1[1]Takeuchi K, Nakagaki H, Toyama Y,et al. Fluoride concentrations and distrib ution in Premdars of children from low and optimal Fluoride areas [J]. Caries Res,1996;30:76.
2[2]Ripa LW. An evaluation of the use of professional topica l fluorides [J]. J Dent Res,1990,69:786
3[3]Harold D, Gilbert RJ. The effectiveness of an Amine fluo ride/Stannous fluoride dentifrice on the gingival health of teenagers:results af ter 6 months [J]. International Dental Journal,1996,46:340
4[4]Kunzel W, Fischer T. Rise and fall of caries prevalence in German towns with different F concentrations in drinking water [J]. Caries Res,1997,31:166
5[5]Lagenweij MD, Lukantsova L, Stookey GK. The effect of fl uoride treament timi ng on reminralization of bacteria-induced enamel lesions [J]. Caries Res,1998 ,32:282
6[6]White DG, Nancollas GH. Physical and chemical con siderations of the role of fi rmly and loosely bound fluoride in caries prevention [J]. J Dent Res, 1990,6 9:587
7[7]Daschner H, Uchtmann H, Dusehner HA. Primary reactions of fluoride with outmost layers of enamels [J]. J Dent Res,1990,69:825
8[8]Takenchi K. Fluoride concentration and distribution in p remolars of children f rom low and optimal fluoride areas [J]. Caries Res ,1996,30:76
9[9]Antilla A. Proton-induced X-ray emission analysis of Zn, Sr and Pb in human to oth enamel and its relationship to dental caries [J]. Arch Oral Biol,1986,31( 2):723
10[10]Colly KL, Delanhe G, Comans D. A Comparision of the in fluence of bovine enamel in vitro [J]. J Dent Res,1990,69(2):458
