Relationship between composite matrix molecular structure and properties

Davy, K. W. M.; Kalachandra, S.; Pandain, M.S.; Braden, M.

doi:10.1016/s0142-9612(98)00047-7

Cited by 53 publications

(48 citation statements)

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“…This occurs because the hydroxyl groups are positioned diametrically across the rigid bisphenol core structure of the molecule, making them unable to interact and resulting in an intermolecular hydrogen bonding 31 . A significant reduction in intermolecular hydrogen bonding can be obtained with some derivatives of BisGMA, such as the BisEMA monomer, which is a non-hydroxylated homologous monomer of BisGMA 1 .…”

Section: Resultsmentioning

confidence: 99%

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Degree of conversion of Z250 composite determined by fourier transform infrared spectroscopy: comparison of techniques, storage periods and photo-activation methods

Obici

Sinhoreti

Frollini³

et al. 2004

Mat. Res.

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The purpose of this study was to evaluate the degree of conversion (DC) of the Z250 composite, using six photo-activation methods, two storage periods and two preparation techniques of the FTIR specimens (n = 3). For the KBr pellet technique, the composite was placed into a metallic mold and photo-activated as follows: continuous light, exponential light, intermittent light, stepped light, PAC and LED. The measurements were made after 24 h and 20 days. For the resin film technique, approximately 0.07 g of the composite was pressed between two polyester strips, photoactivated as above described and analyzed. The DC was calculated by the standard technique and submitted to ANOVA and Tukey's test (α = 5%). Independently of the storage period and specimen preparation technique, there were no significant differences among photo-activation methods. No statistical difference was observed between the time periods used. The specimens analyzed under the KBr pellet technique presented higher DC values than those analyzed by the resin film technique.

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Section: Resultsmentioning

confidence: 99%

“…These monomers have molecular weights similar to that of BisGMA, but are less viscous due to a greater flexibility of the urethane linkage 1 . The viscosity of the UDMA monomer is 23.1 Pas at 20 °C 31 . BisGMA, BisEMA and UDMA compose the organic matrix of the Z250 composite resin used in this study.…”

Section: Resultsmentioning

confidence: 99%

Degree of conversion of Z250 composite determined by fourier transform infrared spectroscopy: comparison of techniques, storage periods and photo-activation methods

Obici

Sinhoreti

Frollini³

et al. 2004

Mat. Res.

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“…Many approaches have been developed to improve these properties. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Dental monomers are generally liquids cured by a photoinitiating system based on combination of camphorquinone and tert-amine derivatives.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Photopolymerizations of New Crosslinkers for Dental Applications

Yağcı

Ayfer²,

Albayrak

et al. 2006

Macro Materials & Eng

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Summary: Five new crosslinkers for use in dental composites were synthesized. Four are based on TBHMA: 1 via reaction of TBBr and Bisphenol A; 2 by hydrolysis of t‐butyl groups of the first monomer to give a diacid derivative; 3 by conversion of the first monomer to an amide derivative using benzyl amine; 4 by conversion of the first monomer to amide derivative using APTES. The AHM‐based monomer 5 was synthesized from the Michael addition of APTES to AHM. The photopolymerization behaviors of the synthesized monomers with Bis‐GMA, TEGDMA and HEMA were investigated using photodifferential scanning calorimetry at 40 °C using DMPA as photoinitiator. The polymerization rates and degrees of conversion for mixtures of any of the monomers 1–4 with Bis‐GMA:TEGDMA were found to be similar to Bis‐GMA:TEGDMA, higher than Bis‐GMA:HEMA, and also higher than mixtures with Bis‐GMA:HEMA. The incorporation of TBHMA‐based monomers into the conventional resin mixture (Bis‐GMA and TEGDMA) reduced the polymerization shrinkages. Monomer 5 and its mixtures polymerized much faster and to higher degrees of conversion than the other investigated systems, however, this system exhibited the largest volume shrinkage.Structures of some of the new crosslinkers synthesized.magnified imageStructures of some of the new crosslinkers synthesized.

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“…, limita o seu manuseio, grau de conversão e a incorporação de partículas inorgânicas e, por esse motivo, deve ser diluído com monômeros dimetacrilatos fluidos 12 .…”

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“…No entanto, enquanto a incorporação do TEGDMA ao Bis-GMA leva a diminuição da viscosidade e ao aumento do grau de conversão, sua adição acarreta também em uma série de desvantagens ao sistema como: 1) aumento da contração de polimerização, cujo estresse pode resultar na formação de fendas entre a estrutura dental e a restauração e, por conseqüência, acentuada infiltração marginal 12 ; 2) aumento da sorpção de água pelo polímero levando a alterações em suas propriedades mecânicas 41 26,60 . A substituição das hidroxilas pendentes reduziu significativamente a viscosidade e sorpção de água desses monômeros 26,60 .…”

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Influência de aditivos nas propriedades de comonômeros, copolímeros e compósitos a base de Bis-GMA, diluído com TEGDMA ou análogos sintetizados do Bis-GMA (CH3Bis-GMA e CF3Bis-GMA)

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Relationship between composite matrix molecular structure and properties

Cited by 53 publications

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Degree of conversion of Z250 composite determined by fourier transform infrared spectroscopy: comparison of techniques, storage periods and photo-activation methods

Degree of conversion of Z250 composite determined by fourier transform infrared spectroscopy: comparison of techniques, storage periods and photo-activation methods

Synthesis and Photopolymerizations of New Crosslinkers for Dental Applications

Influência de aditivos nas propriedades de comonômeros, copolímeros e compósitos a base de Bis-GMA, diluído com TEGDMA ou análogos sintetizados do Bis-GMA (CH3Bis-GMA e CF3Bis-GMA)

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