The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Debora Barros Barbosa - One of the best experts on this subject based on the ideXlab platform.
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Silver Distribution and Release from an Antimicrobial Denture Base Resin Containing Silver Colloidal Nanoparticles
Journal of Prosthodontics, 2012Co-Authors: Douglas Roberto Monteiro, Emerson R. Camargo, Aline Satie Takamiya, Luiz Fernando Gorup, Adhemar Colla Ruvolo Filho, Debora Barros BarbosaAbstract:PURPOSE: The aim of this study was to evaluate a denture Base Resin containing silver colloidal nanoparticles through morphological analysis to check the distribution and dispersion of these particles in the polymer and by testing the silver release in deionized water at different time periods.\n\nMATERIALS AND METHODS: A Lucitone 550 denture Resin was used, and silver nanoparticles were synthesized by reduction of silver nitrate with sodium citrate. The acrylic Resin was prepared in accordance with the manufacturers' instructions, and silver nanoparticle suspension was added to the acrylic Resin monomer in different concentrations (0.05, 0.5, and 5 vol% silver colloidal). Controls devoid of silver nanoparticles were included. The specimens were stored in deionized water at 37°C for 7, 15, 30, 60, and 120 days, and each solution was analyzed using atomic absorption spectroscopy.\n\nRESULTS: Silver was not detected in deionized water regardless of the silver nanoparticles added to the Resin and of the storage period. Micrographs showed that with lower concentrations, the distribution of silver nanoparticles was reduced, whereas their dispersion was improved in the polymer. Moreover, after 120 days of storage, nanoparticles were mainly located on the surface of the nanocomposite specimens.\n\nCONCLUSIONS: Incorporation of silver nanoparticles in the acrylic Resin was evidenced. Moreover, silver was not detected by the detection limit of the atomic absorption spectrophotometer used in this study, even after 120 days of storage in deionized water. Silver nanoparticles are incorporated in the PMMA denture Resin to attain an effective antimicrobial material to help control common infections involving oral mucosal tissues in complete denture wearers.
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The effect of polymerization cycles on porosity of microwave-processed denture Base Resin
Journal of Prosthetic Dentistry, 2004Co-Authors: Marco Antonio Compagnoni, Debora Barros Barbosa, Raphael Freitas De Souza, Ana Carolina PeroAbstract:Abstract Statement of problem Although most of the physical properties of denture Base Resin polymerized by microwave energy have been shown to be similar to Resins polymerized by the conventional heat polymerization method, the presence of porosity is a problem. Purpose This study evaluated the effect of different microwave polymerization cycles on the porosity of a denture Base Resin designed for microwave polymerization. Material and methods Thirty-two rectangular Resin specimens (65×40×5 mm) were divided into 3 experimental groups (A, B, and C; Onda-Cryl, microwave-polymerized Resin) and 1 control group (T; Classico, heat-polymerized Resin), according to the following polymerization cycles: (A) 500 W for 3 minutes, (B) 90 W for 13 minutes + 500 W for 90 seconds, (C) 320 W for 3 minutes + 0 W for 4 minutes + 720 W for 3 minutes, and (T) 74°C for 9 hours. Porosity was calculated by measurement of the specimen volume before and after its immersion in water. Data were analyzed using 1-way analysis of variance (α = .05). Results The mean values and SDs of the percent mean porosity were: A = 1.05%±0.28%, B = 0.91%±0.15%, C = 0.88%±0.23%, T = 0.93%±0.23%. No significant differences were found in mean porosity among the groups evaluated. Conclusion Within the limitations of this study, a denture Base Resin specifically designed for microwave polymerization tested was not affected by different polymerization cycles. Porosity was similar to the conventional heat-polymerized denture Base Resin tested.
D B Barbosa - One of the best experts on this subject based on the ideXlab platform.
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silver distribution and release from an antimicrobial denture Base Resin containing silver colloidal nanoparticles
Journal of Prosthodontics, 2012Co-Authors: Douglas Roberto Monteiro, Emerson R. Camargo, Aline Satie Takamiya, Luiz Fernando Gorup, Adhemar Ruvolo C Filho, D B BarbosaAbstract:Purpose: The aim of this study was to evaluate a denture Base Resin containing silver colloidal nanoparticles through morphological analysis to check the distribution and dispersion of these particles in the polymer and by testing the silver release in deionized water at different time periods. Materials and Methods: A Lucitone 550 denture Resin was used, and silver nanoparticles were synthesized by reduction of silver nitrate with sodium citrate. The acrylic Resin was prepared in accordance with the manufacturers’ instructions, and silver nanoparticle suspension was added to the acrylic Resin monomer in different concentrations (0.05, 0.5, and 5 vol% silver colloidal). Controls devoid of silver nanoparticles were included. The specimens were stored in deionized water at 37°C for 7, 15, 30, 60, and 120 days, and each solution was analyzed using atomic absorption spectroscopy. Results: Silver was not detected in deionized water regardless of the silver nanoparticles added to the Resin and of the storage period. Micrographs showed that with lower concentrations, the distribution of silver nanoparticles was reduced, whereas their dispersion was improved in the polymer. Moreover, after 120 days of storage, nanoparticles were mainly located on the surface of the nanocomposite specimens. Conclusions: Incorporation of silver nanoparticles in the acrylic Resin was evidenced. Moreover, silver was not detected by the detection limit of the atomic absorption spectrophotometer used in this study, even after 120 days of storage in deionized water. Silver nanoparticles are incorporated in the PMMA denture Resin to attain an effective antimicrobial material to help control common infections involving oral mucosal tissues in complete denture wearers.
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the effect of polymerization cycles on porosity of microwave processed denture Base Resin
Journal of Prosthetic Dentistry, 2004Co-Authors: Marco Antonio Compagnoni, D B Barbosa, Raphael Freitas De Souza, Ana Carolina PeroAbstract:STATEMENT OF PROBLEM: Although most of the physical properties of denture Base Resin polymerized by microwave energy have been shown to be similar to Resins polymerized by the conventional heat polymerization method, the presence of porosity is a problem. PURPOSE: This study evaluated the effect of different microwave polymerization cycles on the porosity of a denture Base Resin designed for microwave polymerization. MATERIAL AND METHODS: Thirty-two rectangular Resin specimens (65 x 40 x 5 mm) were divided into 3 experimental groups (A, B, and C; Onda-Cryl, microwave-polymerized Resin) and 1 control group (T; Classico, heat-polymerized Resin), according to the following polymerization cycles: (A) 500 W for 3 minutes, (B) 90 W for 13 minutes+500 W for 90 seconds, (C) 320 W for 3 minutes+0 W for 4 minutes+720 W for 3 minutes, and (T) 74 degrees C for 9 hours. Porosity was calculated by measurement of the specimen volume before and after its immersion in water. Data were analyzed using 1-way analysis of variance (alpha=.05). RESULTS: The mean values and SDs of the percent mean porosity were: A=1.05%+/-0.28%, B=0.91%+/-0.15%, C=0.88%+/-0.23%, T=0.93%+/-0.23%. No significant differences were found in mean porosity among the groups evaluated. CONCLUSION: Within the limitations of this study, a denture Base Resin specifically designed for microwave polymerization tested was not affected by different polymerization cycles. Porosity was similar to the conventional heat-polymerized denture Base Resin tested.
Douglas Roberto Monteiro - One of the best experts on this subject based on the ideXlab platform.
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Silver Distribution and Release from an Antimicrobial Denture Base Resin Containing Silver Colloidal Nanoparticles
Journal of Prosthodontics, 2012Co-Authors: Douglas Roberto Monteiro, Emerson R. Camargo, Aline Satie Takamiya, Luiz Fernando Gorup, Adhemar Colla Ruvolo Filho, Debora Barros BarbosaAbstract:PURPOSE: The aim of this study was to evaluate a denture Base Resin containing silver colloidal nanoparticles through morphological analysis to check the distribution and dispersion of these particles in the polymer and by testing the silver release in deionized water at different time periods.\n\nMATERIALS AND METHODS: A Lucitone 550 denture Resin was used, and silver nanoparticles were synthesized by reduction of silver nitrate with sodium citrate. The acrylic Resin was prepared in accordance with the manufacturers' instructions, and silver nanoparticle suspension was added to the acrylic Resin monomer in different concentrations (0.05, 0.5, and 5 vol% silver colloidal). Controls devoid of silver nanoparticles were included. The specimens were stored in deionized water at 37°C for 7, 15, 30, 60, and 120 days, and each solution was analyzed using atomic absorption spectroscopy.\n\nRESULTS: Silver was not detected in deionized water regardless of the silver nanoparticles added to the Resin and of the storage period. Micrographs showed that with lower concentrations, the distribution of silver nanoparticles was reduced, whereas their dispersion was improved in the polymer. Moreover, after 120 days of storage, nanoparticles were mainly located on the surface of the nanocomposite specimens.\n\nCONCLUSIONS: Incorporation of silver nanoparticles in the acrylic Resin was evidenced. Moreover, silver was not detected by the detection limit of the atomic absorption spectrophotometer used in this study, even after 120 days of storage in deionized water. Silver nanoparticles are incorporated in the PMMA denture Resin to attain an effective antimicrobial material to help control common infections involving oral mucosal tissues in complete denture wearers.
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silver distribution and release from an antimicrobial denture Base Resin containing silver colloidal nanoparticles
Journal of Prosthodontics, 2012Co-Authors: Douglas Roberto Monteiro, Emerson R. Camargo, Aline Satie Takamiya, Luiz Fernando Gorup, Adhemar Ruvolo C Filho, D B BarbosaAbstract:Purpose: The aim of this study was to evaluate a denture Base Resin containing silver colloidal nanoparticles through morphological analysis to check the distribution and dispersion of these particles in the polymer and by testing the silver release in deionized water at different time periods. Materials and Methods: A Lucitone 550 denture Resin was used, and silver nanoparticles were synthesized by reduction of silver nitrate with sodium citrate. The acrylic Resin was prepared in accordance with the manufacturers’ instructions, and silver nanoparticle suspension was added to the acrylic Resin monomer in different concentrations (0.05, 0.5, and 5 vol% silver colloidal). Controls devoid of silver nanoparticles were included. The specimens were stored in deionized water at 37°C for 7, 15, 30, 60, and 120 days, and each solution was analyzed using atomic absorption spectroscopy. Results: Silver was not detected in deionized water regardless of the silver nanoparticles added to the Resin and of the storage period. Micrographs showed that with lower concentrations, the distribution of silver nanoparticles was reduced, whereas their dispersion was improved in the polymer. Moreover, after 120 days of storage, nanoparticles were mainly located on the surface of the nanocomposite specimens. Conclusions: Incorporation of silver nanoparticles in the acrylic Resin was evidenced. Moreover, silver was not detected by the detection limit of the atomic absorption spectrophotometer used in this study, even after 120 days of storage in deionized water. Silver nanoparticles are incorporated in the PMMA denture Resin to attain an effective antimicrobial material to help control common infections involving oral mucosal tissues in complete denture wearers.
Zhang Fu-qiang - One of the best experts on this subject based on the ideXlab platform.
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Influence of Nano-Silver Base Inorganic Antimicrobial on Denture Base Resin
Journal of Shanghai Jiaotong University, 2020Co-Authors: Zhang Fu-qiangAbstract:Objective To explore the influence of nano-silver Base inorganic antimicrobial on denture Base Resin.(Methods)The experimental groups of denture Base Resin were mixed with the nano-silver Base inorganic antimicrobial FUMAT T200-4,whose incorporating doses were 0%(control),1%,2%,3%,4%,5%,7% and 10%(V/V).Antimicrobial properties against Streptococcus mutans and Candida albicans were assayed with the pellicle-sticking(method.) Results The experimental groups had good inhibitory effect on Streptococcus mutans and Candida albicans.The inhibition percents for Streptococcus mutans of each group(1%-10%) were 24.5%,73.3%,80.2%,(87.2%,) 90.7%,96.5% and 100%,and those for Candida albicans were 26.3%,46.7%,53.3%,63.1%,(69.9%,) 73.2% and 79.8%,respectively.The antimicrobial properties of the denture Base Resin were strengthened with the increasing doses of the antimicrobial. Conclusion Denture Base Resin incorporated with nano-silver Base inorganic antimicrobial enjoys good antimicrobial properties.
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Influence of Nano-Silver Base Inorganic Antimicrobial on Cytotoxicity of Denture Base Resin
Journal of Shanghai Jiaotong University, 2020Co-Authors: Zhang Fu-qiangAbstract:Objective To explore the influence of nano-silver Base inorganic antimicrobial on cytotoxicity of nano-antimicrobial denture Base Resin. Methods The experimental groups of denture Base Resin were mixed with the nano-silver Base inorganic antimicrobial FUMAT T200-4,whose incorporating doses were 0%(control),1%,2%,3%,4%,5%,7% and 10%(V/V).Cytotoxicity in vitro on rat's fibroblast was assayed with MTT method,and the grades were compared. Results After 2,4 and 7days,the grades of cytotoxicity were 0 or 1,and the cell rela-(tive growth) rates of experimental groups were 93.4%-105.9%,114.2%-147.1% and 131.8%-148.8%.(Conclusion)When the incorporation ratios of the nano-silver Base inorganic antimicrobial FUMAT T200-4 were 10% or fewer,the nano-antimicrobial denture Base Resin does not have cytotoxicity on small rat's fibroblast and shows good biocompatibility.
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Influence of Nano-Silver Base Inorganic Antimicrobial on Mechanical Properties of Denture Base Resin
Journal of Shanghai Jiaotong University, 2020Co-Authors: Xia Liang-wei, Jiang Wei-dong, Zhang Fu-qiangAbstract:Objective To explore the influence of nano-silver Base inorganic antimicrobial on mechanical properties of denture Base Resin. Methods The experimental groups were denture Base Resin mixed with the nano-silver Base inorganic antimicrobial FUMAT T200-4,whose incorporating doses were 0%(control),1%,2%,3%,4%,5%,7% and 10%(V/V).The mechanical properties such as deflection,flexure strength,flexure modulus and impact strength were measured according to the national standards. Results The mechanical properties of the nano-antimicrobial denture Base Resin changed partially.Although the deflection didn't change,the flexure strength and the impact strength decreased and the flexure modulus increased.When the incorporating dose reached 1%,the impact strength of the experimental group was(7.05±1.80) kJ/m~(2),which was significantly less than the control group([10.01±1.86] kJ/m~(2)).For the 4% experimental group,the flexure strength was(95.96±5.05)MPa,significantly less than the control group([108.14±9.47] MPa).For the 5% experimental group,the flexure modulus was((2 594.00)±40.21) MPa,significantly more than the control group([2 533.60±62.83] MPa). Conclusion(The incorporating) dose of the nano-silver Base inorganic antimicrobial must be controlled reasonably in order to minish the influence on the mechanical properties of nano-antimicrobial denture Base Resin.
Luiz Fernando Gorup - One of the best experts on this subject based on the ideXlab platform.
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Silver Distribution and Release from an Antimicrobial Denture Base Resin Containing Silver Colloidal Nanoparticles
Journal of Prosthodontics, 2012Co-Authors: Douglas Roberto Monteiro, Emerson R. Camargo, Aline Satie Takamiya, Luiz Fernando Gorup, Adhemar Colla Ruvolo Filho, Debora Barros BarbosaAbstract:PURPOSE: The aim of this study was to evaluate a denture Base Resin containing silver colloidal nanoparticles through morphological analysis to check the distribution and dispersion of these particles in the polymer and by testing the silver release in deionized water at different time periods.\n\nMATERIALS AND METHODS: A Lucitone 550 denture Resin was used, and silver nanoparticles were synthesized by reduction of silver nitrate with sodium citrate. The acrylic Resin was prepared in accordance with the manufacturers' instructions, and silver nanoparticle suspension was added to the acrylic Resin monomer in different concentrations (0.05, 0.5, and 5 vol% silver colloidal). Controls devoid of silver nanoparticles were included. The specimens were stored in deionized water at 37°C for 7, 15, 30, 60, and 120 days, and each solution was analyzed using atomic absorption spectroscopy.\n\nRESULTS: Silver was not detected in deionized water regardless of the silver nanoparticles added to the Resin and of the storage period. Micrographs showed that with lower concentrations, the distribution of silver nanoparticles was reduced, whereas their dispersion was improved in the polymer. Moreover, after 120 days of storage, nanoparticles were mainly located on the surface of the nanocomposite specimens.\n\nCONCLUSIONS: Incorporation of silver nanoparticles in the acrylic Resin was evidenced. Moreover, silver was not detected by the detection limit of the atomic absorption spectrophotometer used in this study, even after 120 days of storage in deionized water. Silver nanoparticles are incorporated in the PMMA denture Resin to attain an effective antimicrobial material to help control common infections involving oral mucosal tissues in complete denture wearers.
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silver distribution and release from an antimicrobial denture Base Resin containing silver colloidal nanoparticles
Journal of Prosthodontics, 2012Co-Authors: Douglas Roberto Monteiro, Emerson R. Camargo, Aline Satie Takamiya, Luiz Fernando Gorup, Adhemar Ruvolo C Filho, D B BarbosaAbstract:Purpose: The aim of this study was to evaluate a denture Base Resin containing silver colloidal nanoparticles through morphological analysis to check the distribution and dispersion of these particles in the polymer and by testing the silver release in deionized water at different time periods. Materials and Methods: A Lucitone 550 denture Resin was used, and silver nanoparticles were synthesized by reduction of silver nitrate with sodium citrate. The acrylic Resin was prepared in accordance with the manufacturers’ instructions, and silver nanoparticle suspension was added to the acrylic Resin monomer in different concentrations (0.05, 0.5, and 5 vol% silver colloidal). Controls devoid of silver nanoparticles were included. The specimens were stored in deionized water at 37°C for 7, 15, 30, 60, and 120 days, and each solution was analyzed using atomic absorption spectroscopy. Results: Silver was not detected in deionized water regardless of the silver nanoparticles added to the Resin and of the storage period. Micrographs showed that with lower concentrations, the distribution of silver nanoparticles was reduced, whereas their dispersion was improved in the polymer. Moreover, after 120 days of storage, nanoparticles were mainly located on the surface of the nanocomposite specimens. Conclusions: Incorporation of silver nanoparticles in the acrylic Resin was evidenced. Moreover, silver was not detected by the detection limit of the atomic absorption spectrophotometer used in this study, even after 120 days of storage in deionized water. Silver nanoparticles are incorporated in the PMMA denture Resin to attain an effective antimicrobial material to help control common infections involving oral mucosal tissues in complete denture wearers.
