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Title: Fabrication and characterisation of anisotropic ceramic/polymer composite for orthodontic brackets
Author: Stewart , Samantha B.
ISNI:       0000 0004 5921 381X
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2014
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Objective: To develop and then test a novel hybrid ceramic/ resin material for use as a possible aesthetic Orthodontic bracket material. Design: A laboratory investigation into the production of a hybrid ceramic/ resin material using the technique of freeze casting, followed by characterisation using mechanical testing methods. Setting: Dental biomaterials laboratory, School of Oral and Dental Science, Bristol Materials and Methods: The technique of freeze casting was used to create porous ceramic frameworks, which were then infiltrated with epoxy resin. In this way bespoke gradated hybrid materials, ranging from 10% to 40% ceramic at one surface and near 100% epoxy resin at the other were created. Samples were characterised using compressive strength and abrasion test methods and compared with samples of pure ceramic and pure epoxy resin. Results: There was no significant difference in compressive strength between pure ceramic and the 40% by volume ceramic samples. Compressive strength was significantly lower for samples with 10%, 20%, 30% ceramic and for samples of 100% epoxy resin. Following abrasion testing the mean difference in surface roughness over 2 years of simulated tooth brushing was less than 1.5 microns for any of the specimens. Conclusions: Novel hybrid ceramic/ resins can be created using freeze casting, with 40% ceramic by volume showing the greatest promise as a potential aesthetic orthodontic bracket material. It behaved similarly to 100% ceramic at what would be its oral surface and should likewise perform similarly to a polymeric bracket at the enamel surface.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (D.D.S.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available