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Fluid Transport Across Bonded Dentin Interfaces: (English)

Fluid Transport Across Bonded Dentin Interfaces: (English)

          
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About the Book

This dissertation, "Fluid Transport Across Bonded Dentin Interfaces" by Kar-yung, Cynthia, Yiu, 姚嘉榕, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled Fluid Transport Across Bonded Dentin Interfaces Submitted by Cynthia Kar Yung YIU for the degree of Doctor of Philosophy at The University of Hong Kong May 2006 Knowledge of fluid transport across dentin bonded interfaces which can adversely affect the integrity of bonded restorations is incomplete. Initially, effects of resin hydrophilicity on silver penetration, water-vapour permeability, water sorption and UTS after aging of copolymer blends with increasing hydrophilicity were studied. Permeability of polymerized resin beams after immersion in ammoniacal silver nitrate was examined using TEM. Weight loss from a water-filled Fisher permeability cup through polymerized resin films was evaluated. Water sorption characteristics of polymerized resin disks were measured before and after water immersion and desiccation. UTS of polymerized resin blocks was determined after water or oil aging. Adhesive-solvent mixtures, prepared by addition of solvent to copolymer blends, were weighed before and after solvent evaporation. Silver penetration revealed water trees and silver grains in hydrophilic copolymer blends. Cumulative water loss, maximum water sorption, UTS reduction and solvent retention in adhesive-solvent mixtures, increased with hydrophilicity of copolymer blends. Hydrophilic resins used in simplified dentin adhesives are permeable, and permit water transportation across bonded interfaces. Secondly, fluid transport across resin-dentin interfaces was addressed. Nanoleakage across bonded dentin can be reduced using NaOCl to remove unprotected collagen before bonding. However, compromised bond strengths occur with some single-bottle total-etch adhesives when applied to NaOCl-treated dentin. Hence, the relationship between nanoleakage and reversal of compromised bonding was examined. Composite-dentin beams (0.9mm x 0.9mm) made from NaOCl-treated, acid-etched human dentin, bonded with single-bottle total-etch adhesives, were subjected to μTBS testing and nanoleakage evaluation using TEM. After NaOCl application, reticular nanoleakage in hybrid layers was replaced by vertical, shag-carpet-like patterns. Treatment with sodium ascorbate eliminated this nanoleakage. Residual NaOCl within porosities of mineralized dentin may compromise polymerization and bond strength. Oxalate desensitizers applied on acid-etched dentin prior to adhesive application can reduce fluid movement across bonded interfaces. However, solubility of calcium oxalate increases in acidic solution. Thus, the acidity of simplified etch-and-rinse adhesives bonded to desensitizer-treated acid-etched dentin was evaluated. Composite-dentin beams (0.9mm x 0.9mm) from acid-etched human dentin treated with oxalate desensitizers and bonded with simplified etch-and-rinse adhesives, were subjected to μTBS testing. Hydraulic conductance of bonded dentin was measured at 20cm of water pressure. Ultrastructure of composite-dentin beams were examined using SEM and TEM. Convective water flux reduction and bonding efficacy are adhesive specific and inapplicable to low acidity adhesives due to formation of globular structures along bonded interfaces. Finally, SEM, FE-ESEM and TEM were used to study the ultrastructure of GIC and RMGIC bonded dentin interfaces. Dentin surfaces from extracted third molars, bonded with auto-cured GIC and RMGIC, w


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Product Details
  • ISBN-13: 9781361436721
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 370
  • Spine Width: 22 mm
  • Width: 216 mm
  • ISBN-10: 1361436727
  • Publisher Date: 27 Jan 2017
  • Binding: Hardback
  • Language: English
  • Series Title: English
  • Weight: 1143 gr


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