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A 30-month longitudinal study of the effects of some oral hygiene measures on Streptococcus mutans and approximal dental caries . The effects of some oral hygiene measures on Streptococcus mutants and approximal dental caries were evaluated . One hundred and eighty-seven 13-year-old individuals with high levels of salivary S. mutans ( greater than 10 ( 6 ) /mL ) were selected . They were randomly distributed into three groups . Group I initially received professional mechanical tooth-cleaning , 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 I . 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 an 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 approximally/year , 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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Intervention_Physical
oral hygiene measures
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Intervention_Physical
oral hygiene measures
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Intervention_Physical
professional mechanical tooth-cleaning
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Intervention_Physical
tongue-scraping
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Intervention_Other
,
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Intervention_Control
chlorhexidine treatment
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Intervention_Educational
oral hygiene instructions
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Intervention_Educational
oral hygiene instructions
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Intervention_Educational
preventive program provided by the local Dental Health Office
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Intervention_Physical
mechanical plaque control
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Intervention_Pharmacological
topical use of fluorides and chlorhexidine
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Outcome_Physical
Streptococcus mutans and approximal dental caries
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Outcome_Physical
Streptococcus mutants
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Outcome_Physical
approximal dental caries
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Outcome_Physical
S. mutans
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Outcome_Physical
caries progression
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Outcome_Physical
mutans levels
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Outcome_Physical
new or progressive caries