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Journal of Dental Research
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Clinical

A Longitudinal Study of Streptococcus mutans Colonization in Infants after Tooth Eruption

A.K.L. Wan1, W.K. Seow1,*, D.M. Purdie2, P.S. Bird3, L.J. Walsh1 and D.I. Tudehope4

1 University of Queensland, School of Dentistry, 200 Turbot Street, Brisbane, Queensland 4000, Australia;
2 Queensland Institute of Medical Research, Population & Clinical Sciences Division, Herston Rd., Brisbane, Queensland 4006, Australia;
3 Oral Biology Laboratory, University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia; and
4 Mater Misericordiae Hospitals, Raymond Tce., South Brisbane, Queensland 4105, Australia;

Correspondence: *corresponding author, k.seow{at}uq.edu.au

We previously reported that, before tooth eruption, over one-half of infants aged 6 mos were already infected with Streptococcus mutans. The aim of this investigation was to determine the colonization of S. mutans after tooth eruption in the same cohort of 111 infants (35 pre-term, 76 full-term). Our results showed that S. mutans colonization increased with increasing age, so that by 24 mos of age, 84% harbored the bacteria (p < 0.01). The mean and median ages of S. mutans colonization in dentate infants were 15.7 mos and 16.0 mos, respectively. Factors associated with S. mutans colonization were sweetened fluids taken to bed (p < 0.01), frequent sugar exposure (p < 0.03) and snacking (p < 0.03), sharing of foods with adults (p < 0.03), and maternal S. mutans levels of > 105 CFU/mL (p < 0.02). In contrast, non-colonization of S. mutans was associated with toothbrushing (p < 0.03) and multiple courses of antibiotics (p < 0.001). Analysis of our data establishes the timing of S. mutans colonization in children from birth to 24 mos of age.

Key Words: Streptococcus mutans • pre-term • full-term • oral colonization

Journal of Dental Research, Vol. 82, No. 7, 504-508 (2003)
DOI: 10.1177/154405910308200703
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