The thermocycling was concluded as being able to change composite resins' surface roughness, whereas different finishing and polishing methods did not result in surface roughness changes after thermocycling.

The composition of material, including the type of organic matrix, could be more relevant to roughness maintenance over time than the general behavior of composites based on particles fillers. The maintenance of smooth surface in resin-based composite restorations is totally dependent of organic composition of the material.

The aim of the study was to evaluate the effect of erosive pH cycling with solutions that simulate dental erosion on Martens hardness (HMV) and elastic modulus (Eit) of dentin restored with fluoride-releasing adhesive systems. Twenty-seven bovine dentin slabs were restored with three adhesive systems: Adper Single Bond 2 total-etch adhesive system, One Up Bond F and Clearfil SE Protect fluoride-containing self-etching adhesive systems. The restorations were made with Filtek Z250. The HMV and Eit values at distances of 10, 30, 50 and 70 µm from the interface were evaluated using a dynamic ultra microhardness tester before and after immersion in deionized water, citric acid and hydrochloric acid (n=9). Data were submitted to repeated-measures ANOVA and Fisher's PLSD tests (=0.05). After erosive cycling, HMV values of dentin decreased in all groups. For dentin restored with Adper Single Bond 2, the lowest values were found closer to the hybrid layer, while for One Up Bond F and Clearfil SE Protect, the values remained unaltered at all distances. For dentin restored with fluoride-releasing adhesive systems, a decrease in Eit was found, but after 30 µm this difference was not significant. The acid substances were able to alter HMV and Eit of the underlying dentin. For fluoride-releasing adhesives, the greater the distance from bonded interface, the lower the Eit values. The fluoride in One Up Bond F and Clearfil SE Protect was able to protect the underlying dentin closer to the materials. In this way, the fluoride from adhesive systems could have some positive effect in the early stages of erosive lesions.

No abstract

Objetivo: analisar a aptidão, o conhecimento e a atitude de profissionais da educação infantil que participaram ou não de capacitação em primeiros socorros. Método: estudo descritivo, transversal, quantitativo, desenvolvido com 132 profissionais da educação infantil do município de Três Lagoas, entre os dias 20 a 30 de setembro de 2020. Coletaram-se os dados no Google forms. Aplicaram-se os testes qui-quadrado ou Exato de Fisher. Resultados: a maioria dos participantes não participou de capacitação em primeiros socorros, e não se sente apta a prestar atendimento em situações de emergência. O grupo que participou de capacitação acertou mais respostas referentes ao conhecimento dos conceitos de febre, convulsão, desmaio, trauma, parada cardiorrespiratória e acidente por animal peçonhento; e referente às atitudes para convulsão, desmaio, engasgo, queda/trauma e parada cardiorrespiratória. Conclusão: participar de uma capacitação proporcionou aos profissionais um maior conhecimento e assertividade referente à atitude que deve ser tomada nas situações de emergência.