[The observation of the contained fluoride sealant on caries prevention for 3 years]

Pit and fissure sealant is an effective method for preventing pit and fissure caries,though it has less effect in smooth surface teeth.But the contained sealant is effective on caries prevention both in pit and fissure area and in smooth surface.The aim of the present search was observing the clinic results of the contained fluoride sealant on caries prevention.786 children aged 6-8 years old were divided into four groups.The first permanent molars in group 1 were sealed by the contained fluoride sealant and those in group 2 were used the conventional sealant.The same molars in group 3 were used the conventional sealant plus the APFI gel and those in group 4 were only used the APFI gel.APFI gel was used one time per half year.The results showed the caries preventive effect of the contained fluoride sealant was significant higher than the conventional sealant or the APFI gel in first molars which had been sealed for three years.The caries incidence of the unsealed teeth in group 1 was lower than that in the other groups.The results also indicated the caries preventive effect of all above methods was less in female than in male.