No abstract

Our results suggest that the anti-inflammatory therapy with low-power LED (880 nm) enhanced the tissue response in all groups. We can conclude that the LED was able to reduce signs of inflammation in collagenase-induced tendinitis in rats by reducing the number of inflammatory cells and decrease mRNA expression of cytokines.

Objective: The aim of this work was to compare the effect of low-level laser therapy (LLLT) on the wound healing process in nondiabetic and diabetic rats. Background Data: Among the clinical symptoms caused by diabetes mellitus, a delay in wound healing is a potential risk for patients. It is suggested that LLLT can improve wound healing. Methods: The tissue used for this study was extracted from animals suffering from diabetes, which was induced by Streptozotocin ® , and from nondiabetic rats. Animals were assembled into two groups of 25 rats each (treated and control) and further subdivided into two groups: diabetic (n = 15) and nondiabetic (n = 10). A full-thickness skin wound was made on the dorsum area, with a round 8-mm holepunch. The treated group was irradiated by a HeNe laser at 632.8 nm, with the following parameters: 15 mW, exposition time of 17 sec, 0.025 cm 2 irradiated area, and energy density of 10 J/cm 2 . Square full-thickness skin samples (18 mm each side, including both injured and noninjured tissues) were obtained at 4, 7, and 15 days after surgery and analyzed by qualitative and quantitative histological methods. Results: Quantitative histopathological analysis confirmed the results of the qualitative analysis through histological microscope slides. When comparing tissue components (inflammatory cells, vessels and fibroblast/area), we found that treated animals had a less intense inflammatory process than controls. Conclusion: Results obtained by both qualitative and quantitative analyses suggested that irradiation of rats with HeNe (632.8 nm), at the tested dose, promoted efficient wound healing in both nondiabetic and diabetic rats as, compared to the control group. 474

Since bovine teeth have been used as substitutes for human teeth in in vitro dental studies, the aim of this study was to compare the radiographic density of bovine teeth with that of human teeth to evaluate their usability for radiographic studies. Thirty bovine and twenty human teeth were cut transversally in 1 millimeter-thick slices. The slices were X-rayed using a digital radiographic system and an intraoral X-ray machine at 65 kVp and 7 mA. The exposure time (0.08 s) and the target-sensor distance (40 cm) were standardized for all the radiographs. The radiographic densities of the enamel, coronal dentin and radicular dentin of each slice were obtained separately using the 'histogram' tool of Adobe Photoshop 7.0 software. The mean radiographic densities of the enamel, coronal dentin and radicular dentin were calculated by the arithmetic mean of the slices of each tooth. One-way ANOVA demonstrated statistically significant differences for the densities of bovine and human enamel (p < 0.05) and for bovine and human coronal dentin (p < 0.05). No statistically significant differences were found for the bovine and human radicular dentin (p > 0.05). Based on the results, the authors concluded that: a) the radiographic density of bovine enamel is significantly higher than that of human enamel; b) the radiodensity of bovine coronal dentin is statistically lower than the radiodensity of human coronal dentin; bovine radicular dentin is also less radiodense than human radicular dentin, although this difference was not statistically significant; c) bovine teeth should be used with care in radiographic in vitro studies.

A pandemia causada pelo novo coronavírus adquiriu grandes proporções e seu impacto na sociedade tem se tornado cada vez mais significativo. No que diz respeito ao ensino, as instituições buscaram nas estratégias de atividades educacionais remotas, uma alternativa para manter seus alunos em atividade, minimizando as consequências que as políticas de isolamento social poderiam acarretar nas atividades acadêmicas. Este estudo, de caráter descritivo, qualitativo e quantitativo, do tipo relato de experiência, foi elaborado a partir da necessidade de adequação repentina das estratégias pedagógicas na Disciplina de Histologia e Embriologia do Curso de Odontologia de uma universidade pública brasileira. Objetivou-se expor as diferentes possibilidades de estratégias e ferramentas pedagógicas que têm sido utilizadas, bem como analisar o desempenho acadêmico e engajamento dos estudantes. Os docentes da Disciplina buscaram não apenas soluções emergenciais temporárias para dar continuidade à Disciplina, mas se esforçaram em recriar um novo modelo educacional, considerando o uso de metodologias ativas de ensino para uma aprendizagem significativa, mediante o emprego virtual de estratégias pedagógicas e ferramentas digitais, oportunizando o desenvolvimento da autonomia e a auto responsabilidade dos estudantes. Os resultados mostraram engajamento e desempenho promissores dos estudantes, porém este estudo é limitado aos dados em um curto período, tornando necessário o desenvolvimento de estudos longitudinais para avaliar efetivamente os impactos desse modelo educacional não apenas no engajamento e desempenho dos estudantes, mas na sua aprendizagem e na qualidade da educação.