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. 2023 Mar-Apr;34(2):67-74.
doi: 10.1590/0103-6440202304950.

Composite resin reinforced with silk nanoparticles from Bombyx mori cocoon for dental applications

Adriana da Silva Torres  1 , João Vinícios Wirbitzki da Silveira  2 , Moisés de Matos Torres  2 , Cintia Tereza Pimenta de Araujo  1 , Rodrigo Galo  3 , Simone Gomes Dias de Oliveira  1
Affiliations

Composite resin reinforced with silk nanoparticles from Bombyx mori cocoon for dental applications

Adriana da Silva Torres et al. Braz Dent J. 2023 Mar-Apr.

Abstract
in English, Portuguese

The objective of this work was to evaluate the mechanical performance of Z350 resin composite modified with Bombyx mori cocoons silk nanoparticles for dental applications. Four experimental groups were analyzed G0% = Filtek Z350 resin composite (control); G1% = Filtek Z350 with 1% of silk nanoparticles; G3% = Filtek Z350 with 3% of silk nanoparticles; G5% = Filtek Z350 with 5% of silk nanoparticles. It was employed scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, 3-point flexural strength test, Knoop hardness test, and surface roughness. From 3-point flexural strength tests the control group presented the best results G0% = 113.33 MPa (±23.73). The higher flexural modulus was shown by groups G3% = 29.150 GPa (±5.191) and G5% = 34.101 GPa (±7.940), which are statistically similar. The Knoop microhardness test has shown statistical difference only among the G3% group between the top 80.78 (± 3.00) and bottom 68.80 (±3.62) and no difference between the groups. The roughness test presented no statistical difference between the groups. The incorporation of silk nanoparticles reduced the flexural strength of Z350 resin composite. The surface roughness and microhardness tests showed no changes in any of the groups studied.

O objetivo deste trabalho foi avaliar o desempenho mecânico da resina composta Z350 modificada com nanopartículas de seda Bombyx mori cocoons para aplicações odontológicas. Quatro grupos experimentais foram analisados: G0%) Resina Z350 apenas (grupo controle); G1%) Reforço com 1% de nanopartículas de seda; G3%) Reforço com 3% de nanopartículas de seda; e G5%) Reforço com 5% de nanopartículas de seda. Foi empregado microscopia eletrônica de varredura, espectroscopia de energia dispersiva de raios X, difração de raios X, teste de resistência à flexão de 3 pontos, teste de dureza Knoop e rugosidade superficial. Nos testes de resistência à flexão de 3 pontos o grupo controle apresentou melhores resultados G0% = 0.113 GPa (±0.024). O maior módulo de flexão foi demonstrado pelos grupos G3% = 29.151GPa (±5.191) e G5% = 34.102 GPa (±7.94), que são estatisticamente semelhantes. O teste de microdureza Knoop mostrou diferença estatística apenas entre o grupo G3% entre os 80.78 superiores (± 3.00) e os 68.80 inferiores (±3.62). Não há diferença entre os grupos. O teste de rugosidade não apresentou diferença estatística entre os grupos. A incorporação de nanopartículas de seda reduziu a resistência à flexão da resina composta Z350. Os testes de rugosidade superficial e microdureza não apresentaram alterações em nenhum dos grupos estudados.

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Conflict of interest statement

The authors declare no potential conflicts of interest with respect to the authorship and/or publication of this article.

Figures

Figure 1
Figure 1. A and B SEM images from silk nanoparticles with spherical shape and 500 nm and 1000 nm scales, respectively.
Figure 2
Figure 2. EDS spectra and characteristic peaks found in the silk nanoparticles structure.
Figure 3
Figure 3. X-ray diffractogram from silk nanoparticles sample and a characteristic peak at 20º.
See this image and copyright information in PMC

References

    1. Chen H, Wang R, Zhang J, Hua H, Zhu M. Synthesis of core-shell structured ZnO@m-SiO2 with excellent reinforcing effect and antimicrobial activity for dental resin composites. Dent Mater. 2018;34(12):1846–1855. - PubMed
    1. Demarco FF, Pereira-Cenci T, Almeida AD, Sousa BRP, Piva E, Cenci MS. Effects of metallic or translucent matrices for Class II composite restorations: 4-year clinical follow-up findings. Clinical Oral Investigations. 2011;15(1):39–47. - PubMed
    1. Ástvaldsdóttir A, Dagerhamn J, Van Dijken JWV, Naimi-Akbar A, Sandborgh-Englund G, Tranaeus S, et al. Longevity of posterior resin composite restorations in adults - a systematic review. Journal of Dentistry. 2015;43:934–954. - PubMed
    1. Guimarães GMF, Bronze-Uhle ES, Lisboa-Filho PN, Fugolin APP, Borges AFS, Gonzaga CC, et al. Effect of the addition of functionalized TiO2 nanotubes and nanoparticles on properties of experimental resin composites. Dental Materials. 2020;36:1544–1556. - PubMed
    1. Wenk E, Merkle HP, Meinel L. Silk fibroin as a vehicle for drug delivery applications. J. Control. Release. 2011;150:128–141. - PubMed