Maruthamuthu, S. and Rajasekar, A. and Sathiyanarayanan, S. and Muthukumar, N. and Palaniswamy, N.
(2005)
Electrochemical behaviour of microbes on
orthodontic wires.
Current Science, 89 (6).
pp. 988-996.
Abstract
The aim of the present study is to investigate the electrochemical
behaviour of orthodontic wires in artificial
saliva with and without bacteria. Four factors were
considered to characterize the bacteria present in the
saliva, viz. urban and rural groups of vegetarians and
non-vegetarians. The results showed that among the
heterotrophic bacterial isolates, Gram-positive species
dominated over the Gram-negative species in the ratio
of 4 : 1. The samples also confirmed the presence of
sulphate reducing bacteria. Moreover, chemolithotrophs
like manganese and iron oxidizing bacteria and
acid producing bacteria were isolated and identified in
the saliva. The bacterial strains were isolated and
identified based on their morphological, physiological
and biochemical characterstics. Nesseria sicca, Eikenella
corrodens, Pseudomonas sp., Escherichia coli,
Wolinella sp., Campylobacter sp., Kurthia sp., Lactobacillus
acidophilus, Rothia dentocariosa, Streptococcus
salivarius, Arachnia propionica, Stomatococcus mucilogenosus,
Staphylococcus epidermidis, Bacillus cereus,
Bacillus subtilis, Micrococcus roseus, Corynebacterium
maturochotii, Brocothrix sp., Listeria sp., Staphylococcus
sp., Gallionella sp., Legionella sp., and Thiobacillus sp.
were noticed in the saliva. Polarization and impedance
studies were carried out for orthodontic wires, investigating
the electrochemical behaviour of stainless steel in
the presence of microbes. On the basis of electrochemical
investigations, it was concluded that NiTi-0.016
and SS-26 gauge were better candidate material for
dental applications.
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