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Resumo: O projeto Integra -Ação Sorriso é desenvolvido por graduandos e mestrandos em Odontologia -UEL/PR com o objetivo de promover atendimento odontológico em crianças e adolescentes em situação de vulnerabilidade social, atendidas pela Instituição Casa Acolhedora Mãe e Senhora de Todos os Povos, Londrina-PR, e instruir quanto à prevenção de doenças e promoção de saúde, principalmente a saúde bucal. Os alunos promoveram ações culturais e educativas com 85 crianças e familiares, incluindo atendimento odontológico, instrução de higiene bucal e fornecimento de material de higiene bucal. Foram oferecidas também orientações por oficinas sobre saúde bucal, instrução quanto à gravidez na adolescência e doenças sexualmente transmissíveis, alimentação saudável, tabagismo e traumatismo dentário. Também foram desenvolvias atividades educativas e culturais, como o Trote Solidário dos calouros do Curso de Odontologia e comemoração de datas festivas, chamando a atenção para a temática de saúde, além de arrecadação de material escolar e brinquedos. A integração de alunos com a comunidade permitiu a formação de profissionais capacitados para atuar em prevenção e conscientes de seu papel na atenção às demandas sociais. Foi possível ainda perceber a necessidade de estender o atendimento odontológico para atendimento aos pais, devido ao progresso dos tratamentos das crianças e adolescentes.Palavras chave: Extensão comunitária; cárie dentária; crianças; prevenção; saúde coletiva. Abstract: The 'Integra' project -Smile Action is developed by undergraduate and Master's degree students in Dentistry -UEL/PR with the objective of promoting dental care for children in situation of social vulnerability assisted by the institution Casa Acolhedora Mãe e Senhora de Todos os Povos-Londrina-PR. The students promoted cultural and educational actions with 85 children and their families, including dental care, oral hygiene instruction and supply of oral hygiene materials. Workshops were organized addressing oral health, pregnancy and sexually transmitted diseases, diet, smoking and dental trauma. The students developed educational and cultural activities, such as the Solidarity campaign at the beginning of the school semester and celebration of festive dates with the purpose of drawing attention to health lifestyle and collecting school material and toys. The integration of undergraduate and graduate students with the community allowed the training of professionals in prevention and raised awareness of their role in addressing social demands. It was also possible to identify that it is necessary to extend dental care to parents, due to the progress of children's and adolescents' treatments.

Aim: To evaluate if gypsum mixed with different water types, with their different compositions influence the dimensional change, surface roughness and compressive strength of type IV and V gypsum specimens. Methods: Sixty specimens were fabricated from metal matrices and divided into six groups (n=10) according to the used type of gypsum and water: G1, G2 and G3 -type IV gypsum and tap, mineral and distilled water, respectively; G4, G5 and G6 -type V gypsum and tap, mineral and distilled water, respectively. Water/powder ratio followed the manufacturer's recommendations (19 mL/100 g) in all groups. The same specimens were used for all tests. A micrometer dial evaluated the dimensional change. The surface roughness of three random points was determined with a rugosimeter; a universal testing machine performed the compressive strength test. The data were subjected to analysis of variance (ANOVA). Results: There was no statistically significant difference (p>0.05) between the three types of water in the studied variables. There was statistically significant difference (p<0.05) between the gypsum mixes for the dimensional change variable. Conclusions: The different water types, with their different compositions, did not influence the analyzed physical and mechanical properties.