RESUMO
OBJECTIVE: To evaluate experimental dimethacrylate-based materials containing calcium orthophosphates or calcium silicate particles in terms of their optical, mechanical and Ca2+ release behaviour. METHODS: Dicalcium phosphate dihydrate (DCPD), hydroxyapatite (HAp), beta-tricalcium phosphate (ß-TCP) or calcium silicate (CaSi) particles were added to a photocurable BisGMA/TEGDMA resin (1:1 in mols) at a 30 vol% fraction. Materials containing silanized or non-silanized barium glass particles were used as controls. Degree of conversion (DC) at the top and base of 2-mm thick specimens was determined by ATR-FTIR spectroscopy (n = 5). Translucency parameter (TP) and transmittance (%T) were determined using a spectrophotometer (n = 3). Biaxial flexural strength (BFS) and flexural modulus (FM) were determined by biaxial flexural testing after 24 h storage in water (n = 10). Ca2+ release in water was determined during 28 days by inductively coupled plasma optical emission spectrometry (n = 3). Statistical analysis was performed using ANOVA/Tukey test (DC: two-way; TP, %T; BFS and FM: one-way; Ca2+ release: repeated measures two-way, α = 5 %). RESULTS: CaSi and ß-TCP particles drastically reduced DC at 2 mm, TP and %T (p < 0.001). Compared to both controls, all Ca2+-releasing materials presented lower BFS (p < 0.001) and only the material with DCPD showed significantly lower FM (p < 0.05). The material containing CaSi presented the highest Ca2+ release, while among materials formulated with calcium orthophosphates the use of DCPD resulted in the highest release (p < 0.001). SIGNIFICANCE: CaSi particles allowed the highest Ca2+ release. Notwithstanding, the use of DCPD resulted in a material with the best compromise between optical behaviour, DC, strength and Ca2+ release.
RESUMO
O paradesporto no Brasil vem se fomentando devido a um conjunto de motivos, como o fato de termos sediado as Paralimpíadas Mundiais 2016, maior interesse do público/mídia, aumento no número de adeptos das modalidades e construção do centro de treinamento. Além disso, o legado deixado pelo eventose constituiutambém no aumento das expectativas de todosos envolvidos nessemovimento. Sendo assim, buscou-se analisar as expectativas de paratletas em nível escolar. Entrevistou-se 114 atletas brasileiros de ambos os sexos, com idade média de±15,45 anos, participantes das Paralimpíadas Escolares. Identificou-se a relevância da participação nessacompetição na modificação da percepção dos jovensem relação aos seusprojetos futuros e a oportunidade de serem valorizados e vistos com orgulho pelo meio social.
The paradesport in Brazil is being promoted due to a number of reasons, such as the fact that we have hosted the World Paralympics, greater public/media interest, increase in the number of fans of the modalities and construction of the training center. In addition, the legacy left is also an increase in the expectations of all those involved in this movement. Thus, we sought to analyze the expectations of paratletas at school level. We interviewed 114 Brazilian athletes, of both sexes, of age ±15.45 years, participating in School Paralympic Games. It was identified the relevance of participation in this competition in the modification of the perception in relation to future projects and as an opportunity to be seen as an object of valorization and pride in the social environment.
El paradesporto en Brasil se viene fomentando debido diversos motivos, como el hecho de tener ubicadas las Paralimpíadas Mundiales 2016, mayor interés del público/imprenta, mayor número de adeptos de modalidades y construcción del centro de entrenamiento. Además, el legado dejado se constituye también en el aumento de expectativas de todos involucrados en el movimiento. Siendo así, se buscó analizar las expectativas de paratletas a nivel escolar. Entrevistó 114 atletas brasileños, de ambos sexos, de edad ±15,45 años, participantes de las Paralimpíadas Escolares. Se identificó la relevancia de la participación en esta competición en la modificación de la percepción de los proyectos futuros y como oportunidad de ser vistos como objeto de valorización y orgullo por el medio social.