 0, 20, and 30 J/cm(2), respectively. A normal distribution was found for all of the data. The test used to verify the normality was the Kolmogorov-Smirnov (KS, p > 0.05). The one-way ANOVA followed by Tukey's post hoc test was used for data processing. A difference of p < 0.05 was considered statistically significant. Groups G2 and G1 showed significance for V tr , Vv t , Vtot, and (A C ). Results were significant for (Vv t ) and (Vtot) between G3 and G1. There were no significant results between G5 and G4 as well as between G8 and G7. Groups G6 and G4 results showed statistical difference for V tr , Vv t , Vtot, and (A C ). Groups G9 and G7 showed significance for V tr , Vv t , Vtot, and (A C ). In conclusion, there was new bone formation in the groups that received 20 and 30 J/cm(2) when compared to control groups, but over time, the dose of 30 J/cm(2) showed better stereological parameters when compared to 20 J/cm(2).
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Affiliation(s)
- Priscilla Hakime Scalize
- Department of Morphology, Physiology and Basic Pathology, School of Dentistry of Ribeirão Preto, USP-University of São Paulo, Ribeirão Preto, SP, Brazil
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Aras MH, Bozdag Z, Demir T, Oksayan R, Yanık S, Sökücü O. Effects of low-level laser therapy on changes in inflammation and in the activity of osteoblasts in the expanded premaxillary suture in an ovariectomized rat model. Photomed Laser Surg 2015; 33:136-44. [PMID: 25719203 DOI: 10.1089/pho.2014.3820] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND AND OBJECTIVE Osteoporosis is a progressive systemic skeletal disease characterized by reduced bone mass/density and microarchitectural deterioration of bone tissue. Bone formation initially exceeds bone resorption, but by the third decade, such formation is reversed, resulting in a net loss of bone mass. This resorption, in turn, increases bone fragility and susceptibility to fracture. This study aimed to evaluate the effects of low-level laser therapy (LLLT) on bone regeneration in the expanded premaxillary suture in an ovariectomized rat model. METHODS Thirty-two 12-week-old female Wistar albino rats were used in the experiment. All of the animals underwent ovariectomy 3 months before the experiment. Expansion appliances were affixed to the maxillary incisors for the expansion of premaxillary sutures. The premaxillary sutures of the laser group were exposed to 5 J/cm(2) laser energy, and no treatment was performed for the controls. All the rats in both groups were euthanized on either the 7th day (n=8) [end of expansion period; Laser Group 1(LG1) and Control Group 1 (CG1)] or the 17th day (n=8) [end of retention period; Laser Group 2 (LG2) and Control Group 2 (CG2)], respectively, for histological assessment. RESULTS Histological findings indicated that the LG1 group showed a significantly higher number of osteoblasts than did the CG1 group (p=0.028). The CG1 and CG2 groups showed a significantly higher number of osteoclasts than did the LG1 and LG2 groups, respectively (p=0.005), (p=0.032). The LG2 group exhibited a capillary increase similar to that of the other groups, without statistically significant differences. CONCLUSIONS On the basis of our methodology and results, we conclude that low-level laser associated with rapid maxillary expansion influences bone regeneration in sutures, thereby accelerating healing, even in ovariectomized rats. We found that LLLT decreased osteoclastic activity in the ovariectomized rats. Therefore, preventing osteoporosis necessitates further investigations to clarify the effect of LLLT on postmenopausal patients.
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Affiliation(s)
- Mutan Hamdi Aras
- 1 Department of Oral and Maxillofacial Surgery, Gaziantep University , Gaziantep, Turkey
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Ultrastructure and light microscope analysis of intact skin after a varying number of low level laser irradiations in mice. BIOMED RESEARCH INTERNATIONAL 2014; 2014:506051. [PMID: 24616895 PMCID: PMC3925548 DOI: 10.1155/2014/506051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Revised: 11/03/2013] [Accepted: 11/12/2013] [Indexed: 11/17/2022]
Abstract
Low level laser therapy (LLLT) has been used to relieve pain, inflammation, and wound healing processes. Thus, the skin is overexposed to laser and this effect is not completely understood. This study analyzed the effects of the number of laser applications (three, six, and 10) on the intact skin of the masseteric region in mice of strain HRS/J. The animals (n = 30) were equally divided into control (0 J/cm(2)) and irradiated (20 J/cm(2)), and each of these groups was further equally divided according to the number of laser applications (three, six, and 10) and underwent LLLT on alternate days. Samples were analyzed by light microscopy and transmission electron microscope (TEM). The animals receiving applications exhibited open channels more dilated between the keratinocytes and photobiomodulation effect on endothelial cells and fibroblasts by TEM. Under the light microscope after 10 laser applications, the type I collagen decreased (P < 0.05) compared to the three and six applications. Under these experimental conditions, all numbers of applications provided photobiomodulatory effect on the epidermis and dermis, without damage. More studies are needed to standardize the energy density and number of applications recommended for laser therapy to have a better cost-benefit ratio associated with treatment.
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Effects of the combination of low-level laser irradiation and recombinant human bone morphogenetic protein-2 in bone repair. Lasers Med Sci 2011; 27:971-7. [DOI: 10.1007/s10103-011-1022-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Accepted: 10/20/2011] [Indexed: 01/10/2023]
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