2[2]WHO.Oral Health Surveys- basic methods. The 3rdedition. 1987.Geneva.
3[3]Kinnby CG, Palm L, Widenheim J. evaluation of information on dental health care at child health centres. Differences in educational level,attitudes and knowledge among parents of preschool children with different caries experience. Acta odontol scand, 199149(5) :289～95.
4[5]Peternen PE. Esheng Z. dental caries and oral health behaviour situation of children, mothers and school teachers in W uhan, People's Republic Of China, lnt ,dent ,J. 1998,48(3) :210 ～6.
5[6]Pilot T. Barmes DE, Leclercq MH. Mccombie BJ, Sardo lnfirri J:Periodontal conditions in adolescents. 15 ～ 19 years of age: an overview of CPITN data in the WHO global oral data band.Community dot oral epidemiol 1987, (15 ) :376～ 8.
6[7]Y. Li,JM Navia % JY Bian. Caries experience in deciduous dutition of rural Chinese children 3 ～ 5 years old in relation to the presence or absence of enamel hypoplasia. Caries Res, 1996, (30) :8 ～ 15.
4Peres MA, de Oliveira Latorre Mdo R, Sheiham A, et al. Social and biological early life influence on severity of dental caries in children aged 6 years [ J ]. Community Dent Oral Epidemiol, 2005,33 ( 1 ) :53 - 63.
5Sanpei S, Endo T, Shim ooka S. Caries risk factors in children under treatment with sectional brackets [ J ]. Angle 0 rthod, 2010,80( 1 ) :509 -514.
