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Silva T, Tobelem DDC, Malavazzi TCDS, Mendonça JFBD, Andreo L, Chavantes MC, Tempestini Horliana ACR, Turcio KHL, Gomes AO, Deana AM, Fernandes KPS, Motta LJ, Mesquita-Ferrari RA, Brugnera A, Nammour S, Bussadori SK. Effect of Photobiomodulation Combined with Physiotherapy on Functional Performance in Children with Myelomeningo-Cele-Randomized, Blind, Clinical Trial. J Clin Med 2023; 12:jcm12082920. [PMID: 37109256 PMCID: PMC10142114 DOI: 10.3390/jcm12082920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 03/16/2023] [Accepted: 03/23/2023] [Indexed: 04/29/2023] Open
Abstract
BACKGROUND This study aimed to evaluate the electrical activity of the rectus femoris, tibialis anterior, and lateral gastrocnemius muscles during the sit-to-stand task and functional mobility after a neurofunctional physiotherapy protocol associated with PBM. METHODS Twenty-five children were randomly allocated to either Active PBM + physiotherapy (n = 13) or PBM sham + physiotherapy (n = 12). PBM was carried out with a LED device (850 nm, 25 J, 50 s per point and 200 mW) at four points over the area with absence of a spiny process. Both groups completed a twelve-week supervised program with two weekly 45-60 min sessions. Pre-training and post-training assessments involved the Pediatric Evaluation of Disability Inventory (PEDI). Muscle activity was assessed using portable electromyography (BTS Engineering) and the electrodes were positioned on the lateral gastrocnemius, anterior tibialis, and rectus femoris muscles. The RMS data were recorded and analyzed. RESULTS After 24 sessions of the treatment protocol, improvements were found in the PEDI score. The participants presented greater independence in performing the tasks, requiring less assistance from their caregivers. More significant electrical activity was found in the three muscles evaluated between the rest period and execution of the sit-to-stand tasks, both in the more compromised or less compromised lower limbs. CONCLUSION Neurofunctional physiotherapy with or without PBM improved functional mobility and electrical muscle activity in children with myelomeningocele.
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Affiliation(s)
- Tamiris Silva
- University Nove de Julho (UNINOVE), São Paulo 01525-000, SP, Brazil
| | | | | | | | - Lucas Andreo
- University Nove de Julho (UNINOVE), São Paulo 01525-000, SP, Brazil
| | | | | | | | | | | | | | | | | | - Aldo Brugnera
- Physics Institute of São Carlos, University of the São Paulo, São Paulo 11330-900, SP, Brazil
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Zanin F, Shibli JA, Brugnera A. Photobiomodulation, Tissue Engineering, and Periodontal Regeneration in 21st Century: New Trends. Photobiomodul Photomed Laser Surg 2022. [DOI: 10.1089/photob.2021.0188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Affiliation(s)
- Fatima Zanin
- Collective Health Specialization, Faculty of Dentistry, Federal University of Rio de Janeiro, UFRJ, Rio de Janeiro, Brazil
| | - Jamil Awad Shibli
- Dental Research Division, Department of Periodontology, Guarulhos University, Guarulhos, Brazil
| | - Aldo Brugnera
- European Master in Oral Laser Applications (EMDOLA), University of Liege, Belgium and IFSC-University of São Paulo, USP Professor, São Paulo, Brazil
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Victor EC, Goulardins J, Cardoso VO, Silva REC, Brugnera A, Bussadori SK, Fernandes KPS, Mesquita-Ferrari RA. Effect of Photobiomodulation in Lipopolysaccharide-Treated Myoblasts. Photobiomodul Photomed Laser Surg 2020; 39:30-37. [PMID: 33332202 DOI: 10.1089/photob.2019.4782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Objective: To evaluate the effect of photobiomodulation (PBM) on cell viability, synthesis of nitric oxide (NO), and interleukin (IL)-6 inflammatory cytokine production in myoblasts cultured in the presence of lipopolysaccharides (LPSs). Methods: C2C12 myoblasts were treated with LPS and PBM using different parameters (wavelength: 780 nm; beam spot: 0.04 cm2; power output: 10 or 40 mW; energy density: 5 or 20 J/cm2; and 20-sec exposure time). Nonirradiated cells were used to the control group. Results: An increase in cell viability was found in both LPS groups in comparison with the control. PBM with the higher power output (40 mW) induced a reduction in cell viability. PBM also modulated the synthesis of NO in the myoblasts, but did not alter the expression of IL-6. Conclusions: Based on these findings, PBM is capable of modulating the cell viability and the production of NO in LPS-treated myoblasts and it is, therefore, a possible tool for the treatment of muscle injury caused by infection.
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Affiliation(s)
- Elis Cabral Victor
- Postgraduate Program in Biophotonics Applied to Health Sciences, Universidade Nove de Julho (UNINOVE), São Paulo, Brazil
| | - Juliana Goulardins
- Postgraduate Program in Biophotonics Applied to Health Sciences, Universidade Nove de Julho (UNINOVE), São Paulo, Brazil
| | - Vinicius Oliveira Cardoso
- Postgraduate Program in Biophotonics Applied to Health Sciences, Universidade Nove de Julho (UNINOVE), São Paulo, Brazil
| | | | - Aldo Brugnera
- Biomedical Engineer Research Center (CEB), Universidade Camilo Castelo Branco, São José dos Campos, Brazil
| | - Sandra Kalil Bussadori
- Postgraduate Program in Biophotonics Applied to Health Sciences, Universidade Nove de Julho (UNINOVE), São Paulo, Brazil.,Postgraduate Program in Rehabilitation Sciences, Universidade Nove de Julho (UNINOVE), São Paulo, Brazil
| | | | - Raquel Agnelli Mesquita-Ferrari
- Postgraduate Program in Biophotonics Applied to Health Sciences, Universidade Nove de Julho (UNINOVE), São Paulo, Brazil.,Postgraduate Program in Rehabilitation Sciences, Universidade Nove de Julho (UNINOVE), São Paulo, Brazil
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Zanin F, Brugnera A. " In Loco" Gingival Papilla Regeneration with Photobiomodulation: Is Blood a Natural Biomaterial? Photobiomodul Photomed Laser Surg 2020; 38:653-655. [PMID: 32758076 DOI: 10.1089/photob.2020.4848] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Fatima Zanin
- Collaborating Professor of the Collective Health Specialization, Faculty of Dentistry, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.,Department of Biophotonics, Center of Brugnera and Zanin Institute, Sao Paulo, Brazil
| | - Aldo Brugnera
- Lecturer & Member of the Education College of the European Master in Oral Laser Application (EMDOLA), University of Liege, Liege, Belgium.,Visiting Professor and research collaborator at the IFSC-University of São Paulo (USP), São Paulo, Brazil
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Brugnera AP, Nammour S, Rodrigues JA, Mayer-Santos E, de Freitas PM, Brugnera A, Zanin F. Clinical Evaluation of In-Office Dental Bleaching Using a Violet Light-Emitted Diode. Photobiomodul Photomed Laser Surg 2019; 38:98-104. [PMID: 31436475 DOI: 10.1089/photob.2018.4567] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Objective: To clinically evaluate the effect of the violet light-emitted diode (LED) light (405-410 nm) associated to in-office dental bleaching with 35% carbamide peroxide, on tooth color change and sensitivity. Participant's satisfaction after treatment was also evaluated. Materials and methods: A total of 50 participants were selected and randomized into a treatment group (n = 25): G1-two bleaching sessions of 30 min each, with 7-day interval (D0 and D7); G2-two bleaching sessions (same protocol as G1) associated with violet LED light, 30 min each session. The color evaluation was performed before and after 7 days of the second session (D0 and D14); the medium third of buccal surface of canine and central incisor teeth were evaluated under VITA Shade Guide and spectrophotometry (subjective and objective). Tooth sensitivity was evaluated immediately after the treatment and after 48 h of each bleaching session (D0, D2, D7, and D9), and a self-perception questionnaire was applied on D14. Results: Data were subjected to nonparametric Mann-Whitney test and both canine and central incisor teeth presented color change. Group G2 showed significantly more change than G1. Fisher's exact test showed no statistically significant dental sensitivity differences between groups. Both groups reported a high level of satisfaction but chi-square test showed statistically higher satisfied patients with dental bleaching in G2 than G1. Conclusions: The violet LED light (405-410 nm) could improve dental bleaching effectiveness, without sensitivity increase.
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Affiliation(s)
- Ana Paula Brugnera
- Department of Dental Sciences, Faculty of Medicine, University of Liege
- ulg, Brussels, Belgium.,Biophotonics Institute Center Brugnera and Zanin, Sao Paulo, Brazil
| | - Samir Nammour
- Department of Dental Sciences, Faculty of Medicine, University of Liege
- ulg, Brussels, Belgium
| | | | - Eric Mayer-Santos
- Department of Restorative Dentistry, School of Dentistry, University of São Paulo, Sao Paulo, Brazil
| | - Patricia M de Freitas
- Department of Restorative Dentistry, School of Dentistry, University of São Paulo, Sao Paulo, Brazil
| | - Aldo Brugnera
- Biophotonics Institute Center Brugnera and Zanin, Sao Paulo, Brazil.,National Institute of Science and Technology INCT, Basic Optics and Applied Life Sciences FSC-USP, Sao Paulo, Brazil
| | - Fatima Zanin
- Biophotonics Institute Center Brugnera and Zanin, Sao Paulo, Brazil
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Santos AECGD, Bussadori SK, Pinto MM, Pantano Junior DA, Brugnera A, Zanin FAA, Rodrigues MFSD, Motta LJ, Horliana ACRT. Evaluation of in-office tooth whitening treatment with violet LED: protocol for a randomised controlled clinical trial. BMJ Open 2018; 8:e021414. [PMID: 30181185 PMCID: PMC6129043 DOI: 10.1136/bmjopen-2017-021414] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
INTRODUCTION In-office tooth whitening treatment using violet light emited diode (LED) (405 nm) is a novel bleaching method that causes less sensitivity while offering the same effectiveness as the gold standard (35% hydrogen peroxide, H2O2). This study describes a protocol for the first randomised controlled clinical trial to compare the effects of the two methods. METHODS AND ANALYSIS Eighty patients will be divided into four groups: G1 violet LED; G2 violet LED +35% carbamide peroxide; G3 35% H2O2 and G4 violet LED +gingivoplasty. Colour will be measured at baseline, immediately after the first session and at the 15 and 180 days follow-up using the Vita Classical and the digital Easyshade V spectrophotometer (Vita, Zahnfabrik, Germany). Sensitivity after whitening will be measured using the Visual Analogue Scale at baseline and at each session in all groups and in all follow-ups. The tissue removed during gingivoplasty (G4) will be submitted to immunohistochemical analysis for the determination of inflammatory changes caused by violet LED. The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) will be evaluated before, as well as at established time point controls. The results will be expressed as mean and SD values. After determining the normality of the data, a one-way repeated-measures analysis of variance will be used for the comparison of data with normal distribution and the Kruskal-Wallis test will be used for data with non-normal distribution. A p<0.05 will be considered indicative of statistical significance. After determining the normality of the data, the Kruskal-Wallis test will be used for non-parametric data. Multivariate analysis of variance (MANOVA) and the Wilcoxon test will be used for comparing data from the PIDAQ. ETHICS AND DISSEMINATION This protocol has been approved by the Human Research Ethics Committee of UniversidadeNove de Julho (certificate: 2.034.518). The findings will be published in a peer-reviewed journal. TRIAL REGISTRATION NUMBER NCT03192852; Pre-results.
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Affiliation(s)
| | - Sandra Kalil Bussadori
- Postgraduate Program in Biophotonics Appliedto Health Sciences, Nove de Julho University, São Paulo, Brazil
- Postgraduate Program in Rehabilitation Sciences, Universidade Nove de Julho, UNINOVE, São Paulo, Brazil
| | | | | | | | | | | | - Lara Jansiski Motta
- Postgraduate Program in Biophotonics Appliedto Health Sciences, Nove de Julho University, São Paulo, Brazil
- Nove de Julho University, São Paulo, Brazil
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Botta SB, Ana PA, Gonçalves MLL, Fernandes KPS, Mesquita-Ferrari RA, de Araújo Prates R, Brugnera A, Bussadori SK. Photodynamic Therapy Associated with a Blue Dye Papain-Based Gel and Evaluation of Its Degradation of Type I Collagen Fibers. Photomed Laser Surg 2018; 36:100-104. [DOI: 10.1089/pho.2017.4342] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Sergio Brossi Botta
- Postgraduate Program, Biophotonics Applied to Health Sciences, Nove de Julho University, São Paulo, São Paulo, Brazil
| | - Patricia Aparecida Ana
- Engineering Center, Modeling and Applied Social Sciences, Federal University of ABC, Sao Bernardo do Campo, São Paulo, Brazil
| | | | | | | | - Renato de Araújo Prates
- Postgraduate Program, Biophotonics Applied to Health Sciences, Nove de Julho University, São Paulo, São Paulo, Brazil
| | - Aldo Brugnera
- National Institute of Science and Technology, INCT “Basic Optics Applied to Life Sciences,” IFSC, USP, São Carlos, São Paulo, Brazil
| | - Sandra Kalil Bussadori
- Postgraduate Program, Biophotonics Applied to Health Sciences, Nove de Julho University, São Paulo, São Paulo, Brazil
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Zeidan LC, Esteves CM, Oliveira JA, Brugnera A, Cassoni A, Rodrigues JA. Effect of different power settings of Er,Cr:YSGG laser before or after tribosilicatization on the microshear bond strength between zirconia and two types of cements. Lasers Med Sci 2017; 33:233-240. [DOI: 10.1007/s10103-017-2343-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 09/29/2017] [Indexed: 11/29/2022]
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Oliveira PH, Cassoni A, Brugnera A, Tenório IP, Rodrigues JA. Bond Strength of Abraded and Non-Abraded Bleached Enamel to Resin After Er,Cr:YSGG Laser Irradiation. Photomed Laser Surg 2017; 35:530-536. [DOI: 10.1089/pho.2016.4229] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Pedro H.C. Oliveira
- Dental Research and Graduate Studies Division, Department of Restorative Dentistry, Guarulhos University, Guarulhos, Brazil
| | - Alessandra Cassoni
- Dental Research and Graduate Studies Division, Department of Restorative Dentistry, Guarulhos University, Guarulhos, Brazil
| | - Aldo Brugnera
- Biomedicine Engineering Division, Camilo Castelo Branco University, São José dos Campos, Brazil
- The National Institute of Science and Technology–INCT “Basic Optics and Applied to Life Sciences, São Carlos-SP Brazil
| | - Ilana P. Tenório
- Dental Research and Graduate Studies Division, Department of Restorative Dentistry, Guarulhos University, Guarulhos, Brazil
| | - José A. Rodrigues
- Dental Research and Graduate Studies Division, Department of Restorative Dentistry, Guarulhos University, Guarulhos, Brazil
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de Oliveira CRAC, Zanin F, Cassoni A, Rodrigues JA, Silveira L, Pacheco MT, Brugnera A. Analysis of Human Tooth Pulp Chamber Temperature After 670 nm Laser Irradiation: In Vitro Study. Photomed Laser Surg 2017; 35:515-519. [PMID: 28437191 DOI: 10.1089/pho.2016.4233] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE One of the limiting factors of employing laser radiation on dental therapies is the potential of causing thermal injuries to pulp tissues. The purpose of this study was to evaluate intra-chamber temperature increase on extracted human teeth exposed to 670 nm wavelength InGaAlP laser diode radiation. MATERIALS AND METHODS In vitro intra-chamber temperature measurements of 12 standardized human teeth (incisors, canines, premolars, and molars; n = 3) were taken both before and after laser radiation. A type-K thermocouple fast-response thermocouple wire with a 0.5 mm diameter probe was inserted into the tooth pulp chamber (ICEL-Manaus-brand). The laser device Lasotronic-brand InGaAlP laser diode was used to irradiate tooth enamel, perpendicularly to the external surface for 30 sec, with power of levels of 340, 272, 204, 136, and 68 mW. The measurements were taken at three time points: 0, 30 sec, and 3 min after the laser irradiation. Measurements were repeated 24 h after removal and reinsertion of the probe in the pulp chamber. The temperature gradient (ΔT in °C) was calculated (ΔT = final temperature-initial temperature) for each group. Data of ΔT were statistically analyzed by two-way analysis of variance (ANOVA) at the 95% confidence level and compared by Tukey post hoc test (α = 0.05). RESULTS ANOVA showed statistically significant differences to the interaction of factors (p < 0.05). The highest ΔT values obtained were observed to incisors with 340 mW, 272 mW; 204 mW of power (respectively 4.7°C, 4.2°C, and 3.1°C); and canines presented the lowest ΔT (0.8°C-0.3°C) with no influence of power output. CONCLUSIONS Since the thermal increase was observed in this study, especially in incisors, attention should be paid to avoid pulpal damage.
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Affiliation(s)
| | - Fátima Zanin
- 2 Anhembi Morumbi University, São José dos Campos, Brazil
| | - Alessandra Cassoni
- 3 Dental Research and Graduate Studies Division, Department of Restorative Dentistry, Guarulhos University , Guarulhos, Brazil
| | - José Augusto Rodrigues
- 3 Dental Research and Graduate Studies Division, Department of Restorative Dentistry, Guarulhos University , Guarulhos, Brazil
| | | | | | - Aldo Brugnera
- 2 Anhembi Morumbi University, São José dos Campos, Brazil
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Paulos RS, Seino PY, Fukushima KA, Marques MM, de Almeida FCS, Ramalho KM, de Freitas PM, Brugnera A, Moreira MS. Effect of Nd:YAG and CO 2 Laser Irradiation on Prevention of Enamel Demineralization in Orthodontics: In Vitro Study. Photomed Laser Surg 2017; 35:282-286. [PMID: 28157423 DOI: 10.1089/pho.2016.4235] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE The aim of this study was to investigate Nd:YAG and CO2 laser effects in the prevention of demineralization in deeper layers of enamel via successive acid challenge cycles. BACKGROUND DATA Lasers are promising in the prevention of enamel demineralization around the orthodontic brackets; however, there are very few studies that evaluate if the effects of treatment could be extended after successive acid challenge cycles due to permanent enamel structural alterations. MATERIALS AND METHODS Human enamel samples were divided into five groups (n = 12): G1-application of 1.23% acidulated fluoride phosphate gel (AFP, control); G2-Nd:YAG laser irradiation (0.6 W, 84.9 J/cm2, 10 Hz, 110 μs, contact mode); G3-Nd:YAG laser irradiation associated with AFP; G4-CO2 laser irradiation (0.5 W, 28.6 J/cm2, 50 Hz, 5 μs, and 10 mm focal distance); and G5-CO2 laser irradiation associated with AFP. The samples were submitted to successive acid challenge cycles. Quantitative light-induced fluorescence and scanning electron microscopy were used to assess enamel demineralization. The data were statistically compared (α = 5%). RESULTS G1: 50.87 ± 4.57; G2: 47.72 ± 2.87; G3: 50.96 ± 4.01; G4: 28.21 ± 2.19; and G5: 30.13 ± 6.38. The CO2 laser groups had significantly lower mineral losses than those observed in all other groups after successive acid challenge cycles. CONCLUSIONS Only the CO2 laser (10.6 μm) irradiation prevents enamel demineralization around the orthodontic brackets even after exposure to successive acid challenges. The CO2 laser at 10.6 μm showed a deeper effect in enamel regarding caries prevention.
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Affiliation(s)
- Renato Siva Paulos
- 1 Master Program in Biodentistry, Ibirapuera University , São Paulo, Brazil
| | | | | | - Marcia Martins Marques
- 2 Department of Restorative Dentistry, School of Dentistry, University of São Paulo , São Paulo, Brazil
| | | | | | | | - Aldo Brugnera
- 4 Department of Biomedicine Engineering, Camilo Castelo Branco University , São Paulo, Brazil
| | - Maria Stella Moreira
- 1 Master Program in Biodentistry, Ibirapuera University , São Paulo, Brazil .,2 Department of Restorative Dentistry, School of Dentistry, University of São Paulo , São Paulo, Brazil .,5 Universidade Nove de Julho , São Paulo, Brazil
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Murayama Y, Sato Y, Hu L, Brugnera A, Compare A, Sakatani K. Relation Between Cognitive Function and Baseline Concentrations of Hemoglobin in Prefrontal Cortex of Elderly People Measured by Time-Resolved Near-Infrared Spectroscopy. Advances in Experimental Medicine and Biology 2017; 977:269-276. [DOI: 10.1007/978-3-319-55231-6_37] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Kushima SS, Nagasawa M, Shibli JA, Brugnera A, Rodrigues JA, Cassoni A. Evaluation of Temperature and Roughness Alteration of Diode Laser Irradiation of Zirconia and Titanium for Peri-Implantitis Treatment. Photomed Laser Surg 2016; 34:194-9. [PMID: 27058359 DOI: 10.1089/pho.2015.4026] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE This study investigated the effects of diode laser (gallium, aluminium, arsenide [GaAlAs]) irradiation with decontamination parameters on the temperature and roughness of yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP), titanium (TI), and sandblasted large grit acid-etched titanium (SLA). MATERIALS AND METHODS Three groups (n = 10) of standardized disks with 5 mm diameter and 2 mm thickness were produced with Y-TZP obtained from computer-aided design and computer-aided manufacturing (CAD-CAM), machined TI and SLA. The diode laser single application (808 nm, 20 sec, 1 W, 50 Hz, t on = 100 ms, t off = 100 ms, energy density = 28.29 J/cm(2)) was performed in contact mode, on each disk. The temperature was measured by a thermosensor attached to a digital thermometer fixed to the opposite irradiated surface. The temperature gradient (ΔT) was calculated (ΔT = final temperature - initial temperature) for each group. The parameters Ra (in μm) and Sa (in μm(2)) were measured by white light confocal laser microscopy to express the surface roughness. Data of ΔT was statistically analyzed by one way ANOVA at the 95% confidence level and compared by Tukey post-hoc test (α = 0.05). Roughness data was analyzed by t test. RESULTS The diode laser irradiation presented the following results (ΔT value): Y-TZP = 10.3°C(B); TI = 38.6°C(A), and SLA = 26.7°C(A). The ΔT values ((°)C) of the titanium groups were higher than for the Y-TZP group. For both roughness parameters (Ra and Sa), data did not show statistical significant differences to "irradiation" factor (p > 0.05) to Y-TZP and SLA. The Ra results (in μm) were: Y-TZP (control) = 0.73 (0.55); Y-TZP (irradiated) = 0.45 (0.27); SLA (control) = 0.74 (0.23); and SLA (irradiated) = 0.99 (0.33). The Sa results (in μm(2)) were: Y-TZP (control) = 1.39 (1.05); Y-TZP (irradiated) = 0.73 (0.41); SLA (control) = 0.85 (0.08); and SLA (irradiated) = 1.27 (0.44). CONCLUSIONS Diode laser irradiation for peri-implantitis treatment increased both zirconia and TI temperature without surface roughness alterations.
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Affiliation(s)
- Sonia Setsuko Kushima
- 1 Department of Oral Implantology, School of Dentistry, Guarulhos University Centro CEP , Guarulhos, São Paulo, Brazil
| | - Magda Nagasawa
- 1 Department of Oral Implantology, School of Dentistry, Guarulhos University Centro CEP , Guarulhos, São Paulo, Brazil
| | - Jamil Awad Shibli
- 1 Department of Oral Implantology, School of Dentistry, Guarulhos University Centro CEP , Guarulhos, São Paulo, Brazil
| | - Aldo Brugnera
- 2 Dental Clinic, Department of Biomedicine Engineering, Camilo Castelo Branco University and Instituto Brugnera e Zanin , Eugênio de Melo CEP São José dos Campos, São Paulo, Brazil
| | - José Augusto Rodrigues
- 3 Department of Restorative Dentistry, School of Dentistry, Guarulhos University Centro CEP, Guarulhos, São Paulo, Brazil
| | - Alessandra Cassoni
- 3 Department of Restorative Dentistry, School of Dentistry, Guarulhos University Centro CEP, Guarulhos, São Paulo, Brazil
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Carrara C, Brugnera A, Zanin F, Silveira L. Analysis of the intrapulpal temperature after laser therapy in vitro study with 670 nm laser. Med Oral Patol Oral Cir Bucal 2012. [DOI: 10.4317/medoral.17643512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Pires-Santos GM, Ferreira MFL, Oliveira SCPS, Monteiro JSC, Brugnera A, Pinheiro ALB. Use of Laser photobiomodulation in the evolution of oral mucositis associated with CMF chemotherapy protocol in patients with breast cancer-Case Report. Med Oral Patol Oral Cir Bucal 2012. [DOI: 10.4317/medoral.17643752] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Pinheiro AL, Lopes CB, Pacheco MT, Brugnera A, Zanin FAA, Cangussú MCT, Silveira L. Raman Spectroscopy Validation of DIAGNOdent-Assisted Fluorescence Readings on Tibial Fractures Treated with Laser Phototherapy, BMPs, Guided Bone Regeneration, and Miniplates. Photomed Laser Surg 2010; 28 Suppl 2:S89-97. [DOI: 10.1089/pho.2009.2674] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Antonio L.B. Pinheiro
- Center of Biophotonics, School of Dentistry, Federal University of Bahia, Salvador, BA, Brazil
- Universidade Camilo Castelo Branco, São José dos Campos, SP, Brazil
- Instituto Nacional de Ciência e Tecnologia de Óptica e Fotônica, São Carlos, SP, Brazil
| | | | | | - Aldo Brugnera
- Universidade Camilo Castelo Branco, São José dos Campos, SP, Brazil
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Zanin T, Zanin F, Carvalhosa AA, de Souza Castro PH, Pacheco MT, Zanin ICJ, Brugnera A. Use of 660-nm Diode Laser in the Prevention and Treatment of Human Oral Mucositis Induced by Radiotherapy and Chemotherapy. Photomed Laser Surg 2010; 28:233-7. [DOI: 10.1089/pho.2008.2242] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Taís Zanin
- Photobiology and Lasertherapy Center, Vale do Paraíba University, São Jose dos Campos, SP, Brazil
- Stomatology and Bucomaxillofacial Surgery Service, Cancer Hospital of Mato-Grosso, Cuiabá, MT, Brazil
| | - Fatima Zanin
- Biomedical Engineer Research Group, Camilo Castelo Branco University, São Jose dos Campos, SP, Brazil
| | - Artur Aburad Carvalhosa
- Stomatology and Bucomaxillofacial Surgery Service, Cancer Hospital of Mato-Grosso, Cuiabá, MT, Brazil
| | | | - Marcos Tadeu Pacheco
- Biomedical Engineer Research Group, Camilo Castelo Branco University, São Jose dos Campos, SP, Brazil
| | | | - Aldo Brugnera
- Biomedical Engineer Research Group, Camilo Castelo Branco University, São Jose dos Campos, SP, Brazil
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de Sant'Anna GR, dos Santos EAP, Soares LES, do Espírito Santo AM, Martin AA, Duarte DA, Pacheco-Soares C, Brugnera A. Dental enamel irradiated with infrared diode laser and photo-absorbing cream: part 2--EDX study. Photomed Laser Surg 2010; 27:771-82. [PMID: 19878028 DOI: 10.1089/pho.2008.2401] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE The effects of laser-induced compositional changes on the enamel were investigated by energy-dispersive X-ray fluorescence spectrometry (micro-EDX). After cariogenic challenge, we administered treatment of low-level infrared diode laser and a photo-absorbing cream (used to intensify the superficial light absorption). BACKGROUND DATA Dental caries is considered the most prevalent oral disease. A simple and noninvasive caries preventive regimen is treating tooth enamel with a laser, either alone or in combination with fluoride, which reduces enamel solubility and dissolution rates. High power lasers are still not widely used in private practice. Low-power near-infrared lasers may be an alternative approach. Energy-dispersive micro-EDX is a versatile and nondestructive spectroscopic technique that allows for a qualitative and quantitative elemental analysis of inorganic enamel components, such as calcium and phosphorus. MATERIALS AND METHODS Twenty-four extracted or exfoliated caries-free deciduous molars were divided into six groups: 1) control group (CTR-no treatment); 2) infrared laser treatment (L) (lambda = 810 nm, 100 mW/cm(2), 90 sec, 4.47 J/cm(2), 9 J); 3) infrared laser irradiation and photo-absorbing agent (CL); 4) photo-absorbing agent alone (C); 5) infrared laser irradiation and fluoridated photo-absorbing agent (FCL); and 6) fluoridated photo-absorbing agent alone (FC). Samples were analyzed using micro-EDX after two sets of treatments and pH cycling cariogenic challenges. RESULTS The CL group showed statistically significant increases in calcium and phosphorus (wt%) compared with the CTR group. The Ca/P ratio was similar in the FCL and CTR groups. There was a significant laser-induced reduction compared with the CTR group, and there was a possible modification of the organic balance content in enamel treated with laser and cream. CONCLUSION micro-EDX may be able to detect compositional changes in mineral phases of lased enamel under cariogenic challenge. Our results suggest that with a combined laser and photo-absorbing agent (CL) treatment, there was a possible disorganization of organic content in the tooth enamel with hydroxyapatite crystal reordering and reorganization.
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de Sant'anna GR, dos Santos EAP, Soares LES, do Espírito Santo AM, Martin AA, Duarte DA, Pacheco-Soares C, Brugnera A. Dental enamel irradiated with infrared diode laser and photoabsorbing cream: Part 1 -- FT-Raman Study. Photomed Laser Surg 2009; 27:499-507. [PMID: 19415988 PMCID: PMC2957074 DOI: 10.1089/pho.2008.2331] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE The aim of this FT-Raman study was to investigate laser-induced compositional changes in enamel after therapy with a low-level infrared diode laser and a photoabsorbing cream, in order to intensify the superficial light absorption before and after cariogenic challenge. BACKGROUND DATA Dental caries remains the most prevalent disease during childhood and adolescence. Preventive modalities include the use of fluoride, reduction of dietary cariogenic refined carbohydrates, plaque removal and oral hygiene techniques, and antimicrobial prescriptions. A relatively simple and noninvasive caries preventive regimen is treating tooth enamel with laser irradiation, either alone or in combination with topical fluoride treatment, resulting in reduced enamel solubility and dissolution rates. Due to their high cost, high-powered lasers are still not widely employed in private practice in developing countries. Thus, low-power red and near-infrared lasers appear to be an appealing alternative. MATERIALS AND METHODS Twenty-four extracted or exfoliated caries-free deciduous molars were divided into six groups: control group (no treatment; n = 8); infrared laser treatment (L; n = 8) (810 nm at 100 mW/cm(2) for 90 sec); infrared diode laser irradiation (810 nm at 100 mW/cm(2) for 90 sec) and photoabsorbing cream (IVL; n = 8); photoabsorbing cream alone (IV; n = 8); infrared diode laser irradiation (810 nm at 100 mW/cm(2) for 90 sec) and fluorinated photoabsorbing agent (IVLF; n = 8); and fluorinated photoabsorbing agent alone (IVF; n = 8). Samples were analyzed using FT-Raman spectroscopy before and after pH cycling cariogenic challenge. RESULTS There was a significant laser-induced reduction and possible modification of the organic matrix content in enamel treated with the low-level diode laser (the L, IVL, and IVFL groups). CONCLUSION The FT-Raman technique may be suitable for detecting compositional and structural changes occurring in mineral phases and organic phases of lased enamel under cariogenic challenge.
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Affiliation(s)
- Giselle Rodrigues de Sant'anna
- Vale do Paraíba University, UNIVAP, Research and Development Institute, IP&D, Laboratory of Biomedical Vibrational Spectroscopy, LEVB and Dental Laser Center, São José dos Campos, São Paulo, Brazil.
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20
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Sasaki LH, Lobo PDC, Moriyama Y, Watanabe IS, Villaverde AB, Tanaka CSI, Moriyama EH, Brugnera A. Tensile bond strength and SEM analysis of enamel etched with Er:YAG laser and phosphoric acid: a comparative study in vitro. Braz Dent J 2009; 19:57-61. [PMID: 18438561 DOI: 10.1590/s0103-64402008000100010] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2008] [Accepted: 02/29/2008] [Indexed: 11/22/2022] Open
Abstract
Er:YAG laser has been studied as a potential tool for restorative dentistry due to its ability to selectively remove oral hard tissue with minimal or no thermal damage to the surrounding tissues. The purpose of this study was to evaluate in vitro the tensile bond strength (TBS) of an adhesive/composite resin system to human enamel surfaces treated with 37% phosphoric acid, Er:YAG laser (lambda=2.94 microm) with a total energy of 16 J (80 mJ/pulse, 2Hz, 200 pulses, 250 ms pulse width), and Er:YAG laser followed by phosphoric acid etching. Analysis of the treated surfaces was performed by scanning electron microscopy (SEM) to assess morphological differences among the groups. TBS means (in MPa) were as follows: Er:YAG laser + acid (11.7 MPa) > acid (8.2 MPa) > Er:YAG laser (6.1 MPa), with the group treated with laser+acid being significantly from the other groups (p=0.0006 and p= 0.00019, respectively). The groups treated with acid alone and laser alone were significantly different from each other (p=0.0003). The SEM analysis revealed morphological changes that corroborate the TBS results, suggesting that the differences in TBS means among the groups are related to the different etching patterns produced by each type of surface treatment. The findings of this study indicate that the association between Er:YAG laser and phosphoric acid can be used as a valuable resource to increase bond strength to laser-prepared enamel.
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Affiliation(s)
- Luis H Sasaki
- Departament of Prosthodontics, Bandeirante University of São Paulo, São Paulo, SP, Brazil
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Soares LES, do Espírito Santo AM, Brugnera A, Zanin FANA, Martin AA. Effects of Er:YAG laser irradiation and manipulation treatments on dentin components, part 2: energy-dispersive X-ray fluorescence spectrometry study. J Biomed Opt 2009; 14:024002. [PMID: 19405732 DOI: 10.1117/1.3103287] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The effects of laser etching, decontamination, and storage treatments on dentin components were studied by energy-dispersive X-ray fluorescence spectrometry (EDXRF). Thirty bovine incisors were prepared to expose the dentin surface and then divided into two main groups based upon the decontamination process and storage procedure: autoclaved (group A, n=15) or stored in aqueous thymol solution (group B, n=15). The surfaces of the dentin slices were schematically divided into four areas, with each one corresponding to a treatment subgroup. The specimens were either etched with phosphoric acid (control subgroup) or irradiated with erbium-doped yttrium-aluminum-garnet (Er:YAG) laser (subgroups: I-80 mJ, II-120 mJ, and III-180 mJ). Samples were analyzed by micro-EDXRF, yielding three spectra for each area (before and after treatment). Surface mappings covering an area of 80x60 points with steps of 20 mum were also performed on selected specimens. The amount of Ca and P in group A specimens decreased significantly (P<0.05) after the acid etching and the CaP ratio increased (P<0.001). Er:YAG laser-etching using lower laser energies did not produce significant changes in dentin components. The mapping data support the hypothesis that acid etching on dentin produced a more chemically homogeneous surface and thus a more favorable surface for the diffusion of adhesive monomers.
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Affiliation(s)
- Luís Eduardo Silva Soares
- Vale do Paraiba University, UNIVAP, Dental Materials and Operative Dentistry Department, School of Dentistry Research and Development Institute, 12244-000 Sao Jose dos Campos, Sao Paulo, Brazil.
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Rocha R, Villaverde AB, Silveira L, Brugnera A, Alves LP, Munin E, Rodrigues KC, Pasqualucci CA, Pacheco MTT. Fluorescence and Reflectance Spectroscopy for Identification of Atherosclerosis in Human Carotid Arteries Using Principal Components Analysis. Photomed Laser Surg 2008; 26:329-35. [DOI: 10.1089/pho.2007.2208] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- Rick Rocha
- Instituto de Pesquisa & Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, SP, Brazil
| | - Antonio Balbin Villaverde
- Instituto de Pesquisa & Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, SP, Brazil
| | - Landulfo Silveira
- Instituto de Pesquisa & Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, SP, Brazil
| | - Aldo Brugnera
- Instituto de Pesquisa & Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, SP, Brazil
| | - Leandro Procópio Alves
- Instituto de Pesquisa & Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, SP, Brazil
| | - Egberto Munin
- Instituto de Pesquisa & Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, SP, Brazil
| | - Kátia Calligaris Rodrigues
- Instituto de Pesquisa & Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, SP, Brazil
| | | | - Marcos Tadeu Tavares Pacheco
- Instituto de Pesquisa & Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, SP, Brazil
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Albertini R, Villaverde AB, Aimbire F, Bjordal J, Brugnera A, Mittmann J, Silva JA, Costa M. Cytokine mRNA expression is decreased in the subplantar muscle of rat paw subjected to carrageenan-induced inflammation after low-level laser therapy. Photomed Laser Surg 2008; 26:19-24. [PMID: 18248157 DOI: 10.1089/pho.2007.2119] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE The objective of this work was to investigate the anti-inflammatory effects of low-level laser therapy, applied at different wavelengths (660 and 684 nm), on cytokine mRNA expression after carrageenan-induced acute inflammation in rat paw. BACKGROUND DATA Low-level laser therapy (LLLT) has been observed to reduce pain in inflammatory disorders. However, little is known about the mechanisms behind this effect or whether it is wavelength-specific. MATERIALS AND METHODS The test sample consisted of 32 rats divided into four groups: A(1) (control-saline), A(2) (carrageenan-only), A(3) (carrageenan + 660 nm laser therapy), and A(4) (carrageenan + 684 nm laser therapy). The animals from groups A(3) and A(4) were irradiated 1 h after induction of inflammation by carrageenan injection. Continuous-wave red lasers with wavelengths of 660 and 684 nm and dose of 7.5 J/cm(2) were used. RESULTS Both the 660 nm and 684 nm laser groups had 30%-40% lower mRNA expression for cytokines TNF-alpha, IL-1beta, and IL-6 in the paw muscle tissue than the carrageenan-only control group. Cytokine measurements were made 3 h after laser irradiation of the paw muscle, and all cytokine differences between the carrageenan-only control group and the LLLT groups were statistically significant (p < 0.001). CONCLUSIONS LLLT at the 660-nm and 684-nm wavelengths administered to inflamed rat paw tissue at a dose of 7.5 J/cm(2) reduce cytokine mRNA expression levels within 3 h in the laser-irradiated tissue.
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Affiliation(s)
- Regiane Albertini
- Instituto de Pesquisa and Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, SP, Brazil
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Rocha R, Silveira L, Villaverde AB, Pasqualucci CA, Costa MS, Brugnera A, Pacheco MTT. Use of near-infrared Raman spectroscopy for identification of atherosclerotic plaques in the carotid artery. Photomed Laser Surg 2008; 25:482-6. [PMID: 18158749 DOI: 10.1089/pho.2007.2111] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES The aim of this work was to identify the presence of atherosclerotic plaque in the human carotid artery using near infrared Raman spectroscopy. BACKGROUND DATA Atherosclerosis is the most common and serious pathology of the cardiovascular system. Raman spectroscopy is an analytical tool that can be used to gather information about both the morphology and chemical composition of tissues. METHODS A Ti:sapphire laser operating at the near-infrared wavelength of 830 nm pumped by an argon laser was used for excitation of the samples, and the Raman scattering was detected by an optical spectrometer with a liquid-nitrogen-cooled CCD detector. Carotid artery samples were classified into five groups: normal, intimal thickening, fatty plaque, fibrous-fatty plaque, and fibrous-calcified plaque. RESULTS It was observed that the Raman spectrum of atheromatous plaque was different that that of normal tissue. The spectra of atheromatous plaques had bands due to the presence of cholesterol and its esters, with major bands at 1439 and 1663 cm(1), respectively. In normal tissues a peak related to C-H bending appears at 1451 cm(1). Calcified atheromatous plaques had primary bands at 961 and 1071 cm(1), which were due to the presence of phosphate and carbonate in the accumulated calcium. Peaks were seen at 1451 and 1655 cm(1) in the non-atherosclerotic tissue, which were shifted to 1439 and 1663 cm(1) in the atherosclerotic plaque. CONCLUSIONS Our results indicate that this technique could be used to detect the presence of atherosclerotic plaques in carotid arterial tissue.
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Affiliation(s)
- Rick Rocha
- Institute of Research and Development, Universidade do Vale do Paraíba, São José dos Campos, Universidade de São Paulo, São Paulo, SP, Brazil
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Rocha R, Villaverde AB, Pasqualucci CA, Silveira L, Brugnera A, Costa MS, Pacheco MTT. Identification of calcifications in cardiac valves by near infrared Raman spectroscopy. Photomed Laser Surg 2007; 25:287-90. [PMID: 17803386 DOI: 10.1089/pho.2007.2100] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE The objective of this work was to detect calcification in cardiac valves using near infrared Raman spectroscopy (NIRS). A Ti:sapphire laser pumped by an argon-ion laser operating at a wavelength of 830 nm was used for excitation of the valve samples, and Raman emission was detected by an optical spectrometer with a liquid nitrogen-cooled CCD detector. BACKGROUND Cardiac valves are subjected to highly repetitive mechanical stresses, due to their over 40 million cardiac cycles per year. These structures may suffer cumulative lesions, complicated by the deposition of calcium phosphate, which can lead to clinically significant diseases. NIRS can provide important information about biological tissue composition and has been used for diagnosis of some types of human pathology. METHODS Samples of normal and pathologic tissues 5 mm in size were analyzed. RESULTS It was observed that the Raman spectrum of calcified cardiac valves presented different behavior when compared with normal valves. Differences were observed at the intensity of 960, 1,260, 1,452, and 1,660 cm(1) peaks. CONCLUSIONS These results suggest that this technique could be used to detect calcium phosphate mineral deposition in cardiac valves.
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Affiliation(s)
- Rick Rocha
- Instituto de Pesquisa & Desenvolvimento (IP&D), Universidade do Vale do Paraíba - UNIVAP, Urbanova, São José dos Campos, SP, Brazil
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Soares LES, Resende EBPS, Brugnera A, Zanin FAA, Martin AA. Combined FT-Raman and SEM Studies of the Effects of Er:YAG Laser Irradiation on Dentin. Photomed Laser Surg 2007; 25:239-44. [PMID: 17803378 DOI: 10.1089/pho.2007.2054] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE This study evaluated the molecular and morphological changes on dentin elements after Er:YAG laser irradiation. BACKGROUND DATA Spectroscopy studies reporting the effects of Er:YAG laser irradiation as an alternative to acid etching are needed to better understand the laser's effects. METHODS The occlusal one-third of the crown of six human third molars was removed. The dentin surface was schematically divided into areas corresponding to four surface treatment groups: control (group C): 37% phosphoric acid etching; group I: Er:YAG laser 80 mJ; group II: Er:YAG laser 120 mJ; and group III: Er:YAG laser 180 mJ. The analysis was performed by scanning electron microscopy (SEM) and Fourier transform Raman spectroscopy (FT-Raman) before and after the treatments. Raman data were submitted to ANOVA and Bonferroni tests. RESULTS The SEM photomicrographs revealed open dentin tubules in the control group. The molars from groups I, II, and III showed partially open dentin tubules. SEM images showed that the laser-irradiated dentin surface was not favorable to the diffusion of monomers. A significant reduction of the spectra relative intensity was observed in group III specimens. CONCLUSIONS Er:YAG laser irradiation with 180 mJ could produce chemical changes in proteins, phosphate, and carbonate in dentin.
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Affiliation(s)
- Luís Eduardo Silva Soares
- Biomedical Vibrational Spectroscopy Laboratory, Research and Development Institute (IP&D), Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, Brazil
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Serra G, Brugnera A, Elias CN, Bolognese AM. Effect of argon laser curing on the shear bond strength of metal brackets bonded with light-cured glass ionomer cement. Am J Orthod Dentofacial Orthop 2005; 128:740-3; quiz 802. [PMID: 16360914 DOI: 10.1016/j.ajodo.2004.08.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2004] [Revised: 08/01/2004] [Accepted: 08/01/2004] [Indexed: 10/25/2022]
Abstract
INTRODUCTION The purpose of this study was to evaluate the shear bond strength and debonding characteristics of glass ionomer cement cured with an argon laser. METHODS Thirty extracted first premolars were divided into 2 groups of 15. The teeth were cleaned and mounted in resin, and metal brackets were bonded with glass ionomer cement. In the control group, the bond was cured with a halogen light for 40 seconds (20 seconds mesial and 20 seconds distal). In the test group, the specimens were cured with an argon laser for 5 seconds. Brackets were debonded in shear; bond strength was measured, and the adhesive remnant index was scored. RESULTS The difference in mean shear bond strength was not statistically significant between groups when compared with a t test. More adhesive remained on the enamel surface in the laser group than in the control group. CONCLUSIONS Argon laser curing produces bond strengths equivalent to those obtained with traditional light curing in much less time, but it leaves more adhesive on the tooth surface.
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Affiliation(s)
- Glaucio Serra
- Biomedical laser center, IPD-UNIVAP, São Jose dos Campos, São Paulo, Brazil.
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Harashima T, Kinoshita JI, Kimura Y, Brugnera A, Zanin F, Pecora JD, Matsumoto K. Morphological comparative study on ablation of dental hard tissues at cavity preparation by Er:YAG and Er,Cr:YSGG lasers. Photomed Laser Surg 2005; 23:52-5. [PMID: 15782033 DOI: 10.1089/pho.2005.23.52] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE The purpose of this study was to evaluate morphologically the dental hard tissue ablation at the class V cavity preparation by two types of laser devices: Er:YAG and Er,Cr:YSGG lasers in vitro. BACKGROUND DATA There have been no reports on the comparative study of dental tissue ablation at cavity preparation by Er:YAG and Er,Cr:YSGG lasers. METHODS Twenty-two extracted human mature molar teeth were used in this study and divided into two groups of 11 teeth each. The teeth of the Er:YAG laser-irradiated group were irradiated at the parameters of 250 mJ/pulse and 15 Hz with water spray, and those of the Er,Cr:YSGG laserirradiated group were irradiated at the parameters of 5 Wand 20 Hz with water spray. After cavity preparation, the teeth were dehydrated, coated with platinum, and examined by scanning electron microscopy. RESULTS Both of the laser devices were capable of ablating dental hard tissues, but similar, irregular, and rugged surface aspects with different depths were observed. Open dentinal tubules at the cavities prepared by Er,Cr:YSGG laser were more clearly visible than those prepared by Er:YAG laser. Smaller width and stripped surfaces were observed on the cavities prepared by Er,Cr:YSGG laser. CONCLUSION The results suggested that there is little difference between the two types of lasers-Er:YAG and Er,Cr:YSGG lasers-morphologically for class V cavity preparation, because both lasers were capable of preparing class V cavities, and the morphological features of the irradiated surfaces were very similar.
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Affiliation(s)
- Tomomi Harashima
- Department of Cariology & Endodontology, Showa University School of Dentistry, 2-1-1 Kitasenzoku, Ohta-ku, Tokyo 145-8515, Japan
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Brugnera A, Zanin F, Barbin EL, Spanó JC, Santana R, Pécora JD. Effects of Er:YAG and Nd:YAG laser irradiation on radicular dentine permeability using different irrigating solutions. Lasers Surg Med 2004; 33:256-9. [PMID: 14571450 DOI: 10.1002/lsm.10214] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND AND OBJECTIVES To evaluate the effect of Er:YAG and Nd:YAG laser on radicular dentine permeability when using distilled and deionized water and 1% NaClO as irrigating solutions. STUDY DESIGN/MATERIALS AND METHODS Thirty human maxillary canines were divided randomly into six groups. The root canals were instrumented with K files and the step-back technique. Group I, irrigation with distilled and deionized water; Group II, irrigation with 1% NaClO; Group III, irrigation with distilled and deionized water and Er:YAG laser application (140 mJ input, 61 mJ output 15 Hz, 300 pulses, and 42 J); Group IV, irrigation with 1% NaClO and Er:YAG laser application (same parameters as Group III); Group V, irrigation with distilled and deionized water and Nd:YAG laser application (150 mJ, 15 Hz, 2,25 W); Group VI, irrigation with 1% NaClO and Nd:YAG laser application (same parameters as Group V). During laser application the teeth were always filled with the irrigating solution. The tip was withdrawn gently in helicoidal movement from the apex to the cervical portion. The teeth were processed for histochemical evaluation. RESULTS The Tukey test showed that the cervical and middle thirds were statistically similar (P > 0.05) and significantly greater than the apical third (P < 0.05). The Scheffé test showed significantly greater dentine permeability in root canals in which water and Er:YAG laser were used and were significantly different from the other treatments (P < 0.05). CONCLUSIONS The use of distilled and deionized water and Er:YAG laser showed the greater increase of dentine permeability. The use of 1% NaClO with Nd:YAG laser, distilled, and deionized water with Nd:YAG laser and the use of water increased dentine permeability less than the other groups. The use of 1% NaClO with and without Er:YAG laser application were positioned intermediately among the treatments.
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Affiliation(s)
- Aldo Brugnera
- Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
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Abstract
Low level laser therapy (LLLT) has been used successfully in biomedicine and some of the results are thought to be related to cell proliferation. The effects of LLLT on cell proliferation is debatable because studies have found both an increase and a decrease in proliferation of cell cultures. Cell culture is an excellent method to assess both effects and dose of treatment. The aim of this study was to assess the effect of 635nm and 670 nm laser irradiation of H.Ep.2 cells in vitro using MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide). The cells were obtained from squamous cell carcinoma (SCC) of the larynx and were routinely processed from defrost to the experimental condition. Twenty-four hours after transplantation the cells were irradiated with doses ranging from 0.04 to 0.48J/cm2 for seven consecutive days (5 mW diode lasers: 635nm or 670 nm, beam cross-section approximately 1 mm) at local light doses between 0.04 and 0.48 J/cm2. The results showed that 635nm laser light did not significantly stimulate the proliferation of H.Ep.2 cells at doses of 0.04 J/cm2 to 0.48 J/cm2, However, 670nm laser irradiation led to an increased cell proliferation when compared to both control and 635nm irradiated cells. The best cell proliferation was found with 670nm laser irradiated cultures exposed to doses of doses of 0.04 to 0.48 J/cm2. We conclude that both dose and wavelength are factors that may affect cell proliferation of H.Ep.2 cells.
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Pinheiro ALB, Cavalcanti Das Neves J, Lisboa De Castro JF, Lima Verde Santos JZ, Da Fonseca Ribeiro De Sena KX, Brugnera A, Zanin FA, Matos De Oliveira MA. Comparison of the effects of the CO2 laser and chlorohexidine on the decontamination of infected cutaneous wounds: a histologic study in rats. J Clin Laser Med Surg 2002; 20:123-7. [PMID: 12165124 DOI: 10.1089/104454702760090191] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The aim of this study was to compare histologically the effects of CO2 laser and chlorohexidine gluconate (4%) on Staphylococcus aureus-infected cutaneous wounds. BACKGROUND DATA Wound infection constitutes a big risk for patients, and it is usually associated with increased morbidity, mortality and hospital costs. It is accepted that local treatment of these infections is effective. MATERIALS AND METHODS Standardized wounds created on the dorsum of 36 rats were infected with Staphylococcus aureus and treated during 6 days as follows: group I, chlorohexidine gluconate (4%) applied to the wound surface during 1 min during 6 days; group II, single CO2 laser irradiation (8 W, CW, unfocused, 8-cm focal distance, 81,530 W/cm(2)), maintaining surface debris; group III, single CO2 laser irradiation (8 W, CW, unfocused, 8-cm focal distance, 81,530 W/cm(2)), removing the surface debris. Seven days after wounding, the animals were killed and specimens taken for light microscopy. RESULTS On control wounds, epithelial ulceration and neutrophylic and lymphoplasmocitary inflammatory infiltrate was observed. On group II, there was epithelial hyperplasia, areas of ulceration and intense neutrophylic and lymphoplasmocitary inflammatory infiltrate. In group III, there was a neutrophylic inflammatory infiltrate underneath the surface debris and below that intense lymphoplasmocitary inflammatory infiltrate. When the surface debris was removed (group IV), there was epithelial ulceration and mild lymphoplasmocitary inflammatory infiltrate and fibroblasts and collagen fibers. CONCLUSION The results of this study show that infected wounds treated with 4% chlorohexidine show a more pronounced inflammatory reaction when compared to that observed when the CO2 laser is used, especially when surface debris are removed; surface debris removal on laser-treated wounds results in better and more rapid healing; the surface debris may act as a culture medium for bacterial growth or, because of its characteristics, it may act as a local irritant and delay healing.
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Pinheiro ALB, Carneiro NS, Vieira ALDB, Brugnera A, Zanin FA, Barros RA, Silva PSD. Effects of low-level laser therapy on malignant cells: in vitro study. J Clin Laser Med Surg 2002; 20:23-6. [PMID: 11902350 DOI: 10.1089/104454702753474977] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The aim of this study was to assess the effect of 635- and 670-nm laser irradiation on H.Ep.2 cells in vitro using MTT. In addition to our previous report on the effects of LLLT on the proliferation of laryngeal carcinoma cells in which it was found that irradiaton H.Ep.2 cells with 670-nm laser results in increased cell proliferation, it was decided to evaluate the effect of increased doses of laser light on these cells. The cells, obtained from SCC of the larynx, were routinely processed from defrost to the experimental condition. The cultures were kept either at 5% or 10% of FBS. Twenty-four hours after transplantation, the cells were irradiated with laser light (5-mW diode lasers; 635 and 670-nm; beam cross section approximately 1 mm) at local light doses between 0.04 and 4.8.10(4) Jm(-2). For 670 nm, significant differences in the proliferation were observed between the two concentrations of FBS (p = 0.002) and between irradiated cultures and controls (p = 0.000). Although the results were not significant, 635-nm irradiated cells also proliferated more than nonirradiated ones. This occurred under both conditions of nutrition. It is concluded, that irradiation with 670-nm laser light applied at doses between 0.04 and 4.810(4) Jm(-2) could significantly increase proliferation of laryngeal cancer cells.
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Corona SA, Borsatto M, Dibb RG, Ramos RP, Brugnera A, Pécora JD. Microleakage of class V resin composite restorations after bur, air-abrasion or Er:YAG laser preparation. Oper Dent 2001; 26:491-7. [PMID: 11551014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
This in vitro study compared the microleakage of Class V resin composite restorations placed in cavities prepared with a high-speed dental bur, air-abrasion or Er:YAG laser. Twenty sound extracted human third molars were selected and randomly assigned to four equal Groups (n=10): Group I, cavities were cut by dental drill at high-speed; Group II, aluminum oxide air-abrasion was used for cavity preparation, and in Groups III and IV, cavities were prepared by Er:YAG laser. Following cavity preparation, Groups I and II were acid-etched, Group III was treated only by Er:YAG laser and Group IV was conditioned by Er:YAG laser followed by acid-etching. Cavities were restored (Single Bond + Z-100) and the teeth stored for seven days in distilled water. Then, the restorations were polished and the specimens thermocycled, immersed in a 0.2% Rhodamine solution, sectioned and analyzed for leakage at the occlusal (enamel) and cervical (dentin/cementum) interfaces using an optical microscope connected to a video camera. The images were digitized and software was utilized for microleakage assessment. Upon analyzing the results, statistically significant differences (p<0.01) between the occlusal and cervical regions for all groups was observed, and, as a rule, there was better marginal sealing at the enamel margins. The highest degree of infiltration was observed for cavities prepared and treated exclusively by Er:YAG (Group III). The other experimental groups showed statistical similarities in the amount of marginal leakage at the enamel margins. However, at the cervical margins, there was a significant difference (p<0.05) between Group I and the remaining groups. None of the techniques completely eliminated marginal microleakage at the dentin/ cementum margins.
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Affiliation(s)
- S A Corona
- Universidade de São Paulo, Faculdade de Odontologia de Ribeirão Preto, Departamento de Odontologia Restauradora, Brazil
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Watanabe I, Lopes RA, Brugnera A, Katayama AY, Gardini AE. Effect of CO2 laser on Class V cavities of human molar teeth under a scanning electron microscope. Braz Dent J 1996; 7:27-31. [PMID: 9206351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The purpose of this study was to evaluate the effects of CO2 laser on dentin of class V cavities of extracted human molar teeth using a scanning electron microscope. SEM showed a smooth area with concentric lines formed by melting with subsequent recrystallization of dentin, areas of granulation, vitrified surface, numerous cracks, and irregular areas of descamative dentin. These data indicate that CO2 laser (4 and 6 watts) produces dentin alterations and limit its clinical applications.
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Affiliation(s)
- I Watanabe
- Departamento de Anatomia, ICB-USP, São Paulo, SP, Brasil
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