Polymerisation kinetics and optical phenomena of photoactive dental resins

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http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/3898 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/3898 http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/3898 archive 4031 disk0/00/00/17/30 2011-07-06 12:23:08 2019-01-23 09:54:44 2011-07-19 16:40:51 thesis show 0 Hadis Mohammed Abdul Palin William Shortall Adrian C University of Birmingham Polymerisation kinetics and optical phenomena of photoactive dental resins unpub RK 10col_mede Globally, several shortcomings of dental resin based composites (RBCs) remain. This may be related to problems associated with incomplete conversion (40-70%), polymerisation shrinkage (1-4% by volume) and the stress generated at the tooth/restoration interface. Additionally, the increased number of technique sensitive incremental steps required to fill relatively large cavities is due to inefficient light transmission at depths greater than 2mm. The current investigation demonstrates the applicability of the exposure reciprocity law in photoactive dental materials in order to try and improve these shortcomings. The development techniques that will allow dynamic monitoring of optical and physical change will aid material development with the goal of improving cure depths. The current investigation has demonstrated the use of several analytical techniques (FT-IR spectroscopy, UV-Vis Spectroscopy and low coherence interferometry) and shown the complexity of optical phenomena within RBCs, which are affected by material composition as well as cavity dimensions. Whilst research continues to develop a novel RBC with reduced shrinkage and improved depths of cure, there is currently no commercially available solution to such problems. Consequently a better understanding of the setting reaction, optical properties and physical properties will aid material development. 2011-07 2011-03 graduation eng This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 222 University of Birmingham School of Dentistry d_ph epsrc 2011-07 graduation