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Design and evaluation of alumina/feldspar resin infiltrated dental composite materials Le Roux, Andre Rayne Lachman, Nirusha Walker, Mark Botha, C. Theo Dental bonding Composite materials Dental materials Submitted in fulfillment of the degree of Doctor of Dental Material Science in the Durban University of Technology, Durban, South Africa, 2008. Introduction: Incorporating a feldspar chemical bond between alumina filler particles is expected to increase the wear resistant and flexural strength properties, while reducing flexibility of dental composites. Aims and Objectives: An investigation was carried out to evaluate the influence of the feldspar chemical bonding between alumina filler particles on wear, flexural strength and flexibility of experimental alumina/feldspar dental composites. It was hypothesized that wear resistance and flexural strength would be significantly increased with increased feldspar mass, while flexibility was expected to decrease. Methods: Alumina was chemically sintered and bonded with 30%, 40%, 50% and 60% feldspar mass, silanized and infiltrated with UDMA resin to prepare the dental restorative composite material specimens. Results and conclusions: Significantly higher wear resistant characteristics resulted with increased feldspar mass (p<0.5). Improvements in flexural strength characteristics as the feldspar mass was increased was not statistically different (p>0.5). Flexibility characteristics as the feldspar mass was increased was not statistically different (p>0.5). The alumina/feldspar specimens showed lower flexibility (mm displacement) than SR ADORO (p<0.05). Feldspar chemical bonding between the alumina particles may improve on the wear resistance and Flexibility of alumina/feldspar composites when compared to SR ADORO. This study evaluated the influence of a chemical feldspar bond between alumina filler particles. D 2009-06-02T11:59:35Z 2009-06-02T11:59:35Z 2008 Thesis 315106 http://hdl.handle.net/10321/430 https://doi.org/10.51415/10321/430 en 205 p application/pdf