Aim: To compare in vitro the remineralizing effect of toothpastes with casein phosphopeptide-amorphous calcium phosphate (FPC-FCA) and sodium fluoride on the artificial erosion of tooth enamel. Materials and methods: For the first phase of artificial erosion, group I was considered as the control group without treatment or erosion. For groups II and IV, the drink was used (Coca-Cola®), for groups III and V, the drink (Inca-Kola®), and the four groups were demineralized four times a day (every 3 hours for 2 minutes) for 5 days. In the treatment phase in groups II and III, brushing was performed with sodium fluoride paste (Colgate®), groups IV and V received brushing with FPC-FCA complex (MiPaste®), and for all groups, the same procedure was performed four times a day (every 3 hours for 5 minutes) for 90 days. At the end, the microroughness of the surfaces of all the groups was evaluated by means of a Rugosimeter (Mitutoyo). Results: It was evidenced that the group of sodium fluoride presented a microroughness of 2.79 μm being the group of least remineralization, but the FPC-FCA complex showed a microroughness of 1.96 μm; however, the control group presented a microroughness of 3.20 μm, and the groups sodium fluoride, FPC-FCA compared to the control group proved to be statistically significant with a p < 0.05. Conclusion:The remineralizing effect of FPC-FCA (MiPaste®) complex proved to be greater than sodium fluoride paste (Colgate®) under artificial enamel erosive conditions. Clinical importance: The results of this research serve as a basis for industries to generate products that have the potential for remineralization against various erosive beverages that are consumed daily.

Aim: To compare the application of silane in the bond strength of fiberglass posts in different thirds of the cemented root with a self-adhesive system in an ex vivo study. Materials and methods: Freshly extracted teeth were collected, which had indication of extraction for periodontal or orthodontic reasons. The study evaluated n = 42 specimens that were divided into two large groups: I (control, without silane) and II (with silane); the resistance to adhesion in the respective thirds of the root (cervical, middle, and apical) was also evaluated. The prefabricated fiberglass posts were cemented with and without silane according to the manufacturer's instructions and were cemented with a resin-based cementing agent. The adhesion strength test was evaluated by the universal testing machine. Results: According to the results of this experimental trial, the fiberglass posts that did not receive silane had the highest adhesion strength of 26.5 ± 10.6 MPa, while silane-cemented posts only had 21.7 ± 8.1 MPa. The statistical analysis was performed using the Kruskal-Wallis test and work with a level of significance of p < 0.05. Conclusion:The use of silane as part of the cementing protocol in fiberglass posts does not influence the adhesion strength between the surfaces of the posts and the resin cement because there were statistically significant differences between both adhesion protocols. Clinical significance: This study has a great impact because according to the results, clinical decisions can be made when cementing the fiberglass posts through the application of silane or not.

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