Posts Tagged ‘UDMA’
Monday, June 10th, 2013
Synonyms
Item Code: X-850-0000
Product Name: Urethane Dimethacrylate, UDMA, DUDMA, diurethane dimethacrylate
INCI: Di-HEMA Trimethylhexyl Dicarbamate
Our Urethane Dimethacrylate is a mix of isomers and is often used in light-cure systems. As a homopolymer, UDMA cures to form a hard, glassy surface that is low in color and bisphenol A free! Various urethane dimethacrylates have been used in anaerobic adhesive applications. This material has also been referred to as diurethane dimethacrylate, DUDMA as well as Di-HEMA Trimethylhexyl Dicarbamate.
Performance Properties:
- Fast curing
- Low color
- Customizable to meet your application
Typical Applications:
- Light-curable, Dental Composite Base Resin
- Predominant resin in UV-curable nail gels
- Component in Anaerobic Adhesives
- Energy-curable coatings
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Tags: anaerobic adhesive, base resin, coating, core resin, dental composite, Di-HEMA Trimethylhexyl Dicarbamate, dimethacrylate, diurethane dimethacrylate, DUDMA, light cure, low color, nail gel, UDMA, urethane dimethacrylate, X-850-0000
Posted in White Papers | Comments Off on PRODUCT SPOTLIGHT: Urethane Dimethacrylate
Thursday, October 13th, 2011
Characterization of a nanoparticle-filled resin for application in scan-LED-technology
Eva Kolb, Claudia Kummerlöwe and Martin Klare
Abstract
Scan-LED-technology is a new rapid prototyping technique with increasing applications in the production of custom-made medical products. The present work is dealing with the examination of a silica/
urethandimethacrylate (UDMA) nanocomposite for application in scan-LED-technology. The use of specific LED in a photo-DSC unit enables the simulation of crucial parameters of nanoparticle-filled resins for their application in scan-LED-technology. The conversion of double bonds during the curing reaction and the rate of conversion were studied as a function of radiation intensity, silica nanoparticle content, and silanization of the nanoparticles with 3-methacryloyloxypropyl-trimethoxysilane (MPTMS). The conversion of double bonds is increasing with increasing radiation intensity. The increasing conversion of the nanoparticle-filled resins is discussed as a combined effect of increasing nanoparticle content, alternated initiator/double bond ratio and increasing radiation intensity. A significant dependence of the reaction rate on nanoparticle content could not be found. Only for the unfilled resin, the rate was increasing at higher radiation intensities. The influence of residual solvent on conversion and rate of reaction was also analyzed. TGA measurements combined with FTIR were used to study the silanization of the nanoparticles. The silane layer thickness on the surface of the silica nanoparticles was determined.
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Tags: esstech, lithography, nanocomposite, rapid prototyping, UDMA, urethane, X-850-0000
Posted in Research Paper | Comments Off on Urethane Dimethacrylate used in Rapid Prototyping Application
Tuesday, March 29th, 2011
Synthesis of Nanosilica Fillers for Experimental Dental Nanocomposites and Their Characterisations
Tuan Noraihan Azila Tuan Rahim1, Dasmawati Mohamad1*, Abdul Rashid Ismail1 and Hazizan Md Akil2
1School of Dental Sciences, Universiti Sains Malaysia,
2School of Material and Mineral Resources Engineering, Universiti Sains Malaysia
MATERIALS:
Tetraethyorthosilicate (TEOS), absolute ethanol, ammonia, γ-methacryloxypropyl-trimethoxysilane (γ-MPS), acetic acid (CH3COOH), bisphenol A glycidyl methacrylate (BisGMA, Esstech), diurethane dimethacrylate (UDMA), triethylene glycol dimethacrylate (TEGDMA), camphorquinone (CQ), (2-dimethylaminoethyl) methacrylate (DMAEMA) and distilled water were used in this work. The chemicals were employed without any further purification.
ABSTRACT:
The aim of this study was to synthesise nanosilica fillers for use in the fabrication of experimental dental nanocomposites and to evaluate their properties, including surface and mechanical properties. Monodispersed, spherical silica nanoparticles were synthesised via a sol-gel process, and a size range of 10–20 nm was obtained. Surface treatment of the nanosilica was carried out with the silane coupling agent γ-methacryloxypropyltrimethoxysilane (MPS) to reduce agglomeration of nanosilica. Experimental dental nanocomposites with two different filler contents, 30 and 35 wt%, were fabricated and polymerised with a light curing unit for 40 s. The surface morphology, surface roughness, flexural strength and elastic modulus were evaluated and compared. A nanocomposite with 35% filler content showed higher filler compaction, lower surface roughness and higher elastic modulus than a nanocomposite filled with 30% filler. However, the nanocomposite filled with 30% filler content showed higher flexural strength. Based on the results obtained, the synthesised nanosilica is a promising material for the fabrication of dental nanocomposites for tooth-filling applications.
LINK: http://web.usm.my/jps/22-1-11/22.1.6.pdf
Journal of Physical Science, Vol. 22(1), 93–105, 2011
© Penerbit Universiti Sains Malaysia, 2011
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Tags: bis-GMA, bisGMA, camphorquinone, composite, CQ, dental research, esstech, TEGDMA, UDMA, urethane, X-801-0000, X-850-0000, X-943-7446
Posted in Research Paper | Comments Off on BisGMA – UDMA Composite with Nanosilica Fibers
Monday, February 28th, 2011
Hydrogen bonding interactions in methacrylate monomers and polymers
Marianela T. Lemon, Melissa S. Jones, Jeffrey W. Stansbury
Department of Craniofacial Biology, University of Colorado School of Dentistry, Aurora, Colorado 80045
ABSTRACT
It is well appreciated that hydrogen bonding affects a variety of monomer and polymer properties. This study focused on Bis-GMA and urethane dimethacrylate (UDMA) to help elucidate how the strength and nature of
specific noncovalent interactions involved with these different functional dimethacrylate structures are expressed in the monomers and polymers. Hydrogen bonding interactions in monomers and comonomer mixtures as well as in appropriate model compounds were examined by FT-IR under ambient conditions, at elevated temperatures and in dilution studies. The investigation of hydrogen bonding extended to monomer viscosity, photopolymerization reaction kinetics, and polymer mechanical properties.
CONCLUSION
The strength of hydrogen bonding was shown not only to be greater for Bis-GMA compared with UDMA, but there is also greater contribution from intermolecular interactions that enhance the hydrogen bonding effects. While UDMA-based polymers reach significantly higher levels of conversion compared with Bis-GMA materials, the stronger hydrogen bonding reinforcement associated with Bis-GMA appears to provide for comparable mechanical strength properties. Depending on the hydrogen bond donor functionality of a monomer as well as its neighboring functional groups, overall monomer structure and comonomers used, hydrogen bonding can favorably affect polymerization reactivity and mechanical properties, even in materials that form highly crosslinked polymeric networks.
Wiley Periodicals, Inc. J Biomed Mater Res 83A: 734–746,2007
Link: http://onlinelibrary.wiley.com/doi/10.1002/jbm.a.31448/abstract
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Tags: bis-GMA, bisGMA, dental research, Monomer, UDMA, urethane, X-850-0000, X-950-0000
Posted in Research Paper | Comments Off on Properties of UDMA and Bis-GMA based Composites
Friday, September 10th, 2010
Effects of adhesive, base and diluent monomers on water sorption and conversion of experimental resins
Sabine H. Dickens, Glenn M. Flaim, Cynthia J.E. Floyd
Dental Materials Volume 26, Issue 7, Pages 675-681 (July 2010)
Objectives: To establish the relationship of resin composition and resin hydrophilicity (indicated by solubility parameters and logP) to water sorption (WS), solubility, and degree of double bond conversion (DC) of resin mixtures designed for adhesive restoratives by varying the concentration of pyromellitic glycerol dimethacrylate (PMGDM) and various co-monomers.
Methods: Sixteen resin mixtures were prepared with (30–70) mass fraction % PMGDM. At given PMGDM concentrations there were up to five compositions with increasing logP. Polymer disks (13mm×0.7mm) were exposed to 96% relative humidity (RH) to determine water sorption in humid atmosphere (WSH) and subsequently immersed in water for immersion water sorption (WSI) and solubility. DC was assessed by near infrared spectroscopy.
Results: WSI was somewhat higher than WSH, which ranged from (2.1 to 5.3) mass fraction %. Both data were positively correlated to PMGDM concentrations [Pearson correlation, p<0.02; R2=0.74, 0.73 (WSI)] and solubility (R2=0.64), but not to logP. When grouped by structural similarities, i.e., base resins with bisphenol A core (Group B), Group O containing diluent monomers, or Group U containing urethane dimethacrylate, WS within each group was inversely correlated to logP with R2=0.98, 0.81, 0.95, and WS/solubility correlation improved with R2=0.88, 0.92 and 0.75, respectively. Solubility ranging from 0.3% to 2.3% was inversely related to DC (r=−0.872). Conversion ranging from 41% to 81% was lower for resins with high base monomer concentrations and highest in mixtures with UDMA.
Significance: LogP was a good predictor of WS after grouping the resins according to functional, compositional and structural similarities. WS and conversion were reasonably well predicted from Hoy’s solubility parameters and other physical resin properties.
Link: http://www.demajournal.com/article/S0109-5641%2810%2900066-7/abstract
Tags: Adhesive Monomer, bis-GMA, bisEMA, bisGMA, EBPADMA, PMGDM, Remineralization, TEGDMA, UDMA, X-830-0050, X-850-0000, X-943-7446, X-950-0000, X-970-0000
Posted in Research Paper | Comments Off on PMGDM / UDMA Used in Remineralization Applications
Thursday, June 17th, 2010
Controlled Release of Chlorhexidine from UDMA-TEGDMA Resin
K.J. Anusavice, N.-Z. Zhang and C. Shen
J DENT RES 2006; 85; 950
ABSTRACT
Chlorhexidine salts are available in various formulations for dental applications. This study tested the hypothesis that the release of chlorhexidine from a urethane dimethacrylate and triethylene glycol dimethacrylate resin system can be effectively controlled by the chlorhexidine diacetate content and pH. The filler concentrations were 9.1, 23.1, or 33.3 wt%, and the filled resins were exposed to pH 4 and pH 6 acetate buffers. The results showed that Fickian diffusion was the dominant release mechanism. The rates of release were significantly higher in pH 4 buffer, which was attributed to the increase of chlorhexidine diacetate solubility at lower pH. The higher level of filler loading reduced the degree of polymerization, leading to a greater loss of organic components and higher chlorhexidine release rates.
Link: http://jdr.sagepub.com/cgi/content/abstract/85/10/950
Tags: composite, dental research, dimethacrylate, esstech, Resin, TEGDMA, Triethyleneglycol, UDMA, urethane, X-850-0000, X-943-7446
Posted in Research Paper | Comments Off on UDMA – TEGDMA Viable Resin System for Chlorhexidine Release
Wednesday, June 2nd, 2010
BisGMA, bisphenol A-glycidyl methacrylate is a common resin that carries trace amounts of BPA. Bisphenol A (BPA) carries with it various risks recognized by the National Toxicology Program.
It is possible that high doses of bisphenol A during pregnancy and/or lactation can reduce survival, birth weight, and growth of offspring early in life. BPA has also been shown to have estrogenic effects. *
According to internal analysis, Esstech’s bisGMA, Product Code X-950-0000, has one of the lowest BPA concentrations in the industry.
EASE OF FORMULATION
To simplify formulations, X-950-0000 is available in pre-mixed solutions with Triethyleneglycol Dimethacrylate (TEGDMA).
BPA-FREE ALTERNATIVES
Esstech is constantly striving to provide customers with the most up-to-date and novel materials. The f0llowing are resin “alternatives” that do not contain BPA.
X-850-0000, Urethane Dimethacrylate
- Cures to create a hard glassy surface
- Low color values
- Excellent compatibility with light cure systems
X-726-0000, Extended UDMA
- Increased flexibility
- Enhanced fracture toughness
Esstech is constantly striving to provide customers with the most up-to-date and novel materials. Contact us if you would like to discuss a certain material or to hear what we have in development.
* NTP-CERHR Monograph on the Potential Human Reproductive and Developmental Effects of Bisphenol A. National Toxicology Program, U.S. Department of Health and Human Services. NIH Publication No. 08-5994, September 2008.
Tags: bis-GMA, bisGMA, bisphenol A, BPA, Extended, TEGDMA, UDMA, urethane, X-726-0000, X-850-0000, X-950-0000, X-951-0050, X-951-0080
Posted in White Papers | Comments Off on Bisphenol A Content
Friday, May 21st, 2010
Bis-GMA co-polymerizations: Influence on conversion, flexural properties, fracture toughness and susceptibility to ethanol degradation of experimental composites
Carmem S. Pfeifer, Laura R. Silva, Yoshio Kawano, Roberto R. Braga
Dental Materials Volume 25, Issue 9, Pages 1136-1141 (September 2009)
Objectives
The aim of this study was to evaluate the influence of monomer content on fracture toughness (KIc) before and after ethanol solution storage, flexural properties and degree of conversion (DC) of bisphenol A glycidyl methacrylate (Bis-GMA) co-polymers.
Results
The 30B:70T composite presented the highest KIc value (in MPa
m1/2) at 24h (1.3±0.4), statistically similar to 30B:35T:35U and 30B:70U, while 30B:70E presented the lowest value (0.5±0.1). After ethanol storage, reductions in KIc ranged from 33 to 72%. The 30B:70E material presented the lowest reduction in FT and 30B:70U, the highest. DC was similar among groups (69–73%), except for 30B:70U (52±4%, p<0.001). 30B:70U and 30B:35T:35U presented the highest FS (125±21 and 122±14MPa, respectively), statistically different from 30B:70T or 30B:70E (92±20 and 94±16MPa, respectively). Composites containing UDMA or Bis-EMA associated with Bis-GMA presented similar FM, statistically lower than 30B:35T:35U.
Tags: bis-EMA, bis-GMA, bisEMA, bisGMA, composite, conversion, dental research, esstech, mechanical properties, TEGDMA, UDMA, urethane, X-850-0000, X-943-7446, X-950-0000, X-970-0000
Posted in Research Paper | Comments Off on BisGMA:TEGDMA:UDMA Composites Present Optimal Conversion and Mechanical Properties.
Wednesday, March 31st, 2010
Polymerization Shrinkage and Stress Development in Amorphous Calcium Phosphate/Urethane Dimethacrylate Polymeric Composites
J.M. Antonucci, W.F. Regnault, and D. Skrtic
Journal of Composite Materials, Feb 2010; vol. 44: pp. 355 – 367. DOI: 10.1177/0021998309345180
Abstract: This study explores how substituting a new high molecular mass oligomeric poly(ethylene glycol) extended urethane dimethacrylate (UDMA) (PEG-U) for 2-hydroxyethyl methacrylate (HEMA) in photo-activated UDMA resins affects degree of vinyl conversion (DC), polymerization shrinkage (PS), stress development (PSSD) and biaxial flexure strength (BFS) of their amorphous calcium phosphate (ACP) composites. The composites were prepared from four types of resins (UDMA, PEG-U, UDMA/HEMA, and UDMA/PEG-U) and zirconia-hybridized ACP. Introducing PEG-U improved DC, while not adversely affecting PS, PSSD, and the BFS of composites. This improvement in DC is attributed to the long, more flexible structure between the vinyl groups of PEG-U and its higher molecular mass compared to poly(HEMA). The results imply that PEG-U has the potential to serve as an alternative to HEMA in dental and other biomedical applications.
…material research program supported by FDA, NIST, and ADAF. Generous contribution of UDMA, PEG- U, and HEMA monomers from Esstech, Essington, PA, USA, is gratefully acknowledged. Polymerization Shrinkage and Stress in ACP Composites 365 The authors also…
This version was published on February 1, 2010
Link: http://jcm.sagepub.com/cgi/content/abstract/44/3/355
Tags: composite, dimethacrylate, Extended, HEMA, polymerization, Shrinkage, stress, UDMA, urethane, X-726-0000, X-850-0000, X-968-7044
Posted in Research Paper | Comments Off on X-726-0000 Serves as HEMA Alternative and Improves Degree of Conversion
Thursday, March 18th, 2010
Photobleaching of camphorquinone during polymerization of dimethacrylate-based resins
Silvana Asmusen, Gustavo Arenas, Wayne D. Cook, Claudia Vallo
Dental Materials, December 2009 (Vol. 25, Issue 12, Pages 1603-1611)
Abstract: Objective: The aim of this study was to compare the photobleaching rate of CQ in different dental resins. Methods: The photodecomposition rate of CQ/amine system in bis-GMA/TEGDMA, bis-EMA and UDMA polymerizing monomers was evaluated at different light intensities. The photobleaching of the CQ was studied by monitoring the decrease in light absorption as a function of continuous irradiation time. The absorption changes were assessed by recording the transmitted light that passed through samples of monomers containing CQ/amine. Results: Complete photobleaching of CQ was observed in all the monomer tested and the rate constant for the photobleaching was proportional to the radiation intensity. Hydrogen abstraction from amines by the excited CQ state via electron transfer and direct hydrogen abstraction from monomer structures were involved in the CQ photoreduction. CQ was photobleached in the absence of coinitiator in a dimethacrylate monomer containing a carbamate functional group (UDMA). This behavior was attributed to the presence of labile hydrogen atoms in the UDMA monomer. The CQ photobleaching rate constant in UDMA containing CQ/amine was similar to that in UDMA in the absence of amine. Moreover, the efficiency of CQ to photoinitiate the polymerization of UDMA in the absence of amine demonstrated that the radicals derived from the UDMA monomer via hydrogen abstraction are highly reactive toward double bonds.
Significance: CQ photoinitiates the polymerization of the UDMA monomer in the absence of amine and the efficiency of this process is comparable to that of traditional bis-GMA and bis-EMA monomers activated with CQ/amine.
Link: http://www.demajournal.com/article/S0109-5641(09)00285-1/abstract
Tags: amine, bis-EMA, bis-GMA, bisEMA, bisGMA, camphorquinone, composite, CQ, dimethacrylate, photobleaching, TEGDMA, UDMA, urethane, X-801-0000, X-850-0000, X-943-7446, X-950-0000, X-970-0000
Posted in Research Paper | Comments Off on Camphorquinone Decomposition Rates Vary Among UDMA and BisGMA/TEGDMA Formulations
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