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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 10 of 18 (0.008 seconds)| 1 |
Fluorcanasite glass-ceramics for dental applicationsAttar, Sabah Gulam January 2006 (has links)
Fluorcanasite, a chain silicate glass ceramic, displaying a combination of high flexural strength and high fracture toughness in comparison with currently available resin-bonded ceramics, is being developed as a material that should be easy to fabricate into a dental restoration. Previous work has focussed on producing a chemically durable formulation of fluorcanasite. Unfortunately, in an attempt to achieve low solubility, the mechanical properties of this material have been compromised. The aim of this study was to assess the influence of compositional changes on the crystallisation and fracture toughness of the fluorcanasite crystalline phases. This study has focused on compositional variations to the tluorcanasite composition of 6OSi~-8Na20-7K20-15CaO-l OCaF2. Fluorite additions were attempted to ascertain the extent to which the 'known' nucleating agent influences the crystalline phase development. Zirconia and silica additions were made to the formulation to improve the mechanical properties while maintaining the chemical solubility of the material. It was found that fluorcanasite glasses of these formulations crystallize to give a combination of canasite and frankamenite phases and at higher zirconia additions, a potassium zirconium silicate phase called wadeite. The attempted reformulations resulted in a composition (6.11Na20-S.35K20-11.46CaO- 11.46CaF2-64.82Si02-0.80Zr < h) which upon a standard two-stage heat treatment schedule crystallised to give a glass ceramic with substantially improved mechanical properties. A greater than three-fold increase was achieved in the fracture toughness in comparison to the base composition and is comparable to current commercial dental materials indicated for use as posterior restorations. This formulation has resulted in a solubility which is within the solubility limits for use as a core material (class 2, ISO 6872:1995 (E» and the glass ceramic has been shown to have adequate machinability for development using the CAD CAM process.
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Physical properties of novel dental composite polymeric systemsHowle, Nina Elizabeth January 2003 (has links)
No description available.
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The crystallisation and flexural strength optimisation of leucite reinforced glass ceramics for dental applicationsCattell, Michael James January 2003 (has links)
No description available.
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A study of the delivery of active agents from polysaccharidesTillett, Darren James January 2003 (has links)
No description available.
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The development and evaluation of a method in-vitro to study the effectiveness and safety of tooth bleachingSulieman, Munther Affram Matti January 2005 (has links)
No description available.
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Development of a sputter deposited calcium phosphate thin film for use as a model dental enamel surfaceTurkington, Marie January 2004 (has links)
No description available.
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Novel composites and modified glass-ionomer cements for dental applicationsShah, Paril January 2005 (has links)
No description available.
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Polymer modified calcium phosphate cements as potential bone substitutesMajekodunmi, Adefolarin January 2004 (has links)
No description available.
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The influence of air bubble pores on strength and surface hardness of dental phosphate bonded investment : application as a die material for dental superplastic formingJuszczyk, Andrzej Stanislaw January 2004 (has links)
No description available.
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Stem cells and tooth developmentModino, Sonie Alix Carmen January 2007 (has links)
No description available.
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