小学学童におけるフッ化物洗口法による17年間のう蝕予防効果

抄録

In 1970 a weekly fluoride mouthrinsing program using 0.2% neutral NaF solution was initiated in the elementary schools of Yahiko District, Niigata Prefecture, Japan (F<0.1ppm in drinking water). The same program was started at the juniour high school in 1973 and a daily fluoride mouthrinsing program was started in 1978 at all four nurseries in the district. Therefore at present, such programs start at the nursery school level and continue to the 3rd grade in the junior high school within an individual school system.
We investigated the benefits to the permanent teeth from this 17-year school-based fluoride mouthrinsing program. This report presents the effects of ongoing supervised fluoride mouth rinsing program on caries prevalence of permanent teeth according to the age of starting the fluoride mouthrinsing program.
A baseline examination for schoolchildren in 1st-6th grades was conducted in 1970, before the mouthrinsing program began. An examination conducted in 1978 presents the data of children who participated in the program since their entrance into the elementary school, that is, at the age of 6. An examination conducted in 1987 presents the data of children who participated in the program since the age of 4 in the nursery schools.
The DMF person rate in all grades decreased from 72.8% in 1970 to 41.6% in 1978 and 27.6% in 1987.
The DMFT-index in all grades decreased from 2.27 in 1970 to 1.39 in 1978 and to 0.48 in 1987. The differences in caries prevalence were 38.8% and 78.9%, respectively, and were statistically significant (p<0.001).
The school-based fluoride mouthrinsing program produced high caries-preventive effects. Especially, the program started from the nursery level provided higher caries prevention when the 1st molar teeth erupted.
The younger the children were when they entered the program, the longer that they rinsed, the greater were the accumulated benefits.