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Journal of Dental Research
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A 30-month Longitudinal Study of the Effects of Some Oral Hygiene Measures on Streptococcus mutans and Approximal Dental Caries

P. Axelsson

Department of Preventive Dentistry, Public Dental Health Service, Alvg. 47, S-652 30 Karlstad, Sweden

K. Kristoffersson

Department of Cariology, School of Dentistry, University of Lund, Carl Gustafs v. 34, S-214 21 Malmö, Sweden

R. Karlsson

Department of Preventive Dentistry, Public Dental Health Service, Alvg. 47, S-652 30 Karlstad, Sweden

D. Bratthall

Department of Cariology, School of Dentistry, University of Lund, Carl Gustafs v. 34, S-214 21 Malmö, Sweden

The effects of some oral hygiene measures on Streptococcus mutans and approximal dental caries were evaluated. One hundred and eighty-seven 13-year-old individuals with high levels of salivary S. mutans (>106/mL) were selected. They were randomly distributed into three groups. Group I initially received professional mechanical toothcleaning, tongue-scraping, chlorhexidine treatment, and oral hygiene instructions concentrated on the approximal surfaces most colonized by S. mutans. The treatment was given four times with intervals of two days, followed by one single treatment every six months throughout the experimental period. The initial treatment period for group II, also consisting of four visits, included the same oral hygiene instructions as for group 1. The instructions were repeated every six months. Group III was maintained in the preventive program provided by the local Dental Health Office, based on mechanical plaque control and topical use of fluorides and chlorhexidine at individualized intervals. Group I showed a significant immediate reduction of S. mutans in saliva as well as on approximal tooth surfaces. After six months, there were no differences among the three groups regarding these variables. Compared with baseline, there was a significant reduction of S. mutans in all groups. There was no significant difference in caries progression among the three groups. However, the selected "high-risk" individuals in group I developed 0.25 new manifest caries lesions approximallylyear, compared with 0.27 for all children of the same age group in the area. Seventeen individuals had approximal surfaces with consistently high or consistently low S. mutans levels. Forty-six percent of the surfaces with high values developed new or progressive caries, compared with 2% of the surfaces with low values.

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Journal of Dental Research, Vol. 66, No. 3, 761-765 (1987)
DOI: 10.1177/00220345870660031101
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