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OBJECTIVES: The objective of the authors was to evaluate fluoride release of 3 glass ionomer cements with immediate protection of fluoride varnish (Cavitine, SS White), divided into 3 groups: Group M (Meron, VOCO), Group V (Vidrion C, SS White) and Group KC (Ketac-Cem, 3M ESPE). METHODS: Fluoride release was measured during 60 days by means of an ion-selective electrode connected to an ion analyzer. After 4 weeks, the test specimens were exposed to a solution of 0.221% sodium fluoride (1000 ppm of fluoride). RESULTS: Results showed that the cements reached a maximum peak of fluoride release in a period of 24 h. There was a statistically significant difference between the amount of fluoride released after the applications of fluoride among the groups from the 31st to 60th day (p> 0.05). CONCLUSION: The Vidrion C and Meron cements showed better performance to uptake and release fluoride when compared with Ketac-Cem cement.

Introdução: O propósito do presente trabalho é avaliar a liberação de flúor de alginatos de uso odontoló- gico. Materiais e Métodos: Foram avaliadas cinco marcas de alginatos divididos em cinco grupos: Jeltrate, Alga Gel, Printer Gel,Ava Gel e New Print. Os alginatos foram manipulados seguindo as orientações dos fabricantes. Após isso, seguiu-se à confecção dos corpos de prova, utilizando-se moldes de silicone nas dimensões de 4mm de diâmetro e 4mm de altura. Após geleificação, os corpos de prova foram removidos dos moldes e inseridos em recipiente com 10ml de água milliQ, por 2min. A liberação de flúor foi medida, através de eletrodo íon seletivo conectado a um analisador de íons. Resultados: O Ava Gel liberou menor quantidade de flúor e foi diferente estatisticamente dos grupos Alga Gel e New Print (P<0,05). O New Print que liberou mais apresentou similaridade estatística apenas com o grupo Alga Gel que por sua vez foi similar estatisticamente ao Jeltrate e Printer Gel (P> 0.05). Conclusões: Pode-se concluir com a realização deste trabalho que todos os alginatos testados liberaram flúor, um em mais e outros em menor quantidade.