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Particle motion and stain removal during simulated abrasive tooth cleaning

Lewis, R., Barber, S.C. and Dwyer-Joyce, R.S. (2007) Particle motion and stain removal during simulated abrasive tooth cleaning. Wear, 263 (1-6 SP). pp. 188-197. ISSN 0043-1648

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Stain removal from teeth is important both to prevent decay and for appearance. This is usually achieved using a filament-based toothbrush with a toothpaste consisting of abrasive particles in a carrier fluid. This work has been carried out to examine how these abrasive particles interact with the filaments and cause material removal from a stain layer on the surface of a tooth. It is important to understand this mechanism as while maximum cleaning efficiency is required, this must not be accompanied by damage to the enamel or dentine substrate. In this work simple abrasive scratch tests were used to investigate stain removal mechanism of two abrasive particles commonly used in tooth cleaning, silica and perlite. Silica particles are granular in shape and very different to perlite particles, which are flat and have thicknesses many times smaller than their width. Initially visualisation studies were carried out with perlite particles to study how they are entrained into a filament/counterface contact. Results were compared with previous studies using silica. Reciprocating scratch tests were then run to study how many filaments have a particle trapped at one moment and are involved in the cleaning process. Stain removal tests were then carried out in a similar manner to establish cleaning rates with the two particle types. Perlite particles were found to be less abrasive than silica. This was because of their shape and how they were entrained into the filament contacts and loaded against a counterface. With both particles subsurface damage during stain removal was found to be minimal. A simple model was built to predict stain removal rates with silica particles, which gave results that correlated well with the experimental data.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright (c) 2007 Elsevier Science B.V., Amsterdam. This is an author produced version of a paper published in ' Wear '. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Abrasive particles Stain removal Teeth cleaning Toothbrush Toothpaste Abrasives Cleaning Silica Substrates Stain layer Subsurface damage Dentistry
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)
Depositing User: Mr Christopher Hardwick
Date Deposited: 18 Aug 2009 15:09
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1016/j.wear.2006.12.023
Status: Published
Publisher: Elsevier Science B.V., Amsterdam.
Refereed: Yes
Identification Number: 10.1016/j.wear.2006.12.023
URI: http://eprints.whiterose.ac.uk/id/eprint/9168

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