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Use of quantitative light-induced fluorescence to monitor tooth whitening

Amaechi, Bennett T. and Higham, Susan M. (2001) Use of quantitative light-induced fluorescence to monitor tooth whitening. SPIE Proceedings, 4249 (6). pp. 157-162. ISSN 1605-7422

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Abstract

The changing oftooth shade by whitening agents occurs gradually. Apart from being subjective and affected by the conditions ofthe surroundings, visual observation cannot detect a very slight change in tooth colour. An electronic method, which can communicate the colour change quantitatively, would be more reliable. Quantitative Light-induced Fluorescence (QLF) was developed to detect and assess dental caries based on the phenomenon of change of autofluorescence of a tooth by demineralisation. However, stains on the tooth surface exhibit the same phenomenon, and therefore QLF can be used to measure the percentage fluorescence change of stained enamel with respect to surrounding unstained enamel. The present study describes a technique ofassessing the effect ofa tooth-whitening agent using QLF. This was demonstrated in two experiments in which either wholly or partially stained teeth were whitened by intermittent immersion in sodium hypochlorite. Following each immersion, the integrated fluorescence change (SQ) due to the stain was quantified using QLF. In either situation, the value oftQ (%.mm2) decreased linearly as the tooth regained its natural shade. It was concluded that gradual changing ofthe shade ofdiscoloured teeth by a whitening agent could be quantified using QLF.

Item Type:Article
Additional Information:Conference Title: Lasers in Dentistry VII.
Uncontrolled Keywords:sodium hypochiorite, tooth stain; tooth color, stain formation, salivary pellicle, stain removal, quantitative lightinduced fluorescence; tooth whitening, tooth bleaching, optical methods
Subjects:R Medicine > RK Dentistry
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Medicine > School of Dental Sciences
DOI:10.1117/12.424494
Publisher's Statement:Lasers in Dentistry VII, Peter Rechmann, Daniel Fried, Thomas Hennig, Editors, Proceedings of SPIE Vol. 4249 (2001) © 2001 SPIE. http://dx.doi.org/10.1117/12.424494
Refereed:Yes
Status:Published
ID Code:1141
Deposited On:13 Oct 2009 12:18
Last Modified:22 Feb 2012 13:17

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