Association between Enamel Hypoplasia and Dental Caries in Primary Second Molars: A Cohort StudyHong L.a · Levy S.M.b, c · Warren J.J.b · Broffitt B.b
aDepartment of Dental Public Health and Behavioral Science, School of Dentistry, University of Missouri- Kansas City, Kansas City, Mo.; bDepartment of Preventive and Community Dentistry, College of Dentistry, and cDepartment of Epidemiology, College of Public Health, University of Iowa, Iowa City, Iowa, USA
Department of Dental Public Health, 396A School of Dentistry
University of Missouri-Kansas City, 650 East 25th Street
Kansas City, MO 64108-2784 (USA)
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The purpose of this study was to assess the longitudinal relationships between enamel hypoplasia and caries experience of primary second molars. The study sample was 491 subjects who received dental examinations at both age 5 and 9 by the calibrated examiners. Four primary second molars (n = 1,892) were scored for the presence of enamel hypoplasia for each participant. Caries presence and number of decayed and filled surfaces (dfs) were determined at age 5 and 9. The relationships between enamel hypoplasia and caries experience were assessed. Among primary second molars, 3.9% of children and 1.7% of primary second molars had enamel hypoplasia. At age 5, 36.8% of children with hypoplasia had caries, while 16.9% of children without enamel hypoplasia had caries. At age 9, the corresponding numbers were 52.6% for children with hypoplasia and 34.5% for children without hypoplasia, respectively. At the tooth level, for age 5, 28.1% of teeth with hypoplasia had caries (mean dfs = 0.40), and 7.6% of teeth without hypoplasia had caries (mean dfs = 0.11). At age 9, the corresponding numbers were 41.9% (mean dfs = 0.76) for teeth with hypoplasia and 18.3% (mean dfs = 0.34) for teeth without hypoplasia. In multivariable logistic regression analyses, teeth of subjects with enamel hypoplasia had a significantly higher risk for caries at age 5 and 9 after controlling for other risk factors. Enamel hypoplasia appears to be a significant risk factor for caries and should be considered in caries risk assessment.
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