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January 24, 2010 | History

Photodegradation of materials used in maxillofacial prosthetics 1 edition

Photodegradation of materials used in maxillofacial prosthetics
Ngoc Tuan Dinh

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Photodegradation of materials used in maxillofacial prosthetics.

Published 2005 .
Written in English.

About the Book

Background. Prosthodontists use silicones and pigments for extraoral prostheses. Degradation leads to deterioration of optical properties. In vitro work showed that UV and oxidation are potential contributors but the cause is unclear. Objectives. Due to the absence of compositional studies, the aim is to determine the chemical change in two silicones and one pigment after photodegradation. Methods. A pilot determined the analytical techniques suitable for the materials. The main study used UV sources to age samples in different gas environments. Colourimetric measurements were performed at frequent intervals. After degradation, analytical results were compared with those from the pilot study. Results. IR and NMR spectroscopies provided compositional information. The chemical structure dictated the degradation process. For the silicones, the crosslinking reactive sites were the least stable and seemed to be associated with colour degradation. Conclusion. An understanding at the molecular level will result in better solutions to this problem.

Edition Notes

Source: Masters Abstracts International, Volume: 44-02, page: 0806.

Thesis (M.Sc.)--University of Toronto, 2005.

Electronic version licensed for access by U. of T. users.

GERSTEIN MICROTEXT copy on microfiche (2 microfiches).

The Physical Object

163 leaves.
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History Created December 11, 2009 · 2 revisions Download catalog record: RDF / JSON

January 24, 2010 Edited by WorkBot add more information to works
December 11, 2009 Created by WorkBot add works page