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Mutans Streptococci, Oral Hygiene, and Caries in an Adult Swedish Population

Department of Periodontology and Oral Medicine, N.Älvsborg County Hospital, The Vänersborg Clinics, Box 760, S-462 26 Vänersborg, Sweden

L. Allander

Department of Cariology, University of Lund, Malmö, Sweden

D. Bratthall

Department of Cariology, University of Lund, Malmö, Sweden

L. Hellden

Department of Periodontology and Oral Medicine, N.Älvsborg County Hospital, The Vänersborg Clinics, Box 760, S-462 26 Vänersborg, Sweden

The objective of the present study was to describe the distribution of salivary mutans streptococci in a randomly selected adult population and to relate the distribution to the prevalence of caries. The aim was also to study the association between caries and different levels of oral hygiene (OH). The results were based on the assessment of caries, dental plaque, and concentration of salivary mutans streptococci in 914 subjects who represented 95% of an age- and gender-stratified population sample of 967 individuals, randomly selected from the total adult population living in Alvsborg County, Sweden. The results showed that the distribution of mutans streptococci among dentate adults not wearing any kind of removable denture(s) was similar to that previously reported from studies on Swedish schoolchildren, while a comparably higher proportion of subjects with high levels of mutans streptococci was found among the dentate individuals wearing some kind of removable denture(s). Even higher proportions were found among edentulous individuals with complete denture(s). There was a correlation between mutans streptococci concentration in saliva and caries. The subjects with lower concentrations showed a significantly lower mean number of decayed surfaces, compared with the individuals with higher concentrations of mutans streptococci in their saliva.

The median OH standard was lower in the older age groups, and there was a higher ratio of decayed surfaces per remaining tooth in those age groups, in comparison with the younger groups. However, for individuals without mutans streptococci, no relation between OH standard and caries could be found and, regardless of OH standard, higher numbers of decayed surfaces were found with an increasing concentration of mutans streptococci in saliva.

Journal of Dental Research, Vol. 69, No. 8, 1469-1475 (1990)
DOI: 10.1177/00220345900690080401


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