Effects of Molecular Structure of the Resins on the Volumetric Shrinkage and the Mechanical Strength of Dental Restorative Composites

Lu, Kim; Jw, Kim; Ck, Kim

doi:10.1021/bm060453h

Cited by 34 publications

(35 citation statements)

References 24 publications

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“…[1] The formation of a polymer network with a denser structure than the monomer, results in volumetric contraction or shrinkage. Shrinkage is the result in the change of the van der Waals distances (3.4 Å) between the molecules of the monomer, to covalent bond lengths in the polymer (1.54 Å).…”

Section: Introductionmentioning

confidence: 99%

The effect of a dithiol spiroorthocarbonate on mechanical properties and shrinkage of a dental resin

Ortiz

Gómez

Duarte

et al. 2014

Designed Monomers and Polymers

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A novel spiroorthocarbonate with two thiol groups (SOC DITHIOL) was synthesized. This monomer was formulated with dimethacrylate monomers used in dental resins and photopolymerized with an LED dental lamp. The presence of the thiol groups in the monomer enabled it to react with the double bonds of the dimethacrylate monomers by means of the thiol-ene mechanism. Additionally, the SOC DITHIOL underwent cationic ring-opening polymerization, producing the corresponding poly(ether-carbonates). SOC DITHIOL was added to a formulation of a conventional acrylic resin, which includes a mixture of dimethacrylate monomers [glycerolate bisphenol A dimethacrylate (BIS-GMA)/ urethane dimethacrylate (UDMA)/triethyleneglycol dimethacrylate (TEGDMA)] in 50/30/20 M ratio). Concentration of the prepared SOC was varied in the above dimethacrylate formulation in the range of 5-30 mol%. Kinetics of photopolymerization were determined by means of real time Fourier transform infrared spectroscopy, finding that increasing concentrations of the SOC DITHIOL in the formulations, not only did not affect the photopolymerization rate of the acrylic resins, but it helped to increase the final conversion of the methacrylate groups. It was also found that the presence of SOC DITHIOL increased the elastic modulus of the resulting cross-linked polymer. The addition of 30% of SOC DITHIOL reduced shrinkage 59% in comparison with a sample without the SOC.

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Section: Introductionmentioning

confidence: 99%

The effect of a dithiol spiroorthocarbonate on mechanical properties and shrinkage of a dental resin

Ortiz

Gómez

Duarte

et al. 2014

Designed Monomers and Polymers

View full text Add to dashboard Cite

show abstract

“…Studying about the derivatives of Bis-GMA is another way to reduce polymerization shrinkage. Examples include the use of a methyl group to replace hydrogen on the benzene ring of Bis-GMA or the use of a glycidyl methacrylate as the terminal group 4) . However, these modified monomers still have the unsatisfactory polymerization shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a liquid-crystalline resin monomer with the property of low shrinkage polymerization

Liu

et al. 2013

Dent. Mater. J.

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To reduce the polymerization shrinkage of the dental resin composites, a new liquid-crystalline resin monomer was developed. The acrylate liquid crystalline resin monomer (ALCRM), (4-3-(acryloyloxy)-2-hydroxypropoxy) phenyl 4-(3-(acryloyloxy)-2-hydroxypropoxy) benzoate, was synthesized by a three-step method. Using the ALCRM as the main monomer, the degree of conversion (DC) and the volume shrinkage of the resin matrix were compared with the traditional composite resin monomer (Bis-GMA), 2,2-bis[4-(2-hydroxy-3-methacryloyloxy-propoxy)-phenyl] propane. The new monomer showed liquid crystalline characteristics with a mesomorphic phasetransition temperature between 18ºC and 42ºC. When copolymerized with triethylene glycol dimethacrylate (TEGDMA) at a weight ratio of 7:3, the DC of ALCRM was higher and the volume shrinkage was 3.62±0.26%, which was less than that of the Bis-GMA. The ALCRM exhibits promising potential for the development of superior dental resins with low volume shrinkage.

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“…2 Scientists have developed some matrices with lower polymerization shrinkage. [3][4][5][6] Compared with the traditional acrylic resin, liquid crystal polymers (LCPs) have become the focus for their unique structures and mechanical properties. Researchers at the University of Texas Health Science Center developed a new kind of liquid crystalline matrix with remarkably low polymerization shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the mechanical properties of a low-shrinkage liquid crystalline matrix combined with nano-hydroxyapatite

Liu

Xiao²,

Mo³

et al. 2011

IJN

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The objective of this study was to investigate the mechanical properties of a low-shrinkage acrylate liquid crystalline resin matrix (ALCRM), (4-3-(acryloyloxy)-2-hydroxypropoxy) phenyl 4-(3-(acryloyloxy)-2-hydroxypropoxy) benzoate, combined with nano-hydroxyapatite (na-HA). The ALCRM monomer and diluent monomer triethylene glycol dimethacrylate (TEGDMA) were mixed at a mass ratio of 7:3 to prepare the resin matrix. The volume shrinkage of the ALCRM/TEGDMA and the traditional resin matrix Bis-GMA (2, 2-bis [4-(3-methacryloxy-2-hydroxypropoxy) phenyl] propane)/TEGDMA were measured. Then 20%, 30%, and 40% na-HA were added to ALCRM/TEGDMA and Bis-GMA/TEGDMA, respectively. Compressive strength (CS) and Vickers hardness (VHN) were tested to identify mechanical properties of the composites. The volume shrinkage of the ALCRM/TEGDMA was 3.60% ± 0.36%, which was lower than that of the traditional resin matrix. Moreover, with the same amount of na-HA filler, the mechanical properties of the ALCRM-based composites were superior to those of Bis-GMA-based composites. ALCRM-based composites exhibited the highest CS and VHN values when the filler content was 30%. These results indicate that the low-shrinkage liquid crystalline resin matrix has strong mechanical properties after incorporating the na-HA. The experimental ALCRM-based composites have promising potential for the development of novel low-shrinkage dental resins with strong mechanical properties.

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Effects of Molecular Structure of the Resins on the Volumetric Shrinkage and the Mechanical Strength of Dental Restorative Composites

Cited by 34 publications

References 24 publications

The effect of a dithiol spiroorthocarbonate on mechanical properties and shrinkage of a dental resin

The effect of a dithiol spiroorthocarbonate on mechanical properties and shrinkage of a dental resin

Synthesis of a liquid-crystalline resin monomer with the property of low shrinkage polymerization

Investigation of the mechanical properties of a low-shrinkage liquid crystalline matrix combined with nano-hydroxyapatite

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