The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform

Manuel S Thomas - One of the best experts on this subject based on the ideXlab platform.

  • evaluation and comparison of bond strength to 10 carbamide peroxide bleached enamel following the application of 10 and 25 sodium ascorbate and alpha tocopherol solutions an in vitro study
    Journal of Conservative Dentistry, 2013
    Co-Authors: Asha Thapa, Manuel S Thomas
    Abstract:

    Aim: To evaluate and compare Composite bond strength to carbamide peroxide bleached enamel following the application of 10% and 25% sodium ascorbate and alpha-tocopherol solutions. Materials and Methods: Sixty premolars were divided into six groups. Groups I and VI served as unbleached and bleached controls respectively. Groups II, III, IV and V served as the experimental groups and were subjected to 10% carbamide peroxide bleaching followed by 10 min application of 10% and 25% sodium ascorbate and 10% and 25% alpha-tocopherol solutions, respectively. Following Composite Bonding, shear bond strength was determined and the results were analyzed using ANOVA and Tukey highest significant difference test. Results: Only Group IV showed significantly lower bond strength when compared to Group I (unbleached control). When compared to Group VI (bleached control), except Group IV, groups II, III and V showed significantly higher bond strength. However, there was no statistically significant difference between the experimental groups corresponding to 10% and 25% and similar concentrations of sodium ascorbate and alpha-tocopherol solutions. Conclusion: Following 10% carbamide peroxide bleaching, except 10% alpha tocopherol, 10 min application of 10% and 25% sodium ascorbate and 25% alpha-tocopherol solutions significantly improves the shear bond strength of Composite resin to enamel.

  • Evaluation and comparison of bond strength to 10% carbamide peroxide bleached enamel following the application of 10% and 25% sodium ascorbate and alpha-tocopherol solutions: An in vitro study
    Journal of Conservative Dentistry, 2013
    Co-Authors: Asha Thapa, Manuel S Thomas
    Abstract:

    Aim: To evaluate and compare Composite bond strength to carbamide peroxide bleached enamel following the application of 10% and 25% sodium ascorbate and alpha-tocopherol solutions. Materials and Methods: Sixty premolars were divided into six groups. Groups I and VI served as unbleached and bleached controls respectively. Groups II, III, IV and V served as the experimental groups and were subjected to 10% carbamide peroxide bleaching followed by 10 min application of 10% and 25% sodium ascorbate and 10% and 25% alpha-tocopherol solutions, respectively. Following Composite Bonding, shear bond strength was determined and the results were analyzed using ANOVA and Tukey highest significant difference test. Results: Only Group IV showed significantly lower bond strength when compared to Group I (unbleached control). When compared to Group VI (bleached control), except Group IV, groups II, III and V showed significantly higher bond strength. However, there was no statistically significant difference between the experimental groups corresponding to 10% and 25% and similar concentrations of sodium ascorbate and alpha-tocopherol solutions. Conclusion: Following 10% carbamide peroxide bleaching, except 10% alpha tocopherol, 10 min application of 10% and 25% sodium ascorbate and 25% alpha-tocopherol solutions significantly improves the shear bond strength of Composite resin to enamel.

Asha Thapa - One of the best experts on this subject based on the ideXlab platform.

  • evaluation and comparison of bond strength to 10 carbamide peroxide bleached enamel following the application of 10 and 25 sodium ascorbate and alpha tocopherol solutions an in vitro study
    Journal of Conservative Dentistry, 2013
    Co-Authors: Asha Thapa, Manuel S Thomas
    Abstract:

    Aim: To evaluate and compare Composite bond strength to carbamide peroxide bleached enamel following the application of 10% and 25% sodium ascorbate and alpha-tocopherol solutions. Materials and Methods: Sixty premolars were divided into six groups. Groups I and VI served as unbleached and bleached controls respectively. Groups II, III, IV and V served as the experimental groups and were subjected to 10% carbamide peroxide bleaching followed by 10 min application of 10% and 25% sodium ascorbate and 10% and 25% alpha-tocopherol solutions, respectively. Following Composite Bonding, shear bond strength was determined and the results were analyzed using ANOVA and Tukey highest significant difference test. Results: Only Group IV showed significantly lower bond strength when compared to Group I (unbleached control). When compared to Group VI (bleached control), except Group IV, groups II, III and V showed significantly higher bond strength. However, there was no statistically significant difference between the experimental groups corresponding to 10% and 25% and similar concentrations of sodium ascorbate and alpha-tocopherol solutions. Conclusion: Following 10% carbamide peroxide bleaching, except 10% alpha tocopherol, 10 min application of 10% and 25% sodium ascorbate and 25% alpha-tocopherol solutions significantly improves the shear bond strength of Composite resin to enamel.

  • Evaluation and comparison of bond strength to 10% carbamide peroxide bleached enamel following the application of 10% and 25% sodium ascorbate and alpha-tocopherol solutions: An in vitro study
    Journal of Conservative Dentistry, 2013
    Co-Authors: Asha Thapa, Manuel S Thomas
    Abstract:

    Aim: To evaluate and compare Composite bond strength to carbamide peroxide bleached enamel following the application of 10% and 25% sodium ascorbate and alpha-tocopherol solutions. Materials and Methods: Sixty premolars were divided into six groups. Groups I and VI served as unbleached and bleached controls respectively. Groups II, III, IV and V served as the experimental groups and were subjected to 10% carbamide peroxide bleaching followed by 10 min application of 10% and 25% sodium ascorbate and 10% and 25% alpha-tocopherol solutions, respectively. Following Composite Bonding, shear bond strength was determined and the results were analyzed using ANOVA and Tukey highest significant difference test. Results: Only Group IV showed significantly lower bond strength when compared to Group I (unbleached control). When compared to Group VI (bleached control), except Group IV, groups II, III and V showed significantly higher bond strength. However, there was no statistically significant difference between the experimental groups corresponding to 10% and 25% and similar concentrations of sodium ascorbate and alpha-tocopherol solutions. Conclusion: Following 10% carbamide peroxide bleaching, except 10% alpha tocopherol, 10 min application of 10% and 25% sodium ascorbate and 25% alpha-tocopherol solutions significantly improves the shear bond strength of Composite resin to enamel.

Darshan Devang Divakar - One of the best experts on this subject based on the ideXlab platform.

  • Recent Trends in Surface Treatment Methods for Bonding Composite Cement to Zirconia: A Reveiw.
    Journal of Adhesive Dentistry, 2017
    Co-Authors: Aftab Ahmed Khan, Al Kheraif Aa, Jamaluddin S, Mohamad Ahmed El-sharawy, Darshan Devang Divakar
    Abstract:

    Abstract To evaluate the in vitro studies conducted in the last six years on new zirconia materials to discover and explore current trends in Bonding Composite cement to zirconia substrate. An in-depth review of the in vitro studies performed between 2010 and 2016 was conducted, focusing on the current trends in surface conditioning methods for zirconia ceramic. PubMed was used for searching the literature. Resin Composite Bonding to zirconia, zirconia surface coating, and zirconia surface treatment method were the keywords used. Complete scientific articles were reviewed and evaluated for appropriateness. The literature survey showed a variety of surface treatment techniques comprising grit blasting (laboratory or chairside) with or without silica-coated alumina particles, the use of materials containing phosphate monomers, different silanes and primers, laser irradiation, Si vapor-phase deposition, and selective infiltration etching. The problem of Composite cement Bonding to zirconia has yet to be definitively solved. Nevertheless, the application of phosphate monomer on tribochemically silica-coated zirconia surfaces is currently the least complicated and most efficaceous means of Bonding Composite cement to zirconia. Selective infiltration etching seems to be a promising technique for establishing a durable bond between Composite cement and zirconia, and should be studied further.

  • recent trends in surface treatment methods for Bonding Composite cement to zirconia a reveiw
    Journal of Adhesive Dentistry, 2017
    Co-Authors: Aftab Ahmed Khan, Al Kheraif Aa, Mohamad Ahmed Elsharawy, Saha Jamaluddin, Darshan Devang Divakar
    Abstract:

    Purpose To evaluate the in vitro studies conducted in the last six years on new zirconia materials to discover and explore current trends in Bonding Composite cement to zirconia substrate. Materials and methods An in-depth review of the in vitro studies performed between 2010 and 2016 was conducted, focusing on the current trends in surface conditioning methods for zirconia ceramic. PubMed was used for searching the literature. Resin Composite Bonding to zirconia, zirconia surface coating, and zirconia surface treatment method were the keywords used. Complete scientific articles were reviewed and evaluated for appropriateness. Results The literature survey showed a variety of surface treatment techniques comprising grit blasting (laboratory or chairside) with or without silica-coated alumina particles, the use of materials containing phosphate monomers, different silanes and primers, laser irradiation, Si vapor-phase deposition, and selective infiltration etching. Conclusions The problem of Composite cement Bonding to zirconia has yet to be definitively solved. Nevertheless, the application of phosphate monomer on tribochemically silica-coated zirconia surfaces is currently the least complicated and most efficaceous means of Bonding Composite cement to zirconia. Selective infiltration etching seems to be a promising technique for establishing a durable bond between Composite cement and zirconia, and should be studied further.

Laurent Berthe - One of the best experts on this subject based on the ideXlab platform.

  • Laser shock adhesion test numerical optimization for Composite Bonding assessment
    Composite Structures, 2020
    Co-Authors: Romain Ecault, Fabienne Touchard, Laurent Berthe, Michel Boustié
    Abstract:

    The present work presents the latest development of laser shock adhesion test (LASAT) technology, targeting the weak bond detection in bonded aeronautic structures. This problematic is still holding back a wider use of Bonding, which could however be a significant breakthrough in the way of assembling parts. By mechanically loading the bondline thanks to laser-induced shock waves, LASAT acts as proof test to reveal the presence of local weaknesses. In the present paper, focus is made on the optimization of the laser shock parameters regarding the assembly to test. Objective is to avoid loading too much the Composite, thus avoiding damage, to increase the test performances. Numerical modelling is used, following a specific methodology, to understand the phenomena and identify the key parameters. The basic laser shock configuration was first investigated. Due to the stress distribution, this setting allows one to test a bond whose strength is equal or below 40% of Composite inter-laminar strength. The effects of the laser focal spot on the stress distribution are also quantified. A 4 mm diameter shows good performances for the assembly to test. For the first time, three different optimizations are proposed: tunable pulse duration, double pulses on the front face and symmetrical laser shocks. They are first theoretically described. Numerical results then support these configurations’ performances. The double pulse solution makes it possible to test a bond strength equal or inferior to 80% of Composite inter-laminar strength, when symmetrical pulses enable to reach 100% thanks to a sharp stress distribution. These results are validated by experimental evidence that is also presented. Finally, the present work offers helpful information for the development and deployment of LASAT for aeronautic bonded structures.

  • Quantitative evaluation of the mechanical strength of titanium/Composite Bonding using laser-generated shock waves
    Applied Physics Letters, 2018
    Co-Authors: Mathieu Ducousso, Laurent Berthe, Simon Bardy, Yann Rouchausse, Tomas Bergara, Frédéric Jenson, Nicolas Cuvillier
    Abstract:

    Intense acoustic shock waves were applied to evaluate the mechanical strength of structural epoxy bonds between a TA6V4 titanium alloy and a 3D woven carbon/epoxy Composite material. Two bond types with different mechanical strengths were obtained from two different adhesive reticulations, at 50% and 90% of conversion, resulting in longitudinal static strengths of 10 and 39 MPa and transverse strengths of 15 and 35 MPa, respectively. The GPa shock waves were generated using ns-scale intense laser pulses and reaction principles to a confined plasma expansion. Simulations taking into account the laser-matter interaction, plasma relaxation, and non-linear shock wave propagation were conducted to aid interpretation of the experiments. Good correlations were obtained between the experiments and the simulation and between different measurement methods of the mechanical strength (normalized tests vs laser-generated shock waves). Such results open the door toward certification of structural Bonding.

Nicolas Cuvillier - One of the best experts on this subject based on the ideXlab platform.

  • Quantitative evaluation of the mechanical strength of titanium/Composite Bonding using laser-generated shock waves
    Applied Physics Letters, 2018
    Co-Authors: Mathieu Ducousso, Laurent Berthe, Simon Bardy, Yann Rouchausse, Tomas Bergara, Frédéric Jenson, Nicolas Cuvillier
    Abstract:

    Intense acoustic shock waves were applied to evaluate the mechanical strength of structural epoxy bonds between a TA6V4 titanium alloy and a 3D woven carbon/epoxy Composite material. Two bond types with different mechanical strengths were obtained from two different adhesive reticulations, at 50% and 90% of conversion, resulting in longitudinal static strengths of 10 and 39 MPa and transverse strengths of 15 and 35 MPa, respectively. The GPa shock waves were generated using ns-scale intense laser pulses and reaction principles to a confined plasma expansion. Simulations taking into account the laser-matter interaction, plasma relaxation, and non-linear shock wave propagation were conducted to aid interpretation of the experiments. Good correlations were obtained between the experiments and the simulation and between different measurement methods of the mechanical strength (normalized tests vs laser-generated shock waves). Such results open the door toward certification of structural Bonding.