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1.

001-es BibID:BIBFORM044380
Első szerző:Hegedűs Csaba (fogszakorvos)
Cím:Determining the plasmonic effect in gold/acrylic polymer nanocomposites / C. Hegedus, S. Kokenyesi, J. Burunkova, L. Daroczi, M. Szaloki
Dátum:2013
ISSN:0022-0345
Megjegyzések:Objective: The application of gold nanoparticles in medicine is more intensive. The aim of our study was to investigate plasmon effect inphoto curable gold-resin based composites.Method: The gold-resin based composites are made by mixing of predispergated Au nanoparticles in toluene and photoinitiator containingmonomers mixture. The surfaces of applied gold nanopartices (AuNP; Nanoprobes) are covered by dodecanethiol. The size of Aunanopartice are about 3-5 nm. The resin matrices are prepared by the mixing of different acrylate monomers as 2-(Dimethylamino)ethylacrylate (Sigma-Aldrich, DMAEA), Urethane dimethacrylate (Sigma-Aldrich, UDMA), Bisphenol A glycerolate (Sigma-Aldrich, BisGMA), andTriethylene glycol dimethacrylate (Sigma-Aldrich, TEGDMA) in different weight ratio. The photo initiator is camphorquinone (Sigmaaldrich,C Q), the inorganic filler is silica nanoparticles (0,014 ?m, Sigma-Aldrich, SiO2 ). The Plasmon effect was investigated by opticalspectroscopy (Shimadzu 4016 UV/VIS) and the kinetic of photopolymerization was by Micro Raman spectroscopy.Result: The gold nanoparticles are dispersed in toluene. It was found that the concentration of AuNP in toluene influenced the presence ofplamon effect, indicating the aggregation of gold nanoparticles. The optical spectroscopy investigation showed that absorbance peaksappeared in gold-resin composite with silica and without silica too. This absorption justified the plasmon effect. At the photopolymerizationthere is a characteristic Raman peak of resin based composite is at 1641 cm-1. During the polymerization this peak was investigated bythe Raman spectroscopy. It is found that the rate of the polymerization decreased with increasing amount of Au nanoparticles in resinmixture. The gold nanoparticles functioned as extra absorption nodule points.C onclusion: The capped gold nanoparticles have a pasmonic effect in resin matrices. The gold nanoparticles have effect to the kinetic ofphotopolymerization process.
Tárgyszavak:Természettudományok Kémiai tudományok idézhető absztrakt
plasmonic effect
Megjelenés:Journal of Dental Research. - 92 (2013), p. 1905. -
További szerzők:Kökényesi Sándor (1946-) (fizikus) Burunkova, Julia (vegyész) Daróczi Lajos (1965-) (fizikus) Szalóki Melinda (1981-) (vegyész)
Pályázati támogatás:TÁMOP-4.2.1/B-09/1/KONV-2010-0007
TÁMOP
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2.

001-es BibID:BIBFORM044357
Első szerző:Keczánné Üveges Andrea (vegyész)
Cím:Reactive Polymer Nanoparticles for Restoration Materials in Dentistry / A. Uveges, K. Bukovinszki, M. Szaloki, C. Hegedus, J. Borbely
Dátum:2006
ISSN:0022-0345
Megjegyzések:Objective: The aim of this study was to examine the influence of modified resin usingreactive polymer nanoparticles on physical properties of filling materials such as flexuralmodulus, flexural stress and polymerization shrinkage of different composites. Methods:Model compounds applied for the resin modification were prepared from styrene (ST) andethyleneglycol dimethacrylate (EDM) by free-radical copolymerization reaction in solution.The azobis(isobutironitrile) (AIBN) initiator was applied and the reactions were carried outat 60oC . The copolymer samples were analyzed with GPC , DLS, TEM and NMR methods.The resin component of C harisma Flow Line composite was used as reference. Theflexural stress and flexural modulus analysis were done on INSTRON 4302 instrument, andthe polymerization shrinkage was analyzed by mercury dilatometer method. Results: Wehave found that molecular weight (Mw) (20-3100 kDa) and the hydrodynamic diameter(18-100 nm) increased with increasing reaction time (30-340 min). The measurement ofthe pendant double bonds showed that the concentration of the reactive groups increased(23, 41, 60 and 91%) with increasing EDM ratio in the feed (ST/EDM 90/10, 70/30, 30/70and 10/90). Both flexural modulus and flexural stress of composite increased withincreasing reactive group concentration of copolymers. The polymerization shrinkage ofmodified composite was less than that of C harisma Flow Line. C onclusions: The reactivecopolymer nanoparticles can be "co-resin" for new modified composites. Support: Thework was supported by RET (Grant of Regional University Knowledge C enter) contractnumber (RET-06/432/2004) and by ElizaNor Polymers LLC , NJ, USA.
Tárgyszavak:Természettudományok Kémiai tudományok idézhető absztrakt
restoration materilas
Megjelenés:Journal of Dental Research. - 85 (2006), p. 0299. -
További szerzők:Bukovinszky Katalin (1973-) (egyetemi tanársegéd, fogszakorvos) Szalóki Melinda (1981-) (vegyész) Hegedűs Csaba (1953-) (fogszakorvos) Borbély János (1950-) (vegyész)
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3.

001-es BibID:BIBFORM044372
Első szerző:Szalóki Melinda (vegyész)
Cím:Effect of nano-sized prepolymers to resin matrix of dental composite / M. Szaloki, J. Gall, K. Bukovinszki, J. Borbely, C. Hegedus
Dátum:2011
ISSN:0022-0345
Megjegyzések:Objectives: The knowledge on the efficiency of the organic prepolymers in the dental composites is limited. In thisstudy the influence of reactive polymeric nanoparticles (RPNPs) as nano-sized organic prepolymers on themechanical properties of different composite was examined. The aim of this study is to examine how theorganofillers influence the mechanical and rheological properties as volumetric shrinkage, compression strengthsand viscosity of the dental resin matrices. Methods: Organofillers were polymerized in two types of mole ratios(3/7 and 7/3). Two series of nanocomposites were formed by mixing two types of organofillers and Bis-GMA baseddental resin in the range of 5 and 25 w/w%. The nanoparticles were analyzed by TEM, DLS and 1H-NMR methods.The characterization of reinforced resins was performed by compression strength (Instron 4302), volumetricshrinkage (buoyancy method) and rheology (AR 550) methods. Results: The mean hydrodynamic diameter oforganofillers was in the range of 150 and 350 nm. The Mann-Whitney statistical analysis of contraction datashowed that the shrinkage was significantly decreased by increasing the volume of filler compared to the referenceresin. As a result it was found that the compression strength values (223.72?36.10 MPa) for the nanocompositesmodified with reactive polymeric nanoparticles separated significantly from reference unfilled resin (167.59?26.99MPa). C onclusion: The prepolymerized nanoparticles have remarkable effect on the rheological properties,polymerization shrinkage and compression strength. The photopolymerization shrinkage and compressionstrengths were improved significantly by adding prepolymers due to the specific structure of nanoparticles.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idézhető absztrakt
prepolymers
Megjelenés:Journal of Dental Research. - 90 : B (2011), p. 0023. -
További szerzők:Gáll József (1972-) (matematikus, közgazdász) Bukovinszky Katalin (1973-) (egyetemi tanársegéd, fogszakorvos) Borbély János (1950-) (vegyész) Hegedűs Csaba (1953-) (fogszakorvos)
Pályázati támogatás:TÁMOP 4.2.1/B-09/1/KONV-2010-0007
TÁMOP
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4.

001-es BibID:BIBFORM044365
Első szerző:Szalóki Melinda (vegyész)
Cím:Influence of polymeric nanoparticles to resin matrix of dental composites / M. Szaloki, J. Borbely, C. Hegedus
Dátum:2010
ISSN:0022-0345
Megjegyzések:Objective: An ideal dental composite is necessary to be in accordance with many requirements. In this studywas to examine the influence of reactive polymer nanoparticles (RPNPs) as nano-sized organofiller onmechanical properties of different composites. Mainly flexural modulus (FM), flexural stress (FS),polymerization shrinkage (PS) and rheology (R) properties were investigated. Nanocomposites (NC) wereconsisted of reference matrix and RPNPs in different weight%. Methods: RPNPs were prepared from mono-(M) and trifunctional (T) acrylate monomers in two types of mole ratio by water-born free-radicalcopolymerization. The copolymers were analyzed DLS, TEM and 1HNMR methods. The flexural strength ofreinforced resin matrices were analyzed by INSTRON 5544 instrument. The volumetric shrinkage wasanalyzed by buoyancy method in distilled water. The viscosities of NC were measured on AR 550 TAinstrument reometer. Results: The mean hydrodynamic diameters of RPNPs were in the range of 152?16.6nm at M:T=3:7 and in the range of 324?18.3 nm at M:TA=7:3 mole ratio. As excepted the viscosities of NCwere increased by the amount of filler. Statistical analysis of shrinkage showed that the shrinkage wassignificantly decreased (4.34?0.77 v/v %) by the increasing filler volume compared to the reference resin(6.97?0.46 v/v %). Flexural stress values were increased (114.11?11.22 MPa) compared to resin(54.8?5.8 MPa) however the flexural strength markers were weaken at higher filler volume. It can beexplained by the inhomogeneous distribution of filler in the matrix, creating of nanoclusters. Conclusion: Dueto the swelling of the RPNPS in the mixtures of dental monomers network structure thus NC had bettermechanical properties, became stiffer. The pre-polymer as RPNP reinforced resin matrices showed lowestPS and better FS values as resin matrix without it. This effect can be explained by the speciality of RPNPS.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idézhető absztrakt
resin matrix
Megjelenés:Journal of Dental Research. - 89 : B (2010), p. 138507. -
További szerzők:Borbélyné Varga Mária (1952-) (vegyész) Hegedűs Csaba (1953-) (fogszakorvos)
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5.

001-es BibID:BIBFORM044376
Első szerző:Vitályos Géza (egyetemi tanársegéd, fogszakorvos)
Cím:Binding of oligopeptide to polymethyl methacrylate surface / G. Vitalyos, M. Szaloki, J. Harsfalvi, C. Hegedus
Dátum:2012
ISSN:0022-0345
Megjegyzések:Objective: Polymers (Polymethyl methacrylate; PMMA) are one the most frequently used material in dentistry, which is often causingallergic reactions. The aim of our study was to investigate peptide structures bound to PMMA in order to deduct molecules may bind toPMMA and responsible for allergic reactions.Method: The investigated heat cured polymethyl methacrylate was Orthocryl (Dentaurum, Germany). We used phage display technologyto select peptides on PMMA surface. The phage work was carried out by linear peptide library. Ph.D.-7T M and Ph.D.-12T M Peptide LibraryKits (Biolabs, England) were based on a combinatorial library of random peptide 7-mers and random peptide 12-mers fused to a minorcoat protein of M13 Phage respectively. The phage selection was carried out five times on the PMMA surface. C olonies of the third roundsof each phage selection were used to isolate DNS for amino acid sequence determination. The binding of the selected peptides wasquantitated by ELISA and by calculation of binding constants.Result: Efficacy of the phage selections resulted in 2.33x107 phages/ml on the titer plate. At the estimation of binding affinities of theselected phages it was found that the phages bound to the surface with saturation kinetic. The amino acid sequence of the peptide insertsof selected phages showed that mostly apolar, non-aromatic amino acid occurred among them the proline is the most frequent. TheNVQTRQPEKPVL sequence gave a relative low E-value at the comparison of protein data bank.C onclusion: Oligopeptides bound to the PMMA surface and among PMMA specific phages the proline and leucine is the most oftenoccurred amino acid. The NVQTRQPEKPVL sequence may occur in that haptens or immunmediators which can be responsible for theallergic reaction.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idézhető absztrakt
dental allergy
Megjelenés:Journal of Dental Research. - 91 : B (2012), p. 3210. -
További szerzők:Szalóki Melinda (1981-) (vegyész) Hársfalvi Jolán (1949-) (klinikai biokémikus) Hegedűs Csaba (1953-) (fogszakorvos)
Pályázati támogatás:TÁMOP-4.2.1/B-09/1/KONV-2010-0007
TÁMOP
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