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Aguiar RCDO, Nunes LP, Batista ES, Viana MM, Rodrigues MC, Bueno-Silva B, Roscoe MG. Experimental composite containing silicon dioxide-coated silver nanoparticles for orthodontic bonding: Antimicrobial activity and shear bond strength. Dental Press J Orthod 2022; 27:e222116. [PMID: 35792792 PMCID: PMC9255988 DOI: 10.1590/2177-6709.27.3.e222116.oar] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 05/08/2021] [Indexed: 11/22/2022] Open
Abstract
Objective: This study aimed to investigate the antimicrobial activity and shear bond strength (SBS) of orthodontic brackets to bovine enamel using experimental composites with different concentrations of silicon dioxide-coated silver nanoparticles (Ag@SiO2 NPs). Methods: Fifty bovine incisors were divided into five groups according to the composite (n = 10): G1 - Control Group (Transbond XT Resin), G2 - Experimental composite without Ag@SiO2 NPs; G3 - Experimental composite with 0.5% of Ag@SiO2 NPs; G4 - Experimental composite with 1% of Ag@SiO2 NPs; G5 - Experimental composite with 3% of Ag@SiO2 NPs. The SBS test was performed using a universal mechanical testing machine, and the adhesive remnant index (ARI) was analyzed by optical microscopy. For the antimicrobial activity evaluation, Streptococcus mutans (S. mutans) biofilm was formed for three days in hydroxyapatite discs. Posteriorly, S. mutans colony forming units (CFU) were evaluated. For SBS analysis, Analysis of Variance was used, followed by the Tukey test, at a 5% statistical significance level. The CFU data were analyzed by Kruskal-Wallis, followed by Dunn as a post-hoc test. The ARI results were analyzed descriptively. Results: There was no statistically significant difference in SBS values between the experimental and control groups (p>0.05). A 3% incorporation of Ag@SiO2 NPs statistically reduced the SBS values (p<0.05) compared to the 1% group. The addition of 3% of Ag@SiO2 NPs to the composites significantly reduced S. mutans biofilm formation, compared to group G2 (p<0.05). Conclusion: Composites incorporating 3% of Ag@SiO2 NPs presented similar SBS values compared to the control group, and showed significant antimicrobial activity.
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Affiliation(s)
| | - Larissa Pereira Nunes
- Universidade Estadual de São Paulo (UNESP), Departamento de Medicina Dentária Preventiva e Restaurativa, Faculdade de Odontologia (Araçatuba/SP, Brazil)
| | | | - Marina Mariante Viana
- Universidade Cruzeiro do Sul (UNICSUL), Departamento de Pós-graduação, Faculdade de Odontologia (São Paulo/SP, Brazil)
| | - Marcela Charantola Rodrigues
- Universidade Municipal de São Caetano do Sul, Programa de Pós-Graduação em Ensino em Saúde (São Caetano do Sul/SP, Brazil)
| | - Bruno Bueno-Silva
- Universidade de Guarulhos (UNG), Faculdade de Odontologia (Guarulhos/SP, Brazil)
| | - Marina Guimarães Roscoe
- Universidade de São Paulo (FOUSP), Departamento de Biomateriais e Biologia Oral, Faculdade de Odontologia (São Paulo/SP, Brazil)
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Rodrigues MC, Rolim WR, Viana MM, Souza TR, Gonçalves F, Tanaka CJ, Bueno-Silva B, Seabra AB. Biogenic synthesis and antimicrobial activity of silica-coated silver nanoparticles for esthetic dental applications. J Dent 2020; 96:103327. [PMID: 32229160 DOI: 10.1016/j.jdent.2020.103327] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [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: 09/19/2019] [Revised: 03/19/2020] [Accepted: 03/21/2020] [Indexed: 10/24/2022] Open
Abstract
OBJECTIVES this study aimed to synthesize AgNPs from green tea (GT) extract, forming GT-AgNPs, and to coat their surfaces with silica, resulting in light-colored Ag@SiO2 nanoparticles. MATERIALS AND METHODS particles were characterized and tested for minimal inhibitory concentration (MIC), biofilm formation against Streptococcus mutans and cytotoxicity evaluation on dental pulp fibroblasts. RESULTS X-ray diffraction (XRD) confirmed the formation of pure AgNPs, whereas energy dispersive X-ray spectroscopy (EDS) mapped their elemental atoms. Dynamic light scattering (DLS) demonstrated formation of particles at nanoscale, with moderate polydispersity and negative zeta potential, in agreement with nanoparticle tracking analysis (NTA) size measurements. Fourier-transformed infrared (FTIR) spectroscopy confirmed the successful condensation of silica, which significantly increased surface area by 50%, as assayed by surface area analysis (BET). Thermogravimetric analysis showed a 18%-mass of silica on the surface of Ag@SiO2NPs. Transmission electron microscopy (TEM) displayed the spherical shape of nanoparticles and average size of 11 nm for GT-AgNPs and Ag@SiO2NPs. Ag@SiO2NPs demonstrated potent antimicrobial action against S. mutans, with MIC determined as 600 μg/mL, and inhibition of approximately 44% (p < 0.05) of biofilm formation. At the MIC concentrations, both NPs did not exhibit cytotoxicity. CONCLUSION Ag@SiO2NPs might have a useful application in dental materials. CLINICAL SIGNIFICANCE The possibility of incorporating antimicrobial properties in restorative materials without compromising esthetics makes the AgNPs@SiO2 NPs promising agents against S. mutans biofilm formation, hence the prevention of dental caries. This represents a great step towards the development of more interactive biomaterials in dentistry to overcome clinical problems.
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Affiliation(s)
- Marcela Charantola Rodrigues
- Postgraduate Department of Cruzeiro do Sul University (UNICSUL), Galvão Bueno St., 868, 01506-000, São Paulo, SP, Brazil; Municipal University of São Caetano do Sul (USCS), Santo Antônio St., 50, 09521-160, São Caetano do Sul, SP, Brazil.
| | - Wallace Rosado Rolim
- Center for Natural and Human Sciences (CCNH), Federal University of ABC (UFABC), dos Estados Ave., 5001, 09210-580, Santo André, SP, Brazil
| | - Marina Mariante Viana
- Postgraduate Department of Cruzeiro do Sul University (UNICSUL), Galvão Bueno St., 868, 01506-000, São Paulo, SP, Brazil
| | - Thaís Rodrigues Souza
- Postgraduate Department of Cruzeiro do Sul University (UNICSUL), Galvão Bueno St., 868, 01506-000, São Paulo, SP, Brazil
| | - Flavia Gonçalves
- Ibirapuera University (UNIB), Interlagos Ave., 1329, 04661-100, São Paulo, SP, Brazil
| | - Caio Junji Tanaka
- Dental Research Division, Guarulhos University, Teresa Cristina Square, 229, 07023-070, Guarulhos, SP, Brazil
| | - Bruno Bueno-Silva
- Dental Research Division, Guarulhos University, Teresa Cristina Square, 229, 07023-070, Guarulhos, SP, Brazil
| | - Amedea Barozzi Seabra
- Center for Natural and Human Sciences (CCNH), Federal University of ABC (UFABC), dos Estados Ave., 5001, 09210-580, Santo André, SP, Brazil
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Viana MM, do Amaral SF, Nakao E, Rodrigues MC. Conservative approach to the restoration of vital teeth affected by severe tissue wear. J Prosthet Dent 2020; 123:191-195. [DOI: 10.1016/j.prosdent.2018.10.032] [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] [Received: 05/16/2018] [Revised: 10/15/2018] [Accepted: 10/15/2018] [Indexed: 11/28/2022]
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Ferreira SBP, Viana MM, Maia NGF, Leão LL, Machado RA, Coletta RD, de Aguiar MJB, Martelli-Junior H. Oral findings in Williams-Beuren syndrome. Med Oral Patol Oral Cir Bucal 2017; 23:e1-e6. [PMID: 29274148 PMCID: PMC5822531 DOI: 10.4317/medoral.21834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 10/01/2017] [Indexed: 11/05/2022] Open
Abstract
Background Material and Methods Results Conclusions
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Viana MM, De Marco LA, Boson WL, Romano-Silva MA, Corrêa H. Investigation of A218C tryptophan hydroxylase polymorphism: association with familial suicide behavior and proband's suicide attempt characteristics. Genes Brain Behav 2006; 5:340-5. [PMID: 16716203 DOI: 10.1111/j.1601-183x.2005.00171.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
According to WHO, suicide accounts for about 1,000,000 deaths worldwide every year. In view of these dramatic data, several studies have tried to identify possible biological mechanisms and markers of suicide. Genes encoding for proteins involved in the serotonergic transmission are major candidates in association studies of suicidal behavior. The gene that codes for tryptophan hydroxylase (TPH), the rate-limiting enzyme in the biosynthesis of serotonin, is one of these candidates. Two polymorphisms in intron 7 of this gene (A218C and A779C) have been described, but their role in suicidal behavior remains uncertain. TPH A218C polymorphism was analyzed in a sample of 248 psychiatric patients and 63 healthy controls. In addition, at least one close relative member was interviewed to assess family suicidal behavior history. Our research confirmed that a positive history of suicide attempts in a family member is associated with the chance of an individual to attempt suicide. Furthermore, we demonstrated that familial suicide attempts are more lethal and frequently more violent. We were not able to find significant differences of the TPH genotype frequencies between patients and controls. The TPH A218C genotypes were not associated with a history of suicide attempt and the lethality of the most lethal lifetime suicide attempt and suicide attempt method. The authors conclude that the A218C polymorphism of the TPH gene may not be a susceptibility factor for suicidal behavior in this group of psychiatric patients but confirm that a family suicidal behavior history increases the proband's suicide attempt risk.
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Affiliation(s)
- M M Viana
- Department of Pharmacology, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil
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Correa H, Campi-Azevedo AC, De Marco L, Boson W, Viana MM, Guimarães MM, Costa E, Miranda DM, Romano-Silva MA. Familial suicide behaviour: association with probands suicide attempt characteristics and 5-HTTLPR polymorphism. Acta Psychiatr Scand 2004; 110:459-64. [PMID: 15521831 DOI: 10.1111/j.1600-0447.2004.00340.x] [Citation(s) in RCA: 25] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE There is compelling evidence that a serotonergic dysfunction may play a major role in suicide behaviour and it has also been demonstrated that suicide is, at least partially, genetically determined. Thus, the serotonin-related genes are the major candidates. Previously a functional polymorphism in the promoter region of the serotonin transporter gene (5-HTTLPR) was identified and the presence of the short allele (S) was found to be associated with a lower level of expression of the gene and lower levels of 5-HT uptake when compared with the long allele (L). The purpose of this study was to evaluate the association between family suicide behaviour history and probands' suicide attempt (SA) history, SA characteristics and 5-HTTLPR genotype. METHOD We genotyped 237 probands (major depressed or schizophrenic patients) and used a semistructured interview to determine probands' SA characteristics and first- and second-degree family suicidal behaviour. RESULTS An association between suicidal family history and proband's SA but not with SA characteristics and probands genotype was found. CONCLUSION Our results suggest that multiple biological and environmental factors underlie familial transmission of suicidal behaviour.
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Affiliation(s)
- H Correa
- Laboratório de Farmacogenética, ICB, UFMG, Belo Horizonte, Brazil.
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Querol X, Alastuey A, Rodríguez S, Viana MM, Artíñano B, Salvador P, Mantilla E, García do Santos S, Fernandez Patier R, de La Rosa J, Sanchez de la Campa A, Menéndez M, Gil JJ. Levels of particulate matter in rural, urban and industrial sites in Spain. Sci Total Environ 2004; 334-335:359-376. [PMID: 15504522 DOI: 10.1016/j.scitotenv.2004.04.036] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/01/2004] [Indexed: 05/24/2023]
Abstract
This paper summarises the results of a series of studies on the interpretation of time series of levels of total suspended particles (TSP) and particulate matter (PM, <10 microm) in six regions of Spain in the period 1996-2000. In addition to the local pollution events, high PM10 episodes are recorded during African dust outbreaks, regional atmospheric recirculation events (mainly in spring to autumn), and to a lesser extent, under the influence of European and Mediterranean long range transported air masses. The lowest PM10 levels are usually recorded under Atlantic air mass advective conditions. All these regional and large-scale processes account for the relatively high PM10 levels recorded in regional background stations in Spain. Thus, the PM10 levels recorded at EMEP (Cooperative Program for Monitoring and Evaluation of the Long Range Transmission of Air Pollutants in Europe) regional background stations between March 2001 and March 2002 are very close to the annual limit value proposed for 2010 by the EU Air Quality Directive 1999/30/CE. Chemical data obtained for the different monitoring stations during 2001 show a high mineral load in PM10 for most of the study sites in Spain. Furthermore, a high marine aerosol load is evidenced in the Canary Islands. These mineral and marine loads are lower when considering PM2.5, but a relatively high proportion (8-21%) of mineral dust is still present.
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Affiliation(s)
- X Querol
- Instituto de Ciencias de la Tierra del CSIC, C/Luis Solé y Sabaris s/n, 08028 Barcelona, Spain.
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Correa H, De Marco L, Boson W, Viana MM, Lima VFS, Campi-Azevedo AC, Noronha JCM, Guatimosim C, Romano-Silva MA. Analysis of T102C 5HT2A polymorphism in Brazilian psychiatric inpatients: relationship with suicidal behavior. Cell Mol Neurobiol 2002; 22:813-7. [PMID: 12585698 DOI: 10.1023/a:1021873411611] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [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]
Abstract
1. Central serotonergic dysfunction and genetic factors are associated with suicidal behavior in psychiatric patients. The goal of this study was to examine the association between the 5-HT2A gene polymorphism (102T/C) and suicide in a sample of Brazilian psychiatric inpatients. 2. We studied 225 subjects. Genotypic frequencies were obtained after DNA extraction and the region of 5-HT2A/T102C containing the polymorphic site amplified by the polymerase chain reaction and digested with the restriction enzyme HpaII. 3. No differences were found between patients with and without suicide attempt history. Patients with a history of severe suicide attempts also did not exhibit different genotypic frequencies when compared with patients without a suicide attempt history. 4. These results suggest that the 5HT2A gene polymorphism (102T/C) may not be involved in the genetic susceptibility to suicidal behavior.
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Affiliation(s)
- H Correa
- Department of Morfologia, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Brazil.
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Rodríguez-Camarero SJ, Menéndez AI, Rodero JI, Alvarez JL, Cermeño B, Viana MM. [The surgical treatment of an aneurysm of the celiac trunk and hepatic artery]. Angiologia 1993; 45:125-30. [PMID: 8239039] [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: 01/29/2023]
Abstract
We report a case of splenic aneurysms with double location, at the celiac trunks and at the common hepatic artery, in the same patient that was treated by a surgical procedure. We also review literature about the hepatic aneurysms at the celiac trunks, with special attention on the aspects of etiology, natural evolutions and different surgical procedures available. It is remarkable on this kind of pathology that special attention should be paid in order to avoid the simple ligature-exclusion of the aneurysm, it involves realizing an endoaneurysmorrhaphy followed by an aorto-hepatic by-pass.
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Affiliation(s)
- S J Rodríguez-Camarero
- Servicio de Angiología y Cirurgía Vascular del Area Sanitaria de Alava, Hospital Txagorritxu, Vitoria-Gasteiz, España
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