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Acrylic Resins

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R.d. Hoffman – One of the best experts on this subject based on the ideXlab platform.

  • Interactions of water with unsaturated polyester, vinyl ester and Acrylic Resins
    Polymer, 1992
    Co-Authors: Sang-baek Lee, T.j. Rockett, R.d. Hoffman
    Abstract:

    Abstract Moisture diffdiffusion in unsaturated polyester, vinyl ester and Acrylic Resins exposed to various relative humidities and temperatures was investigated. The effects on water uptake of the type and amount of initiator, the post-curing treatment and specimen thickness were evaluated. A weight loss during exposure was observed in some Resins; the true equilibrium water content and the diffusion coefficient could not be determined for these polymers. Absorption-desorption-reabsorption (ADR) experiments were conducted to determine the true equilibrium water contents and diffusion coefficients. These ADR experiments also show whether a resin exhibits a continuous weight loss during long term water exposure, a phenomenon associated with degradation of the polymer network, or whether the loss is caused only by the release of residual species. The water diffusion behaviour for polymers containing disc cracks was compared with the behaviour of polymers without disc cracks. Diffusion coefficients and saturation values are given for orthophthalic polyesters, isophthalic polyesters, vinyl ester and Acrylic Resins at 65°C and a 75% relative humidity.

Sang-baek Lee – One of the best experts on this subject based on the ideXlab platform.

  • Interactions of water with unsaturated polyester, vinyl ester and Acrylic Resins
    Polymer, 1992
    Co-Authors: Sang-baek Lee, T.j. Rockett, R.d. Hoffman
    Abstract:

    Abstract Moisture diffusion in unsaturated polyester, vinyl ester and Acrylic Resins exposed to various relative humidities and temperatures was investigated. The effects on water uptake of the type and amount of initiator, the post-curing treatment and specimen thickness were evaluated. A weight loss during exposure was observed in some Resins; the true equilibrium water content and the diffusion coefficient could not be determined for these polymers. Absorption-desorption-reabsorption (ADR) experiments were conducted to determine the true equilibrium water contents and diffusion coefficients. These ADR experiments also show whether a resin exhibits a continuous weight loss during long term water exposure, a phenomenon associated with degradation of the polymer network, or whether the loss is caused only by the release of residual species. The water diffusion behaviour for polymers containing disc cracks was compared with the behaviour of polymers without disc cracks. Diffusion coefficients and saturation values are given for orthophthalic polyesters, isophthalic polyesters, vinyl ester and Acrylic Resins at 65°C and a 75% relative humidity.

Cengiz Uzun – One of the best experts on this subject based on the ideXlab platform.

  • the evaluation of water sorption solubility on various Acrylic Resins
    European Journal of Dentistry, 2008
    Co-Authors: Suleyman Hakan Tuna, Filiz Keyf, Hasan Onder Gumus, Cengiz Uzun
    Abstract:

    OBJECTIVES The absorption of water by Acrylic Resins is a phenomenon of considerable importance since it is accompanied by dimensional changes, a further undesirable effect of absorbed water in Acrylic Resins to reduce the tensile strength of the material. Solubility is also an important property because it represents the mass of soluble materials from the polymers. METHODS Ten Acrylic resin-based materials were evaluated: two heat cure Acrylic Resins (De Trey QC-20, Meliodent Heat Cure) and eight self cure Acrylic Resins (Meliodent Cold, Akrileks, Akribel, Akribel Transparent, Vertex Trayplast, Formatray, Dentalon Plus, Palavit G). To evaluate water sorption and water solubility, thirty square-shaped specimens (20x20x1.5 mm) were fabricated from the wax specimens. One way ANOVA test, Tukey test and Pearson corrcorrelation coefficient performed for data. RESULTS Water sorption mean values varied from 11.33+/-0.33 to 30.46+/-0.55 mug/mm(3). Water solubility mean values varied from -0.05+/-0.23 to 3.69+/-0.12 mug/mm(3). There was statistically significant difference between mean values of the materials (P<.05). There was no linear correlation between sorption and solubility values. CONCLUSIONS The results of the water sorption and water solubility values of both self-cured and heat-cured Acrylic Resins were in accordance with the ISO specification. No correlation found between water sorption and water solubility values.

  • The Evaluation of Water Sorption/Solubility on Various Acrylic Resins
    European Journal of Dentistry, 2008
    Co-Authors: Suleyman Hakan Tuna, Filiz Keyf, Hasan Onder Gumus, Cengiz Uzun
    Abstract:

    OBJECTIVES: The absorption of water by Acrylic Resins is a phenomenon of considerable importance since it is accompanied by dimensional changes, a further undesirable effect of absorbed water in Acrylic Resins to reduce the tensile strength of the material. Solubility is also an important property because it represents the mass of soluble materials from the polymers. METHODS: Ten Acrylic resin-based materials were evaluated: two heat cure Acrylic Resins (De Trey QC-20, Meliodent Heat Cure) and eight self cure Acrylic Resins (Meliodent Cold, Akrileks, Akribel, Akribel Transparent, Vertex Trayplast, Formatray, Dentalon Plus, Palavit G). To evaluate water sorption and water solubility, thirty square-shaped specimens (20x20x1.5 mm) were fabricated from the wax specimens. One way ANOVA test, Tukey test and Pearson corrcorrelation coefficient performed for data. RESULTS: Water sorption mean values varied from 11.33+/-0.33 to 30.46+/-0.55 mug/mm(3). Water solubility mean values varied from -0.05+/-0.23 to 3.69+/-0.12 mug/mm(3). There was statistically significant difference between mean values of the materials (P

T.j. Rockett – One of the best experts on this subject based on the ideXlab platform.

  • Interactions of water with unsaturated polyester, vinyl ester and Acrylic Resins
    Polymer, 1992
    Co-Authors: Sang-baek Lee, T.j. Rockett, R.d. Hoffman
    Abstract:

    Abstract Moisture diffusion in unsaturated polyester, vinyl ester and Acrylic Resins exposed to various relative humidities and temperatures was investigated. The effects on water uptake of the type and amount of initiator, the post-curing treatment and specimen thickness were evaluated. A weight loss during exposure was observed in some Resins; the true equilibrium water content and the diffusion coefficient could not be determined for these polymers. Absorption-desorption-reabsorption (ADR) experiments were conducted to determine the true equilibrium water contents and diffusion coefficients. These ADR experiments also show whether a resin exhibits a continuous weight loss during long term water exposure, a phenomenon associated with degradation of the polymer network, or whether the loss is caused only by the release of residual species. The water diffusion behaviour for polymers containing disc cracks was compared with the behaviour of polymers without disc cracks. Diffusion coefficients and saturation values are given for orthophthalic polyesters, isophthalic polyesters, vinyl ester and Acrylic Resins at 65°C and a 75% relative humidity.

Suleyman Hakan Tuna – One of the best experts on this subject based on the ideXlab platform.

  • the evaluation of water sorption solubility on various Acrylic Resins
    European Journal of Dentistry, 2008
    Co-Authors: Suleyman Hakan Tuna, Filiz Keyf, Hasan Onder Gumus, Cengiz Uzun
    Abstract:

    OBJECTIVES The absorption of water by Acrylic Resins is a phenomenon of considerable importance since it is accompanied by dimensional changes, a further undesirable effect of absorbed water in Acrylic Resins to reduce the tensile strength of the material. Solubility is also an important property because it represents the mass of soluble materials from the polymers. METHODS Ten Acrylic resin-based materials were evaluated: two heat cure Acrylic Resins (De Trey QC-20, Meliodent Heat Cure) and eight self cure Acrylic Resins (Meliodent Cold, Akrileks, Akribel, Akribel Transparent, Vertex Trayplast, Formatray, Dentalon Plus, Palavit G). To evaluate water sorption and water solubility, thirty square-shaped specimens (20x20x1.5 mm) were fabricated from the wax specimens. One way ANOVA test, Tukey test and Pearson correlation coefficient performed for data. RESULTS Water sorption mean values varied from 11.33+/-0.33 to 30.46+/-0.55 mug/mm(3). Water solubility mean values varied from -0.05+/-0.23 to 3.69+/-0.12 mug/mm(3). There was statistically significant difference between mean values of the materials (P<.05). There was no linear correlation between sorption and solubility values. CONCLUSIONS The results of the water sorption and water solubility values of both self-cured and heat-cured Acrylic Resins were in accordance with the ISO specification. No correlation found between water sorption and water solubility values.

  • The Evaluation of Water Sorption/Solubility on Various Acrylic Resins
    European Journal of Dentistry, 2008
    Co-Authors: Suleyman Hakan Tuna, Filiz Keyf, Hasan Onder Gumus, Cengiz Uzun
    Abstract:

    OBJECTIVES: The absorption of water by Acrylic Resins is a phenomenon of considerable importance since it is accompanied by dimensional changes, a further undesirable effect of absorbed water in Acrylic Resins to reduce the tensile strength of the material. Solubility is also an important property because it represents the mass of soluble materials from the polymers. METHODS: Ten Acrylic resin-based materials were evaluated: two heat cure Acrylic Resins (De Trey QC-20, Meliodent Heat Cure) and eight self cure Acrylic Resins (Meliodent Cold, Akrileks, Akribel, Akribel Transparent, Vertex Trayplast, Formatray, Dentalon Plus, Palavit G). To evaluate water sorption and water solubility, thirty square-shaped specimens (20x20x1.5 mm) were fabricated from the wax specimens. One way ANOVA test, Tukey test and Pearson correlation coefficient performed for data. RESULTS: Water sorption mean values varied from 11.33+/-0.33 to 30.46+/-0.55 mug/mm(3). Water solubility mean values varied from -0.05+/-0.23 to 3.69+/-0.12 mug/mm(3). There was statistically significant difference between mean values of the materials (P