Universidade de Pernambuco

About: Universidade de Pernambuco is a education organization based out in Recife, Brazil. It is known for research contribution in the topics: Population & Artificial neural network. The organization has 6147 authors who have published 6948 publications receiving 73648 citations.

Physical activity and sedentary behavior among adolescent high school students

Abstract: OBJETIVO: Identificar a prevalencia e fatores associados a nivel insuficiente de pratica de atividades fisicas e exposicao a comportamento sedentario em adolescentes. METODOS: Estudo transversal cuja amostra foi constituida por 4210 estudantes do ensino medio (14-19 anos), selecionados atraves de amostragem por conglomerados em dois estagios. Para coleta de dados foi utilizado o questionario "Global School-based Student Health Survey". Sujeitos que relataram participar de, pelo menos, 60 minutos diarios de atividades fisicas moderadas a vigorosas, durante cinco ou mais dias por semana, foram classificados como ativos, enquanto os demais foram denominados insuficientemente ativos. Foram considerados expostos a comportamento sedentario aqueles que referiram assistir televisao por tres horas ou mais por dia. As analises foram realizadas atraves do teste de Qui-quadrado e de regressao logistica binaria. RESULTADOS: A prevalencia de insuficientemente ativos foi 65,1% (IC95% 63,7-66,6). Identificou-se que sexo, local de residencia (rural/urbano), turno de aulas, status ocupacional e participacao nas aulas de educacao fisica foram fatores associados a nivel insuficiente de atividade fisica. Verificou-se prevalencia de exposicao a comportamento sedentario de 40,9% (IC95% 39,4-42,4) em dias de semana e de 49,9% (IC95% 48,4-51,4) em dias de final de semana. Local de residencia, turno de aulas, status ocupacional e participacao nas aulas de educacao fisica foram fatores associados a exposicao a comportamento sedentario em dias de semana; enquanto sexo, faixa etaria e turno de aulas discriminaram a exposicao nos dias de final de semana. CONCLUSAO: Este estudo evidenciou elevada prevalencia de niveis insuficientes de atividade fisica e de exposicao a comportamento sedentario.

Efficacy of a novel at-home bleaching technique with carbamide peroxides modified by CPP-ACP and its effect on the microhardness of bleached enamel

Abstract: This study was designed to evaluate in vitro the efficacy of a novel at-home bleaching technique using 10% or 16% carbamide peroxide modified by casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) and its influence on the microhardness of bleached enamel. A total of 40 bovine incisors were divided into four groups (n=10) according to the bleaching agent used: 10% carbamide peroxide only; a blend of 10% carbamide peroxide and a CPP-ACP paste; 16% carbamide peroxide only; and a blend of 16% carbamide peroxide and a CPP-ACP paste. During the 14-day bleaching regimen, the samples were stored in artificial saliva. The Vickers microhardness and color of the teeth were assessed at baseline (T0) and immediately after the bleaching regimen (T14) using a microhardness tester and a spectrophotometer, respectively. The degree of color change was determined by the Commission Internationale de l'Eclariage (CIE) L*a*b* system (ΔE, ΔL*, Δa*, and Δb*) and Vita shade guide parameters. The data were analyzed by analysis of variance and the Tukey test (p<0.05). The teeth that were bleached with a blend of peroxide (10% or 16%) and the CPP-ACP paste presented increased microhardness values at T14 compared with T0, whereas the samples that were bleached with peroxide only did not show any differences in their microhardness values. All of the bleaching agents were effective at whitening the teeth and did not show a statistically significant difference using the CIEL*a*b* system (ΔE, ΔL*, Δa*, and Δb*) or the Vita shade guide parameters. The use of a CPP-ACP paste with carbamide peroxide bleaching agents increased the bleached enamel's microhardness and did not have an influence on whitening efficacy.

Biocompatibility of resin-based dental materials applied as liners in deep cavities prepared in human teeth

Abstract: Araraquara School of Dentistry University of Sao Paulo State-UNESP, Rua Humaita, 1680 CEP: 14.801-903, Araraquara, SP