Abstract: ObjectiveTo compare the clinical effect of light-cured flowable resin and traditional light-cured pit and fissure sealant in preventing pit and fissure caries.Methods150 children aged from 7 to 10 years with healthy permanent mandibular first molars were enrolled in this study. One side of permanent mandibular first molar was selected randomly as experimental group, which was sealed with light-cured flowable resin. The other side, as control group, was treated with traditional light-cured pit and fissure sealant. Patients were followed up 6, 12 and 24 months later. The rate of resin loss and incidence of dental caries between two groups were compared by Chi—square test. Results After two years, the rate of sealant loss and the incidence of caries of experimental group (7.8%; 2.13%) were significantly lower than those of the control group(21.43%; 7.09%) (P<0.05).Conclusion Light-cured flowable resin is an effectively anticarious and reliable pit and fissure sealant.

Key words: light-cured flowable resin, the permanent first molar, pit and fissure sealant, incidence of dental caries