The association between PD and PLBW weight was consistent, except for exposure measurement 1, i.e. using at least one site with CAL> or =3 mm for periodontitis diagnosis, while the magnitude of this varied according to the definition established.

RESUMOSobrepeso e obesidade infantil apresentam prevalência elevada e caráter multifatorial. Com o objetivo de determinar a influência de fatores biológicos e ambientais no seu desenvolvimento, foi realizado corte transversal com 699 crianças, de 5 a 9 anos, da rede de ensino público e privado da zona urbana de Feira de Santana, BA. Sobrepeso e obesidade foram definidos como índice de massa corpórea ≥ aos percentis 85 e 95 para idade e sexo, respectivamente. A análise de entrevistas com os responsáveis determinou a influência dos fatores em questão. Observados como de significância estatística para o desenvolvimento de ambas as condições: nível elevado de escolaridade e renda familiar, ser unigênito, freqüentar escola privada, possuir eletrodomésticos e utilizar computador. O grupo étnico branco relacionouse apenas ao sobrepeso. Repetência escolar e realização de atividade física sistemática mostraram associação inversa. O odds ratio mostrou associação preditiva independente com o fato de estudar em escola privada e ser unigênito. Em conclusão, há influência de fatores biológi-cos e ambientais no desenvolvimento de sobrepeso e obesidade infantil, confirmando o caráter multifatorial. Childhood overweight and obesity have a high prevalence and multifactorial character. To determine the influence of biological and environmental factors in their development, a cross-sectional study was performed with 699 children, ranging from 5 to 9 years of age, from the public and private schools in the urban area of Feira de Santana, BA. Overweight and obesity were defined as body-mass index ≥ the 85 th and 95 th percentiles for age and gender, respectively. Interviews with the children's responsible were used to determine the influence of these factors. It was observed as statistic significance for the development of both conditions: high level of parent's education and income, being an only child, studying at private school, having household appliances and using computers. The white ethnic group was related only to overweight. There was an inverse association regarding school flunking and practice of systematic physical activity. The odds ratio showed a predictive and independent association with studying at private school and being an only child. In conclusion there was an influence of biological and environmental factors in the development of childhood overweight and obesity, confirming the multifactorial etiology of these conditions.

These results indicate that X-ray radiation emitted during panoramic dental radiography induces a genotoxic effect on epithelial gingival cells that increases the frequency of chromosomal damage and nuclear alterations indicative of apoptosis.

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The findings suggest an association between periodontal disease and low birth weight among mothers with low education levels.