Resumen
ABSTRACT Objective:This study investigates the association between the prevalence and severity of dental fluorosis, the socio-economic status (SES) and area of residence among 12-year-old school children in Uruguay. Material and methods:The study was descriptive, cross-sectional, explanatory and observational. Subjects considered eligible were born in 1999 and had their parents’ or guardian’s prior consent. A questionnaire was used to identify SES according to Centro de Investigaciones Econ omicas Institute on four levels. Dental fluorosis was determined using the Thylstrup–Fejerskov (TF) index. Results:Of the 1544 students examined, 45.0% showed dental fluorosis. A TF index 1–2 was recorded in 29.3% of the subjects, TF 3 in 20.9%, TF 4 in 6.7% and TF 5–9 in 2.1%. In area 1 (the capital Montevideo city), 84.8% of the subjects had dental fluorosis, a value that was significantly higher than in the inland region (area 2, 24.4%) and border departments (area 3, 22.5%) (x 2 ¼27.92,p
