Prevalence and extent of dental caries, dental fluorosis, and developmental enamel defects in Lithuanian teenage populations with different fluoride exposures.

The aim of this study was to describe the pattern of dental caries, dental fluorosis, and developmental defects of non-fluoride origin in Lithuanian children born and raised in regions with 1.1 ppm (1.1 mg/l F) and 0.3 ppm (0.3 mg/l F) water fluoride levels, respectively. All permanent surfaces/teeth of 300 teenagers were examined for dental caries, dental fluorosis, and non-fluoride developmental defects. The caries prevalence of the study population was 100%. The mean number of decayed surfaces (DS) differed only slightly and statistically insignificantly between the '1.1 ppm fluoride' and '0.3 ppm fluoride' groups (19.6 and 18.1, respectively). However, a greater number of inactive lesions and fewer fillings were found in the '1.1 ppm fluoride' group than in the '0.3 ppm fluoride' group (mean difference 1.18 and -2.80, respectively). The prevalence of dental fluorosis was 45% and 21%, respectively; the prevalence of non-fluoride opacities was 8% and 19%, respectively; and the prevalence of hypoplasia was 12% and 16%, respectively, in the '1.1 ppm fluoride' and '0.3 ppm fluoride' groups. Higher caries levels were noted in children with no fluorosis compared to those with fluorosis recorded (mean DS difference, 3.43). The results lend support to the hypothesis that the presence of fluoride in the oral environment promotes lesion arrest rather than inhibiting the initiation of new lesions.