Study On The Effect Of Caries Prevention And Microleakage Of Two Different Fluoride-containing Pit And Fissure Sealants

Backgrond Caries disease is one of the most common oral diseases. Accordingto the third national oral epidemiology investigation，it shows that: The caries rate of12years old children in China was28.9%,and about90%of the caries occurred in denditch point gap area. Pit and fissure sealant (pit and fissure sealant, PFS) is recognizedas a scholars both at home and abroad to prevent caries tooth socket channel point gap,the most effective ways to the success or failure of the technology is closely related tothe litter of channel blocker material performance.The effect of fluoride has been confirmed by a lot of researches and allpreparations have been widely used. Fluoride-containing pit and fissure sealants as4th generation sealant which effectively combines fluoride and tradition pit andfissure sealants,not only has protective barrier of the traditional pit and fissuresealants of tooth surface litter gap,and by fluorine ions releasing slowly to the oralenvironment，with the pit and fissure sealants of surface of adjacent teeth,also has thepotential of their effect.At present the study of fluoride-containing pit and fissure sealants is small in ourcountry. If glass ionic materials could used in clinical as pit and fissure sealants, couldreduce the incidence of tooth decay, could have better retention and microleakage,allthese problems remains to be further explored.The purpose of this study is adopted to improve the two clinical comparativestudy of fluoride-containing pit and fissure sealants,mainly for children aged6~8ofthe first permanent molar on randomized controlled method. In additional,to observeand to compare microleakage of two fluoride-containing pit and fissure sealants in theartificial saliva in vitro,for clinical promotion using fluoride-containing pit and fissuresealants especially glass ionomers to provide certain theoretical basis.Results Resin containing fluorine sealants totally loss rate, partial loss rate, were significantly lower than the glass ionic fluoride sealer and all retention rate wassignificantly higher than the latter for3months,6months,12months (p<0.001).Resin containing fluorine sealants for caries rate is lower than a year ionic fluorideglass sealants (p<0.05). Microleakage results between two kinds of sealants inWilcoxon Mann-Whitney test rank and inspection, p=0.000,shows significantdifference(p<0.001).Conclusion①The two fluoride-containing pit and fissure sealants both havegood effects of prevention of dental caries and the off rate of resin fluoride-containingpit and fissure sealants is lower than glass ionic fluoride sealants.②Retention rate hasa certain relationship with litter depth. Nest in the ditch, gully than shallow nest deepnest better retention rate.③Glass ionic sealants have lower cost-effectiveness andused easily.④Two fluoride-containing pit and fissure sealants both have differentdegree of penetration.The microleakage level of resin fluoride-containing pit andfissure sealants is less than glass ionomers sealants.