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Effect of Streptococcus mutans on mechanical properties of human dental structures

Published online by Cambridge University Press:  31 January 2011

Shou-Yi Chang ,
Ren-Jei Chung ,
Fang-Cheng Chou ,
Hsiang-Long Hsiao  and
Hung-Bin Hsu
Shou-Yi Chang*
Affiliation:
Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
Ren-Jei Chung
Affiliation:
Graduate Institute of Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan
Hung-Bin Hsu
Affiliation:
Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
*
a) Address all correspondence to this author. e-mail: shouyi@dragon.nchu.edu.tw
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Abstract

In this study, the mechanical properties of human dental structures have been investigated by using instrumented nanoindentation. Immersion in solutions containing Streptococcus mutans, which is the principal cause of dental caries, was applied to tooth specimens to clarify its effect on the microstructure and mechanical properties of the dental structures. With an extended time of up to 16 h, the pH value of the S. mutans solutions dropped from 7.3 to 5.8. Therefore, after immersion in the S. mutans solutions for 16 h, slight erosions of the dental structures began; after 64 h, severe tooth decay occurred with obviously etched dental features. After 128 h, the elastic modulus of enamel and dentine dropped to 85 and 67%, respectively, of the original values of untreated specimens, and the hardness dropped to 88 and 55%, respectively.

Keywords

BiomaterialHardnessNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2301 - 2306
Copyright
Copyright © Materials Research Society 2009

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