PURPOSE: To determine whether family income, age and educational level of the mother of the family are associated with self-reported use of dental floss over a 13-year period in a city in southern Brazil. MATERIALS AND METHODS: A comparison of two household surveys was carried out where mothers of the family were interviewed using a structured questionnaire in order to obtain demographic, behavioural and socioeconomic information. In total, 852 and 984 households were included in 1996 and 2009, respectively. Self-reported use of dental floss was assessed dichotomously (yes/no). Poisson regression models were fitted to study the association between sociodemographic variables with the use of dental floss. Proportion ratios (PR) and 95% confidence intervals (95% CI) were reported. RESULTS: The proportion of dental floss use increased from 48% to 59% over 13 years. The probability of dental floss use increased 1.23 times from 1996 to 2009 (PR = 1.23; 95% CI 1.13-1.34). Households with mothers >/=50 years old presented a 28% lower probability of using dental floss than households with mothers

O presente artigo pretende inserir o teólogo franciscano Geraldo Odon (ca. 1290-1349) no debate historiográfico medieval acerca das diferentes solções oferecidas ao célebre paradoxo do mentiroso. Na primeira parte a autora apresenta rapidamente e de forma esquemática os principais tipos de solução ao sofisma para em seguida analisar o texto de Odon, respondendo à questão da sua originalidade.