Fabrication and characterisation of ceramic-polymer composites for orthodontic brackets

Objectives: To produce a ceramic-polymer composite for possible use as an aesthetic orthodontic bracket material. Design and Setting: A laboratory study undertaken at the Dental Biomaterials Laboratory, School of Oral and Dental Science, Bristol. Materials and methods: Freeze casting was used...

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Main Authors:	Cheong, Joo Ming, Su, B., Sandy, J. R, Ireland, A.J
Format:	Conference or Workshop Item
Language:	English English English
Published:	2017
Subjects:	RK Dentistry
Online Access:	http://irep.iium.edu.my/70569/ http://irep.iium.edu.my/70569/1/BOC%20poster%202017%20finalised.pdf http://irep.iium.edu.my/70569/2/British%20Orthodontic%20Conference%20Programme.pdf http://irep.iium.edu.my/70569/3/Poster%20presenter%20letter.pdf

id	iium-70569
recordtype	eprints
spelling	iium-705692019-02-28T08:13:17Z http://irep.iium.edu.my/70569/ Fabrication and characterisation of ceramic-polymer composites for orthodontic brackets Cheong, Joo Ming Su, B. Sandy, J. R Ireland, A.J RK Dentistry Objectives: To produce a ceramic-polymer composite for possible use as an aesthetic orthodontic bracket material. Design and Setting: A laboratory study undertaken at the Dental Biomaterials Laboratory, School of Oral and Dental Science, Bristol. Materials and methods: Freeze casting was used to fabricate 15.0%, 20.0%, 25.0%, 30.0% and 35.0% by volume porous ceramic frameworks and using 5 different temperature gradients from 0ºC down to: -10ºC, -20ºC, -30ºC, -40ºC and -50ºC. 5 frameworks were created for each of the ceramic loads/temperature gradients. Each framework was then infiltrated with UDMA-TEGDMA polymer, before being characterised using density, porosity, compressive strength and modulus of elasticity measurements. Results: A directional lamellar structure, with graduated nature of the ceramic framework was observed. The density of the ceramic frameworks increased with increasing ceramic % by volume from 15.0% to 35.0% (at temperature gradient 0ºC to -10ºC). An increase in porosity from the ceramic-rich layer to the polymer-rich layer was observed at 15.0% and 20.0% ceramic concentration. The compressive strength was significantly higher for frameworks made using 30.0% ceramic by volume loading and fabricated across a temperature gradient of 0ºC to -10ºC (p<0.001). The manipulation of the temperature gradient below 0ºC did not affect the density, porosity and compressive strength. The effect on the modulus of elasticity was small but statistically significant. Silane did not improve the mechanical properties of the composite materials. At some ceramic concentration, the polymer-rich layer had higher compressive strength values than the ceramic-rich layer. Conclusions: Ceramic-polymer composite materials produced using the technique of freeze casting show great promise as potential aesthetic orthodontic bracket materials. 2017-09-14 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/70569/1/BOC%20poster%202017%20finalised.pdf application/pdf en http://irep.iium.edu.my/70569/2/British%20Orthodontic%20Conference%20Programme.pdf application/pdf en http://irep.iium.edu.my/70569/3/Poster%20presenter%20letter.pdf Cheong, Joo Ming and Su, B. and Sandy, J. R and Ireland, A.J (2017) Fabrication and characterisation of ceramic-polymer composites for orthodontic brackets. In: British Orthodontic Conference (BOC), 14-16 September 2017, Manchester Central, Windmill Street, Manchester M2 3GX. (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English English
topic	RK Dentistry
spellingShingle	RK Dentistry Cheong, Joo Ming Su, B. Sandy, J. R Ireland, A.J Fabrication and characterisation of ceramic-polymer composites for orthodontic brackets
description	Objectives: To produce a ceramic-polymer composite for possible use as an aesthetic orthodontic bracket material. Design and Setting: A laboratory study undertaken at the Dental Biomaterials Laboratory, School of Oral and Dental Science, Bristol. Materials and methods: Freeze casting was used to fabricate 15.0%, 20.0%, 25.0%, 30.0% and 35.0% by volume porous ceramic frameworks and using 5 different temperature gradients from 0ºC down to: -10ºC, -20ºC, -30ºC, -40ºC and -50ºC. 5 frameworks were created for each of the ceramic loads/temperature gradients. Each framework was then infiltrated with UDMA-TEGDMA polymer, before being characterised using density, porosity, compressive strength and modulus of elasticity measurements. Results: A directional lamellar structure, with graduated nature of the ceramic framework was observed. The density of the ceramic frameworks increased with increasing ceramic % by volume from 15.0% to 35.0% (at temperature gradient 0ºC to -10ºC). An increase in porosity from the ceramic-rich layer to the polymer-rich layer was observed at 15.0% and 20.0% ceramic concentration. The compressive strength was significantly higher for frameworks made using 30.0% ceramic by volume loading and fabricated across a temperature gradient of 0ºC to -10ºC (p<0.001). The manipulation of the temperature gradient below 0ºC did not affect the density, porosity and compressive strength. The effect on the modulus of elasticity was small but statistically significant. Silane did not improve the mechanical properties of the composite materials. At some ceramic concentration, the polymer-rich layer had higher compressive strength values than the ceramic-rich layer. Conclusions: Ceramic-polymer composite materials produced using the technique of freeze casting show great promise as potential aesthetic orthodontic bracket materials.
format	Conference or Workshop Item
author	Cheong, Joo Ming Su, B. Sandy, J. R Ireland, A.J
author_facet	Cheong, Joo Ming Su, B. Sandy, J. R Ireland, A.J
author_sort	Cheong, Joo Ming
title	Fabrication and characterisation of ceramic-polymer composites for orthodontic brackets
title_short	Fabrication and characterisation of ceramic-polymer composites for orthodontic brackets
title_full	Fabrication and characterisation of ceramic-polymer composites for orthodontic brackets
title_fullStr	Fabrication and characterisation of ceramic-polymer composites for orthodontic brackets
title_full_unstemmed	Fabrication and characterisation of ceramic-polymer composites for orthodontic brackets
title_sort	fabrication and characterisation of ceramic-polymer composites for orthodontic brackets
publishDate	2017
url	http://irep.iium.edu.my/70569/ http://irep.iium.edu.my/70569/1/BOC%20poster%202017%20finalised.pdf http://irep.iium.edu.my/70569/2/British%20Orthodontic%20Conference%20Programme.pdf http://irep.iium.edu.my/70569/3/Poster%20presenter%20letter.pdf
first_indexed	2023-09-18T21:40:09Z
last_indexed	2023-09-18T21:40:09Z
_version_	1777413085701603328

Fabrication and characterisation of ceramic-polymer composites for orthodontic brackets

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