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

A comparative study of bulk-fill composites: degree of conversion, post-gel shrinkage and cytotoxicity

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Autor(es):
Goncalves, Flavia [1] ; de Paiva Campos, Luiza Mello [2] ; Rodrigues-Junior, Ezequias Costa [3] ; Costa, Fabricia Viana [4] ; Marques, Pamela Adeline [4] ; Francci, Carlos Eduardo [3] ; Braga, Roberto Ruggiero [3] ; Cidreira Boaro, Leticia Cristina [4]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Ibirapuera, Sao Paulo, SP - Brazil
[2] Univ Sao Paulo, Inst Energy & Nucl Res, Lab Polymers & Nanotechnol, Sao Paulo, SP - Brazil
[3] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, Sao Paulo, SP - Brazil
[4] Univ Santo Amaro Unisa, Sch Dent, Sao Paulo, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Brazilian Oral Research; v. 32, p. -, 2018.
Citações Web of Science: 10
Resumo

Abstract: Bulk-fill composites are claimed to be restorative materials used in deep preparations and effectively photoactivated in layers up to 4 mm. The aim of the present study was to evaluate the degree of conversion, post-gel volumetric shrinkage, and cytotoxicity of six bulk-fill and two conventional composites. Degree of conversion was determined by FTIR spectroscopy; post-gel volumetric shrinkage was determined using the strain gauge method; and cytotoxicity in human fibroblasts was evaluated indirectly by the MTT assay. Data were subjected to one-way ANOVA/Tukey's test (α = 0.05). All materials, including bulk-fill and conventional composites, were classified as non-toxic, with cell viability higher than 70%. Bulk-fill composites exhibited volumetric shrinkage similar to or lower (1.4 to 0.4%) than that of conventional composites (1.7–2.1%). However, only four of the bulk-fill composites were able to sustain a homogeneous conversion at the 4-mm depth. Despite their non-toxicity and shrinkage similar to that of conventional materials, not all commercial bulk-fill materials were able to maintain a conversion as high as 80% of the superficial layer, at the 4-mm depth, indicating some failure in the bulk-fill design of some commercial brands. Therefore, the use of bulk-fill materials in dental practice is advantageous, but special attention should be given to the selection and correct use of the 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
Processo FAPESP: 16/01319-9 - Desenvolvimento de nanocompósitos odontológicos a base de BisGma/TEGDMA com atividade antimicrobiana utilizando nanopartículas de MMT carregadas com clorexidina
Beneficiário:Letícia Cristina Cidreira Boaro
Linha de fomento: Auxílio à Pesquisa - Regular