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Effect of Fluoride on Mechanical Properties of Teeth Demineralized by Use of Orthodontic Appliances

Published online by Cambridge University Press:  01 February 2011

Claudia Centeno ,
Ulises Ruiz ,
Oscar Contreras  and
Enrique C. Samano
Claudia Centeno
Affiliation:
Facultad de Odontología, UAEM, Toluca, Mex, México
Ulises Ruiz
Affiliation:
Facultad de Odontología, UAEM, Toluca, Mex, México
Oscar Contreras
Affiliation:
CCMC-UNAM, Ensenada, BC, México
Enrique C. Samano
Affiliation:
CCMC-UNAM, Ensenada, BC, México
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Abstract

The risk of dental caries increases with the use of orthodontic appliances, and it does not only depend on a patient's oral hygiene. Caries cause teeth enamel demineralization close to the orthodontic bracket. The hardness of the teeth consequently decreases, and they become brittle and loose. The type of adhesive used to fix brackets may or may not reduce enamel demineralization. Previous studies have shown that a resin-modified glass ionomer (RMGI) inhibits demineralization. The purpose of this work is to evaluate the effect of a fluoride-releasing bracket on mechanical properties of dentin and enamel on regions adjacent to orthodontic brackets bonded with RMGI and composite resin cements. The remineralization effect due to fluoride on teeth was assessed by measuring hardness and reduced elastic modulus on dentin, enamel and dentin-enamel junction (DEJ) around the bracket area by nanoindentation methods. Nanoindentation was performed using a TriboScope from Hysitron. For this purpose two sets of polished samples were prepared: one sample was a cut along a longitudinal section and the other one along a cross-section of a tooth with orthodontic treatment using RMGI. Anisotropy in the mechanical properties of the teeth is observed along each direction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 844: Symposium Y – Mechanical Properties of Bio-Inspired and Biological Materials , 2004 , Y3.3/R3.3
Copyright
Copyright © Materials Research Society 2005

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