Effect of filler content on mechanical strength in bis-GMA-based resins with urethane linkages

Chowdhury, N. A.; Wakasa, K.; Priyawan, R.; Yamaki, M.

doi:10.1007/bf00120281

Cited by 10 publications

(1 citation statement)

References 12 publications

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“…Most commercial dental restorative materials are based on the bisphenol‐α‐glycidyl methacrylate (Bis‐GMA) monomer 8, 9. To achieve a final consistency suitable for the incorporation of particulate fillers as well as to increase the degree of conversion, a low molecular weight methacrylate diluent is added to the highly viscose Bis‐GMA monomer.…”

Section: Introductionmentioning

confidence: 99%

Dental composites reinforced with hydroxyapatite: Mechanical behavior and absorption/elution characteristics

Domingo

Arcís

López‐Macipe³

et al. 2001

J. Biomed. Mater. Res.

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The purpose of this study was to analyze the behavior in water as well as the mechanical and surface properties of experimental composites designed for dental restoration. Studied materials were composed of a visible-light-cured monomer mixture as a matrix (bisphenol-alpha-glycidyl methacrylate with triethyleneglycol dimethacrylate or hydroxyethyl methacrylate) and either micrometric or nanometric hydroxyapatite (HA) particles as a reinforcing filler. The surface of the filler particles was modified by using different coupling agents (citric, hydroxysuccinic, acrylic, or methacrylic acid). The hydrolytic stability of the evaluated materials was studied through elution-in-water and water-uptake tests. Mechanical and surface properties were examined through the results of flexural, hardness, and surface roughness tests. Means and standard deviations were calculated for each variable. Analysis of variance and multiple comparison tests were performed. Materials containing bisphenol-alpha-glycidyl methacrylate:triethyleneglycol dimethacrylate and micrometric-HA coated with citrate, acrylate, or methacrylate displayed the most favorable results. Improvements should be obtained by increasing the total filler amount, and by the introduction of nanometric-HA filler into a micrometric-HA reinforced composite resin system.

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Section: Introductionmentioning

confidence: 99%

Dental composites reinforced with hydroxyapatite: Mechanical behavior and absorption/elution characteristics

Domingo

Arcís

López‐Macipe³

et al. 2001

J. Biomed. Mater. Res.

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Understanding the kinetics and network formation of dimethacrylate dental resins

Lovell¹,

Berchtold²,

Elliott³

et al. 2001

Polymers for Advanced Techs

201

188

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Dimethacrylate monomers are commonly used as the organic phase of dental restorative materials but many questions remain about the underlying kinetics and network formation in these highly crosslinked photopolymer systems. Several novel experimental and modeling techniques that have been developed for other multifunctional (meth)acrylates were utilized to gain further insight into these resin systems. Specifically, this work investigates the copolymerization behavior of bis-GMA (2,2-bis[p-(2-hydroxy-3-methacryloxyprop-1oxy)-phenyl]propane) and TEGDMA (triethylene glycol dimethacrylate), two monomers typically used for dental resin formulations. Near-infrared spectroscopy, electron paramagnetic resonance spectroscopy, as well as dynamic mechanical and dielectric analysis were used to characterize the kinetics, radical populations, and structural properties of this copolymer system. In addition, a kinetic model is described that provides valuable information about the network evolution during the formation of this crosslinked polymer. The results of these numerous studies illustrate that all of the aforementioned techniques can be readily applied to dental resin systems and consequently can be used to obtain a wealth of information about these systems. The application of these techniques provides insight into the complex polymerization kinetics and corresponding network formation, and as a result, a more complete understanding of the anomolous behaviors exhibited by these systems, such as diffusion controlled kinetics and conversion dependent network formation, is attained.

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Degree of conversion and mechanical properties studies of UDMA based materials for producing dental posts

Zheng

2008

Polymer Composites

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Nanocomposites are a relatively new material in producing fiber re‐enforced dental posts. The mechanical properties of nanocomposites, which strongly associate with the resin matrix, nanoparticles, and the interface between inorganic fillers and organic matrix, play an important role in determining the quality of dental posts. This work was to investigate the effect of degree of conversion (DC) and silanization of fillers on the mechanical properties of nanocomposties. Experimental Urethane dimethacrylate (UDMA) based dental composites containing unsilanized and silanized SiO2 filler and various amount of triethylene glycol dimethacrylate (TEGDMA) were prepared at the first step. The DC of composites at different ratios of UDMA/TEGDMA, cure temperature and cure time was measured by Fourier transform infrared spectroscopy. The results showed that DC increases with the increase of TEGDMA content in resin matrix. Both increase of the cure temperature and cure time can cause the increase of DC. The incorporation of fillers, either silanized, or unsilanized filler, caused the decrease of DC. However, composites reinforced with silanized silica showed relatively lower DC, and DC decreased with the increase of silanized filler content. The effect of incorporation of fillers on the mechanical properties was investigated. Silanized silica can effectively improved the flexural strength and flexural modulus of material, and these properties increased with the increase of silica content. Thermomechanical analysis (DMA) provided the similar results to the static property measurements. SEM images of fracture surfaces of specimens from flexural testing revealed the surface morphology is strongly related to the quality of interface between inorganic fillers and organic matrix. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers

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Effect of filler content on mechanical strength in bis-GMA-based resins with urethane linkages

Cited by 10 publications

References 12 publications

Dental composites reinforced with hydroxyapatite: Mechanical behavior and absorption/elution characteristics

Dental composites reinforced with hydroxyapatite: Mechanical behavior and absorption/elution characteristics

Understanding the kinetics and network formation of dimethacrylate dental resins

Degree of conversion and mechanical properties studies of UDMA based materials for producing dental posts

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