Abstract
A prolonged fluoride application (PFA) method was used to treat susceptible fissures in 210 permanent first molar teeth in 79 children living in a fluoridated community. The development of caries in these fissures was followed for periods ranging from 2 to 4 years. At the final examination, 82.8% of occlusal surfaces in the 2-year group and 8090% of those in the 3-year group were free of detectable lesions. The corresponding value for the 4-year group was 78.9%. The mean number of treatments of these surfaces with the PFA method ranged from 1.6 for the 2-year group to 2.9 for the 4-year group.
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