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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Chemical and Mechanical Properties of Experimental Dental Composites as a Function of Formulation and Postcuring Thermal Treatment

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Autor(es):
Esteves, Renata A. [1] ; Boaro, Leticia C. C. [2] ; Goncalves, Flavia [3] ; Campos, Luiza M. P. [4] ; Silva, Cecy M. [1] ; Rodrigues-Filho, Leonardo Eloy [5]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Fed Para, Sch Dent, Rua Augusto Correa 01, BR-66075110 Belem, Para - Brazil
[2] Univ Santo Amaro, Sch Dent, Rua Prof Eneas de Siqueira Neto 340, BR-04829300 Sao Paulo, SP - Brazil
[3] Univ Ibirapuera, Ave Interlagos 1329, BR-04661100 Sao Paulo, SP - Brazil
[4] Univ Sao Paulo, Nucl & Energy Res Inst, Ave Lineu Prestes 2242, BR-05508000 Sao Paulo, SP - Brazil
[5] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, Ave Lineu Prestes 2227, BR-05508900 Sao Paulo, SP - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: BIOMED RESEARCH INTERNATIONAL; 2018.
Citações Web of Science: 2
Resumo

This study evaluated the influence of formulation and thermal treatment on the degree of conversion, fracture toughness, flexural strength, and elastic modulus of experimental composites. Six composites were analyzed at BisGMA: TEGDMA molar ratios of 1 : 1 and 7 : 3 with filler at 30, 50, and 70 wt%. The degree of conversion was analyzed by Fourier transform infrared spectroscopy, fracture toughness was measured using the single-edge notched beam, and flexural strength and elastic modulus were measured with the 3-point bend test. For all tests, one-half of the specimens received thermal treatment at 170 degrees C for 10 min. Data were analyzed by the Kruskal-Wallis or ANOVA/Tukey's test (alpha = 5%). The 1 : 1 BisGMA : TEGDMA ratio showed higher properties than the 7 : 3 ratio. Although the material with 70% filler had a conversion lower than the one with 50%, it showed higher mechanical properties. The thermal treatment improved all properties in all materials. Therefore, the use of an equimolar ratio of BisGMA: TEGDMA can be paired with 70 wt% filler to design dental composites that possess increased advantageous physical and chemical properties. Furthermore, the simple and low-cost method of thermal treatment proposed for use in clinical dentistry has been shown to effectively improve the properties of all evaluated materials. (AU)

Processo FAPESP: 13/07229-3 - Estudo da adição de nanopartículas argilominerais em matrizes poliméricas fotoativadas a base de bisgma/tegdma, aplicadas à odontologia.
Beneficiário:Luiza Mello de Paiva Campos
Linha de fomento: Bolsas no Brasil - Pós-Doutorado