Abstract

SANTOS, Rogério Lacerda; SAMPAIO, Gêisa Aiane de Morais; PITHON, Matheus Melo  and  VAITSMAN, Delmo Santiago. Fluoride release from orthodontic composites: in vitro study. RGO, Rev. gaúch. odontol. (Online) [online]. 2012, vol.60, n.4, pp. 491-495. ISSN 1981-8637.

Objective To evaluate the behavior of orthodontic composites, given their fluoride release and uptake ability. Methods The materials were divided into 3 groups: 2 orthodontic composites and 1 resin-reinforced glass ionomer cement used for bonding orthodontic brackets, as follows: Group Q (Quick Cure, Reliance), Group A (Aqualite, OrthoSource) and Group OGLC (Ortho Glass LC, DFL) and a control group. The fluoride release was measured for 28 days (after 1 hour and then 1, 3, 7, 14, 21 and 28 days) via an ion-selective electrode connected to an ion analyzer. To evaluate the recharge of fluoride, the specimens were exposed to sodium fluoride solution (1,000 ppm fluoride) for 28, 30, 31 and 32 days. The variance analysis (ANOVA) and Tukey's tests were used to evaluate between groups (p< 0.05). Results The results showed that the materials reached the peak of fluoride release 24 hours after polymerization. There was a statistical difference between groups Q and A at the time intervals of 1 hour and at at 1, 3, 7, 14 days and after recharge with fluoride (p˂ 0.05). The Q and A groups showed a statistical difference with the Group OGLC in all periods p< 0.05). Conclusion The Quick Cure composite showed a higher initial ability for fluoride uptake and release compared to the Aqualite composite. Both composites showed similar performance after 21 dias.

Keywords : Composite resins; Fluorine; Sodium fluoride.