Objective The purpose of the present study was to evaluate the knowledge of Dentistry and Physical Education students on mouthguard usage in sports practice. Methods A form containing questions that demonstrated participants’ knowledge about the use of mouthguards was applied. Inclusion criteria were: individuals older than 18 years who were attending Dentistry or Physical Education courses from the sixth period and who agreed to participate in the study, and the exclusion criteria for dentistry students were: attended the discipline of Dental Materials II of UFPE and already participated in internships in schools or academies for the participants of the Physical Education course. Results it was possible to observe that 97% of the interviewees know what a mouthguard is, but none of the participants would be able to indicate a specific type of mouthguard to sportsmen. Conclusion It was possible to conclude that a large number of the interviewees know what a mouthguard is, but not enough to indicate which is the safest protector.
Purpose
Bulk-fill composite resins were developed to reduce time and facilitate the restorative procedure. However, considering their recent introduction on the market and the new formulations, their performance still requires evaluation. This study aimed to evaluate Knoop microhardness (KHN), diametral tensile strength (DTS) and degree of conversion (DC) of three Bulk-Fill composite resins and a conventional one.
Materials and Methods
Sixty samples (n = 15; 8 mm ø x 4 mm height) were confectioned using a mold. Filtek Bulk-Fill (FBF), Tetric N-Ceram Bulk-Fill (TNC) and SonicFill 2 (SF2) were placed in 4 mm increments, and Filtek Z350 (FZ350) was placed in 2 mm increments. The KHN of top and bottom surfaces were tested using Knoop Hardness tester at 10 gf/10s. The DTS was tested under compressive load at 1.0 mm/min. The DC was measured by Fourier Transform Infrared (FTIR) spectroscopy. Differences in DTS and DC were analyzed by ANOVA and Tukey post hoc test. For KHN, Kruskal–Wallis and Wilcoxon tests were performed at α = 0.05.
Results
Top surfaces of all composite resins had higher KHN than bottom surfaces. At top and bottom surfaces, FZ350 showed higher KHN than TNC and SF2. The highest DTS was obtained by FBF, followed by FZ350 and SF2. The highest DC was obtained by SF2, the lowest one was obtained by FBF.
Conclusion
From Bulk-Fill composite resins, FBF presented the best KHN and DTS results. The SF2 showed the best DC. Further studies are required to ensure whether these differences can negatively influence the behavior of in vivo restorations.
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