Influência da adição de nanopartículas de sílica nas propriedades mecânicas de gessos odontológicos

• Ano de defesa: 2017
• Autor(a) principal: Cesero, Leonardo de
• Orientador(a): Mota, Eduardo Gonçalves
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Pontifícia Universidade Católica do Rio Grande do Sul
• Programa de Pós-Graduação: Programa de Pós-Graduação em Odontologia
• Departamento: Escola de Ciências da Saúde
• País: Brasil
• Palavras-chave em Português: Gesso Dentário; Materiais Dentários; Nanopartículas de Sílica
• Área do conhecimento CNPq: CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: http://tede2.pucrs.br/tede2/handle/tede/7904

The current applications of nanotechnology in dentistry include adhesive systems and composite resins, but they are still quite limited in dental materials. Dental stone is a widely used material, and the incorporation of silica nanoparticles is still unexplored. The purpose of this study is to evaluate the behavior of the mechanical properties of dental stones with the addition of silica nanoparticles at different concentrations. A total of 180 samples were prepared, 90 for each dental stone (Durone and Fuji Rock). For the control group (CG), no silica particles were added, while test group 1 (TG1) had silica nanoparticles added to 1% by weight, and test group 2 (TG2) had silica nanoparticles added to 5% by weight. The roughness, diametral tensile strength (DTS) and compressive strength were measured 24 hours after the start of spatulation. The mean roughness values for Durone were CG= 0,55, TG1= 0,36 and TG2= 0,28 μm and for Fuji Rock were CG= 0,47, TG1= 0,31 and TG2= 0,35 μm. The mean DTS values for Durone were CG= 6,03, TG1= 5,17 and TG2= 5,02 MPa and for Fuji Rock were CG= 6,41, TG1= 5,23 and TG2= 4,56 MPa. The mean compressive strength values for Durone were CG= 35,44, TG1= 32,70 and TG2= 32,44 MPa and for Fuji Rock were CG= 42,97, TG1= 31,22 and TG2= 29,86 MPa. Surface roughness was statistically lower for the Durone and Fuji Rock stones (p< 0,001) when silica nanoparticles were added. For DTS and compressive strength, the addition of silica nanoparticles did not lead to statistically better results when compared to the control groups (p> 0,05).