The Experts below are selected from a list of 3054 Experts worldwide ranked by ideXlab platform

Gillian R Goward - One of the best experts on this subject based on the ideXlab platform.

  • influences of casting solvents on proton dynamics within sulfonated PolyEther Ether Ketones s peeks studied using high resolution solid state nmr
    Journal of Membrane Science, 2008
    Co-Authors: C M Mills, Gillian R Goward
    Abstract:

    Abstract Proton mobilities of S-PEEK membranes with variable degrees of sulfonation (DS), and of S-PEEK membranes cast from different solvents were studied using high-resolution solid-state 1 H MAS NMR. In the hydrated S-PEEKs, a single resonance for water-associated sulfonic acid protons was observed for S-PEEK with DS = 58 and 95%, which indicates that the acid protons in either of these S-PEEK samples have similar environments, suggesting a similar distribution of water at each sulfonic acid site. However, there are multiple resonances for water-associated sulfonic acid protons in S-PEEK with DS = 72 and 86%. This suggests distinct acid proton environments resulting from an uneven distribution of water to sulfonic acid protons in these S-PEEK membranes, explaining the fact that these two fully hydrated S-PEEKs show similar conductivities although they have large differences in water content and DS. For S-PEEK membranes cast from different solvents, stronger polymer chain interactions were observed in S-PEEK from N , N -dimethylformamide (DMF) than in those from N , N -dimethylacetamide (DMAc). This could explain why the former exhibits lower proton conductivity although it has the same water content and DS as the latter. S-PEEKs cast from DMAc and dimethylsulfoxide (DMSO) have large differences in water content, but show very similar proton conductivity at high relative humidity. In all cases, solid-state 1 H NMR is shown to be a very sensitive probe of local environments as a function of the casting solvent, degree of sulfonation, and relative humidity, as such spectra provide detailed information about the distribution of acid protons in the membranes.

Marietheres Weber - One of the best experts on this subject based on the ideXlab platform.

  • effects of endodontic irrigants on material and surface properties of biocompatible thermoplastics
    Dentistry journal, 2019
    Co-Authors: Michael Kucher, Martin Dannemann, Niels Modler, Christian Hannig, Marietheres Weber
    Abstract:

    Passive irrigation is an efficient method for a successful endodontic treatment. During sonic activation biocompatible polymer tips are used to activate irrigants. Compared to ultrasonic activation with metallic tips, polymer tips have the advantage of a reduced risk of fracture and minimise dentine damage. Hence, two polymers, PolyEther Ether Ketones (PEEK) and polyamide (PA6), were identified for the manufacturing of novel irrigation tips. The chemical resistance against the irrigants ethylenediaminetetraacetic acid (EDTA) 20%, chlorhexidine gluconate (CHX) 2% and sodium hypochlorite (NaOCl) 5.25% was analysed. Using microindentation, the change of hardness, elasticity, surface roughness and appearance of the polymers was determined. PA6 had a high absorption of irrigant compared to PEEK. PEEK was resistant to the investigated irrigants and showed no significant alteration of surface and mechanical properties, whereas PA6 slightly increased its hardness, elastic modulus and surface roughness during long-term exposure at 37 °C. However, PA6 tips seem to be a promising disposable product due to the material's high deformability and low manufacturing costs. Particularly with regard to structural-dynamic properties and high chemical resistance, PEEK can be considered as a material for reusable irrigation tips.

  • Effects of Endodontic Irrigants on Material and Surface Properties of Biocompatible Thermoplastics
    MDPI AG, 2019
    Co-Authors: Michael Kucher, Martin Dannemann, Niels Modler, Christian Hannig, Marietheres Weber
    Abstract:

    Passive irrigation is an efficient method for a successful endodontic treatment. During sonic activation biocompatible polymer tips are used to activate irrigants. Compared to ultrasonic activation with metallic tips, polymer tips have the advantage of a reduced risk of fracture and minimise dentine damage. Hence, two polymers, PolyEther Ether Ketones (PEEK) and polyamide (PA6), were identified for the manufacturing of novel irrigation tips. The chemical resistance against the irrigants ethylenediaminetetraacetic acid (EDTA) 20%, chlorhexidine gluconate (CHX) 2% and sodium hypochlorite (NaOCl) 5.25% was analysed. Using microindentation, the change of hardness, elasticity, surface roughness and appearance of the polymers was determined. PA6 had a high absorption of irrigant compared to PEEK. PEEK was resistant to the investigated irrigants and showed no significant alteration of surface and mechanical properties, whereas PA6 slightly increased its hardness, elastic modulus and surface roughness during long-term exposure at 37 °C. However, PA6 tips seem to be a promising disposable product due to the material’s high deformability and low manufacturing costs. Particularly with regard to structural-dynamic properties and high chemical resistance, PEEK can be considered as a material for reusable irrigation tips

C M Mills - One of the best experts on this subject based on the ideXlab platform.

  • influences of casting solvents on proton dynamics within sulfonated PolyEther Ether Ketones s peeks studied using high resolution solid state nmr
    Journal of Membrane Science, 2008
    Co-Authors: C M Mills, Gillian R Goward
    Abstract:

    Abstract Proton mobilities of S-PEEK membranes with variable degrees of sulfonation (DS), and of S-PEEK membranes cast from different solvents were studied using high-resolution solid-state 1 H MAS NMR. In the hydrated S-PEEKs, a single resonance for water-associated sulfonic acid protons was observed for S-PEEK with DS = 58 and 95%, which indicates that the acid protons in either of these S-PEEK samples have similar environments, suggesting a similar distribution of water at each sulfonic acid site. However, there are multiple resonances for water-associated sulfonic acid protons in S-PEEK with DS = 72 and 86%. This suggests distinct acid proton environments resulting from an uneven distribution of water to sulfonic acid protons in these S-PEEK membranes, explaining the fact that these two fully hydrated S-PEEKs show similar conductivities although they have large differences in water content and DS. For S-PEEK membranes cast from different solvents, stronger polymer chain interactions were observed in S-PEEK from N , N -dimethylformamide (DMF) than in those from N , N -dimethylacetamide (DMAc). This could explain why the former exhibits lower proton conductivity although it has the same water content and DS as the latter. S-PEEKs cast from DMAc and dimethylsulfoxide (DMSO) have large differences in water content, but show very similar proton conductivity at high relative humidity. In all cases, solid-state 1 H NMR is shown to be a very sensitive probe of local environments as a function of the casting solvent, degree of sulfonation, and relative humidity, as such spectra provide detailed information about the distribution of acid protons in the membranes.

Michael Kucher - One of the best experts on this subject based on the ideXlab platform.

  • effects of endodontic irrigants on material and surface properties of biocompatible thermoplastics
    Dentistry journal, 2019
    Co-Authors: Michael Kucher, Martin Dannemann, Niels Modler, Christian Hannig, Marietheres Weber
    Abstract:

    Passive irrigation is an efficient method for a successful endodontic treatment. During sonic activation biocompatible polymer tips are used to activate irrigants. Compared to ultrasonic activation with metallic tips, polymer tips have the advantage of a reduced risk of fracture and minimise dentine damage. Hence, two polymers, PolyEther Ether Ketones (PEEK) and polyamide (PA6), were identified for the manufacturing of novel irrigation tips. The chemical resistance against the irrigants ethylenediaminetetraacetic acid (EDTA) 20%, chlorhexidine gluconate (CHX) 2% and sodium hypochlorite (NaOCl) 5.25% was analysed. Using microindentation, the change of hardness, elasticity, surface roughness and appearance of the polymers was determined. PA6 had a high absorption of irrigant compared to PEEK. PEEK was resistant to the investigated irrigants and showed no significant alteration of surface and mechanical properties, whereas PA6 slightly increased its hardness, elastic modulus and surface roughness during long-term exposure at 37 °C. However, PA6 tips seem to be a promising disposable product due to the material's high deformability and low manufacturing costs. Particularly with regard to structural-dynamic properties and high chemical resistance, PEEK can be considered as a material for reusable irrigation tips.

  • Effects of Endodontic Irrigants on Material and Surface Properties of Biocompatible Thermoplastics
    MDPI AG, 2019
    Co-Authors: Michael Kucher, Martin Dannemann, Niels Modler, Christian Hannig, Marietheres Weber
    Abstract:

    Passive irrigation is an efficient method for a successful endodontic treatment. During sonic activation biocompatible polymer tips are used to activate irrigants. Compared to ultrasonic activation with metallic tips, polymer tips have the advantage of a reduced risk of fracture and minimise dentine damage. Hence, two polymers, PolyEther Ether Ketones (PEEK) and polyamide (PA6), were identified for the manufacturing of novel irrigation tips. The chemical resistance against the irrigants ethylenediaminetetraacetic acid (EDTA) 20%, chlorhexidine gluconate (CHX) 2% and sodium hypochlorite (NaOCl) 5.25% was analysed. Using microindentation, the change of hardness, elasticity, surface roughness and appearance of the polymers was determined. PA6 had a high absorption of irrigant compared to PEEK. PEEK was resistant to the investigated irrigants and showed no significant alteration of surface and mechanical properties, whereas PA6 slightly increased its hardness, elastic modulus and surface roughness during long-term exposure at 37 °C. However, PA6 tips seem to be a promising disposable product due to the material’s high deformability and low manufacturing costs. Particularly with regard to structural-dynamic properties and high chemical resistance, PEEK can be considered as a material for reusable irrigation tips

Martin Dannemann - One of the best experts on this subject based on the ideXlab platform.

  • effects of endodontic irrigants on material and surface properties of biocompatible thermoplastics
    Dentistry journal, 2019
    Co-Authors: Michael Kucher, Martin Dannemann, Niels Modler, Christian Hannig, Marietheres Weber
    Abstract:

    Passive irrigation is an efficient method for a successful endodontic treatment. During sonic activation biocompatible polymer tips are used to activate irrigants. Compared to ultrasonic activation with metallic tips, polymer tips have the advantage of a reduced risk of fracture and minimise dentine damage. Hence, two polymers, PolyEther Ether Ketones (PEEK) and polyamide (PA6), were identified for the manufacturing of novel irrigation tips. The chemical resistance against the irrigants ethylenediaminetetraacetic acid (EDTA) 20%, chlorhexidine gluconate (CHX) 2% and sodium hypochlorite (NaOCl) 5.25% was analysed. Using microindentation, the change of hardness, elasticity, surface roughness and appearance of the polymers was determined. PA6 had a high absorption of irrigant compared to PEEK. PEEK was resistant to the investigated irrigants and showed no significant alteration of surface and mechanical properties, whereas PA6 slightly increased its hardness, elastic modulus and surface roughness during long-term exposure at 37 °C. However, PA6 tips seem to be a promising disposable product due to the material's high deformability and low manufacturing costs. Particularly with regard to structural-dynamic properties and high chemical resistance, PEEK can be considered as a material for reusable irrigation tips.

  • Effects of Endodontic Irrigants on Material and Surface Properties of Biocompatible Thermoplastics
    MDPI AG, 2019
    Co-Authors: Michael Kucher, Martin Dannemann, Niels Modler, Christian Hannig, Marietheres Weber
    Abstract:

    Passive irrigation is an efficient method for a successful endodontic treatment. During sonic activation biocompatible polymer tips are used to activate irrigants. Compared to ultrasonic activation with metallic tips, polymer tips have the advantage of a reduced risk of fracture and minimise dentine damage. Hence, two polymers, PolyEther Ether Ketones (PEEK) and polyamide (PA6), were identified for the manufacturing of novel irrigation tips. The chemical resistance against the irrigants ethylenediaminetetraacetic acid (EDTA) 20%, chlorhexidine gluconate (CHX) 2% and sodium hypochlorite (NaOCl) 5.25% was analysed. Using microindentation, the change of hardness, elasticity, surface roughness and appearance of the polymers was determined. PA6 had a high absorption of irrigant compared to PEEK. PEEK was resistant to the investigated irrigants and showed no significant alteration of surface and mechanical properties, whereas PA6 slightly increased its hardness, elastic modulus and surface roughness during long-term exposure at 37 °C. However, PA6 tips seem to be a promising disposable product due to the material’s high deformability and low manufacturing costs. Particularly with regard to structural-dynamic properties and high chemical resistance, PEEK can be considered as a material for reusable irrigation tips