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This dissertation, Bonding of Dental Alloys to Enamel by 孔祥陞, Cheung-sing, Tony, Hung, 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 1 ABSTRACT Purpose: To investigate effects of metal thicknesses and surface treatment methods on the shear bond strength of a dual cured composite resin bonded to three different ceramo-metal dental alloys: nickel-chromium, high-gold and high-palladium dental alloys. Materials and Methods: A dual-cured adhesive composite resin was used to bond dental metal alloy plates of different thickness, composition and surface treatment to acid etched bovine enamel. The specimens (n=180) were stored in water for 24 hours and then loaded in shear with a universal testing machine to failure and bond strengths were recorded. Results: Using ANOVA, the mean shear bond strength for nickel chromium was found to be significantly higher than the other two noble metals (P0.05). Heat treatment of the noble metals showed no significant difference in bond strength compared with sandblasted samples (P>0.05). There was a significant increase in mean shear bond strength with increase in metal 1 Abstract thickness from 0.5mm to 0.7mm (PConclusion: Within the limitations of this study, resin-bonded metal alloy restorations with thickness of 0.7mm or more are preferred over 0.5mm thickness. The differences in shear bond strength between the two noble alloys and the nickel chromium alloy is likely due to the lack of suitable metal oxide. Heat treatment of precious metal alloys did not increase the bond strength to etched enamel and therefore further studies should investigate the use of copper containing gold and non-gold noble alloys which are thought to create suitable oxides for bonding. The relationship between composition of metal alloy, method of surface treatment and the choice of adhesive primer should be carefully considered before clinical use. DOI: 10.5353/th_b3955815 Subjects: Dental metallurgyDental enamelDental bonding

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