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Aim: The publication in preprint format is an interesting open science practice that allows fast outreach to the society of new scientific findings. However, no previous study has investigated how much this practice has been adopted by dental scientists. Therefore, the objective of this study was to evaluate the adherence to the preprint publication format by a sample of Brazilian researchers. Methods: Searches were carried out, in September 2021, on the MedArxiv, OSF, and SciELO preprints platforms, looking for publications in preprint format by all Brazilian researchers of graduate programs in dentistry (n=211) who were productivity fellows in 2021 (PQ). Searches were performed by typing the authors’ full names and the possible variations, as indicated by each author's curriculum, openly available on the Lattes website platform. The data were analyzed through the Friedman test, with the Durbin-Conover post-hoc (α=0.05) in order to compare the three platforms. Spearman's correlation test (α=0.05) was performed to assess the possible correlations between the number of preprints and age, career stage, and the researcher’s scholarship level variables. Results: From the 211 researchers searched, 22 (10.4%) published 1 (one) preprint on at least one platform. A total of 39 published preprints were found at MedArxiv (n=19, 48.7%), SciELO preprints (n=18, 46.2%), and OSF platforms (n=2, 5.1%). There was no difference between the adherence to MedArxiv and SciELO preprints (p = 0.731). However, the OSF platform presented the lowest adherence, statistically differing from MedArxiv (p=0.008) and SciELO preprints platforms (p=0.003). In addition, no correlation was found between the publication of preprints and the researcher's age (p=0.128), career stage (p=0.248), or the researcher's scholarship level (p=0.661). Conclusion: It was possible to observe a low adherence to the preprints publications by Brazilian researchers’ productivity fellows of graduate programs in dentistry.

Introduction Glass-fiber posts are used in order to improve the retention of restorations in endodontically treated teeth. Objective To evaluate the bond strength of glass-fiber posts submitted to different surface treatments and cemented to the root canal dentin with self-adhesive resin cement. Material and method Thirty roots of human canines were prepared and divided according to two factors: surface treatments (silane, 35% hydrogen peroxide, or sodium bicarbonate) and root thirds (cervical and middle thirds). The glass-fiber posts were cemented with self-adhesive resin cement (RelyX U200). After 24 h, the specimens were prepared for microtensile bond strength test (hourglass format), fracture pattern and micromorphological assessment by scanning electronic microscopy, in order to measure the cement line. Result The data (MPa and µm) were submitted to two-way ANOVA and Tukey’s test (α = 5%). The surface treatments influenced the bond strength of the posts cemented with self-adhesive resin cement (p