Detection and Estimation of Monomeric Eluates from Poly(Methyl Methacrylate) Resin of Various Polymerisation Modes

2007 ◽  
Vol 15 (7) ◽  
pp. 553-560
Author(s):  
Wala M. Amin
Keyword(s):  
Methyl Methacrylate ◽  
High Performance ◽  
Soft Tissues ◽  
Artificial Saliva ◽  
Ultra Violet ◽  
Distilled Water ◽  
Elution Profile ◽  
Poly Methyl Methacrylate ◽  
Methacrylate Monomer ◽  
Methyl Methacrylate Monomer

High-performance liquid chromatography coupled to an ultra-violet detector method was used to monitor the elution profile of methyl methacrylate monomer from poly (methyl methacrylate) resin produced by various polymerization modes. Three types of polymer were investigated, one auto-polymerised, one heat-polymerised, and a microwave-polymerised resin type. The study was conducted on five discs from each type in both distilled water and artificial saliva. The results showed that the three resins demonstrated a rapid dumping of their residual methacrylic acid whereas their un-polymerised methyl methacrylate monomer continued to leach out to both artificial saliva and distilled water throughout the five-week test period. It was shown that the three resins differed significantly (p< 0.05) in the elution profile of their methyl methacrylate, with the microwave-polymerised type showing the highest amount of leached out monomer whereas the heat-polymerised type showed the lowest amount of monomer diffusion. The results also showed that the amount of eluates leached out from the investigated polymers into the artificial saliva was larger than into water. The findings of this study warned that the risk of a chemical trauma to the oral soft tissues is significant and imminent immediately after delivery of a newly constructed prosthesis. Such a trauma, however, could be substantially minimised by immersing the oral appliances in water for one week before insertion.

scholarly journals Effect of Ferocene Concentration on the Percent Conversion and Molecular Weight of Poly(Methyl Methacrylate) Homopolymers

2017 ◽  
Vol 14 (2) ◽  
pp. 311-319
Author(s):  
Baghdad Science Journal
Keyword(s):  
Molecular Weight ◽  
Free Radical ◽  
Methyl Methacrylate ◽  
Benzoyl Peroxide ◽  
Radical Polymerization ◽  
Free Oxygen ◽  
Poly Methyl Methacrylate ◽  
Methacrylate Monomer ◽  
Percent Conversion ◽  
Methyl Methacrylate Monomer

This research is addressing the effect of different ferrocene concentration (0.00, 2.15x10-3, 4.30x10-3, 8.60x10-3, and 12.9x10-3) on the bulk free radical polymerization of methyl methacrylate monomer in benzene using benzoyl peroxide as initiator. The polymerization was conducted at 60º C under free oxygen atmosphere. The resulting polymers were characterized by FTIR. The results were compared with the presence and absence of ferrocene at 10% conversion. The %conversion was 3.04% with no ferrocene present in the polymerization medium and its increase to 9.06 with a first lowest ferrocene concentration added, i.e. 2.15 x10-3mol/l. This was positively reflected on the poly(methyl methacrylate) molecular weight measured by viscosity technique, especially in the presence of ferrocene.

scholarly journals A New Form of Intraoral Delivery of Antifungal Drugs for the Treatment of Denture-Induced Oral Candidosis

2009 ◽  
Vol 03 (04) ◽  
pp. 257-266 ◽  
Author(s):  
Wala M. Amin ◽  
Muna H. Al-Ali ◽  
Nesreen A. Salim ◽  
Sandra K. Al-Tarawneh
Keyword(s):  
Candida Albicans ◽  
Methyl Methacrylate ◽  
Fungal Infections ◽  
Ultra Violet ◽  
Antifungal Drugs ◽  
Distilled Water ◽  
Clinical Value ◽  
Sustained Drug Release ◽  
Poly Methyl Methacrylate ◽  
Pmma Resin

ABSTRACTObjectives: To monitor the release of the antifungal drugs Fluconazole, Chlorhexidine and a combination of the two from an auto-polymerized poly (methyl methacrylate) (PMMA) denture base resin; and to investigate the effect of the released drugs upon the growth of Candida albicans.Methods: A high performance liquid chromatography-Ultra violet (HPLC-UV) method was used in the analysis of the released drugs into distilled water from PMMA discs doped with the antifungal drugs Fluconazole (10%), Chlorhexidine (10%) and a combination of the two drugs (5% each). The antifungal efficacy of the released drugs was monitored, microbiologically, employing “well” technique on a Saborauds culture medium inoculated with a resistant strain of Candida albicans.Results: It was shown that Fluconazole, Chlorhexidine and the combination of the two drugs can be successfully incorporated with PMMA. It was found that the drugs leach steadily out of the PMMA resin into distilled water at mouth temperature and that sustained drug release continued throughout the 28 days test period. It was also shown that the released drugs demonstrated an antifungal activity against the resistant Candida albicans and this was most remarkable in the combined drugs samples.Conclusions: The findings of this investigation have a clinical value in terms of their significant contribution to the treatment of fungal infections of the oral cavity. The sustained release of antifungal drugs from the PMMA resin clearly constitutes a new dosage form of these drugs via the poly (methyl methacrylate) delivery system. (Eur J Dent 2009;3:257-266)

Graphene-Poly(Methyl Methacrylate) Composites Prepared by Two Methods

2011 ◽  
Vol 335-336 ◽  
pp. 49-53 ◽  
Author(s):  
Lin Lei ◽  
Jian Hui Qiu ◽  
Xue Li Wu ◽  
Yang Zhao ◽  
Eiichi Sakai
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Methyl Methacrylate ◽  
Graphite Oxide ◽  
Graphene Nanosheet ◽  
Poly Methyl Methacrylate ◽  
Transmission Electron ◽  
Methacrylate Monomer ◽  
Methyl Methacrylate Monomer ◽  
Scanning Electron

Graphene-poly(methyl methacrylate) (GNS-PMMA) composites were prepared by two methods. Graphite oxide nanosheet-poly(methyl methacrylate) (GO-PMMA) composites were prepared of methyl methacrylate monomer and the presence of graphite oxide (GO). Then the GO-PMMA composites were reduced to graphene nanosheet-poly(methyl methacrylate) by using hydrazine hydrate. The obtained composites were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). The composite exhibited conductivities in the 1.58×10-9-4.21 S/cm range, depending on the amounts of graphite oxide and PMMA.

scholarly journals Surface Functionalization of an Aluminum Alloy to Generate an Antibiofilm Coating Based on Poly(Methyl Methacrylate) and Silver Nanoparticles

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2747 ◽  
Author(s):  
Lisa Muñoz ◽  
Laura Tamayo ◽  
Miguel Gulppi ◽  
Franco Rabagliati ◽  
Marcos Flores ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Aluminum Alloy ◽  
Methyl Methacrylate ◽  
In Situ Polymerization ◽  
Polymerization Reaction ◽  
Experimental Protocol ◽  
Poly Methyl Methacrylate ◽  
Methacrylate Monomer ◽  
Methyl Methacrylate Monomer

An experimental protocol was studied to improve the adhesion of a polymeric poly(methyl methacrylate) coating that was modified with silver nanoparticles to an aluminum alloy, AA2024. The nanoparticles were incorporated into the polymeric matrix to add the property of inhibiting biofilm formation to the anticorrosive characteristics of the film, thus also making the coating antibiocorrosive. The protocol consists of functionalizing the surface through a pseudotransesterification treatment using a methyl methacrylate monomer that bonds covalently to the surface and leaves a terminal double bond that promotes and directs the polymerization reaction that takes place in the process that follows immediately after. This results in more compact and thicker poly(methyl methacrylate) (PMMA) coatings than those obtained without pseudotransesterification. The poly(methyl methacrylate) matrix modified with nanoparticles was obtained by incorporating both the nanoparticles and the methyl methacrylate in the reactor. The in situ polymerization involved combining the pretreated AA2024 specimens combined with the methyl methacrylate monomer and AgNps. The antibiofilm capacity of the coating was evaluated against P. aeruginosa, with an excellent response. Not only did the presence of bacteria decrease, but the formation of the exopolymer subunits was 99.99% lower than on the uncoated aluminum alloy or the alloy coated with unmodified poly(methyl methacrylate). As well and significantly, the potentiodynamic polarization measurements indicate that the PMMA-Ag coating has a good anticorrosive property in a 0.1-M NaCl medium.

Hybrid Dynamic Coating withn-Dodecylβ-d-Maltoside and Methyl Cellulose for High-Performance Carbohydrate Analysis on Poly(methyl methacrylate) Chips

2006 ◽  
Vol 78 (5) ◽  
pp. 1452-1458 ◽  
Author(s):  
Fuquan Dang ◽  
Kazuaki Kakehi ◽  
Jingjun Cheng ◽  
Osamu Tabata ◽  
Masaya Kurokawa ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
High Performance ◽  
Methyl Cellulose ◽  
Dynamic Coating ◽  
Carbohydrate Analysis ◽  
Poly Methyl Methacrylate

scholarly journals Removable partial or complete dentures exposed to beverages and mouthwashes: evaluation of microhardness and roughness

2015 ◽  
Vol 44 (4) ◽  
pp. 189-194 ◽  
Author(s):  
Fernanda Alves Feitosa ◽  
Mateus Guimarães Lage Reggiani ◽  
Rodrigo Máximo de Araújo
Keyword(s):  
Methyl Methacrylate ◽  
Artificial Saliva ◽  
Soft Drink ◽  
Initial Period ◽  
Lemon Juice ◽  
Chlorhexidine Gluconate ◽  
Denture Base ◽  
Mean Values ◽  
Poly Methyl Methacrylate ◽  
The Mean

<title>Abstract</title><sec><title>Purpose</title><p>To evaluate microhardness and roughness of denture base polymethylmethacrylate resinn exposed to acid beverages and mouthwashes.</p></sec><sec><title>Material and method</title><p>Rectangular samples (n=80) were prepared from poly (methyl methacrylate) (PMMA). They were divided into 8 groups and had the initial microhardness and Knoop roughness measured. Samples of each group were immersed for 10 min into a test solution (coffee, lemon juice, chlorhexidine gluconate, red wine, cola-based soft drink, vinegar or antiseptic with and without alcohol) and after stored in artificial saliva for 23 h and 50 min, completing a period of 24 h. This procedure was performed for 14 consecutive days and after this period the microhardness and surface roughness measurements were made again. Data were statistically analyzed using ANOVA non parametric, Kruskal-Walis and the Dunn´s test for microhardness and the t-Student and ANOVA for roughness.</p></sec><sec><title>Result</title><p>For microhardness there were found statistically significant differences among the chlorhexidine gluconate solution, antiseptic without alcohol and cola-based soft drink. For roughness was observed that the mean values between the initial period and after immersion in the test products differed statistically in all groups, without difference among groups.</p></sec><sec><title>Conclusion</title><p>The microhardness of poly(methyl methacrylate) was affected by continue exposition to chlorhexidine gluconate, antiseptic without alcohol and cola-based soft drink. The roughness of poly(methyl methacrylate) is negatively influenced by the exposure to all tested products. It may be concluded that both, microhardness and roughness, were affected by the treatments.</p></sec>

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