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Nanoparticle Loading Level and Properties of Experimental Hybrid Resin Luting Agents
Author(s) -
Habekost Luciano V.,
Camacho Guilherme B.,
Lima Giana S.,
Ogliari Fabrício A.,
Cubas Glória B.,
Moraes Rafael R.
Publication year - 2012
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2012.00867.x
Subject(s) - materials science , nanoparticle , luting agent , composite material , nanotechnology , adhesive , bond strength , layer (electronics)
Purpose: This study investigated the influence of nanoparticle loading level on properties of experimental hybrid resin luting agents. Materials and Methods: Silanated 2‐μm barium borosilicate glass microparticles and 7‐nm silica nanoparticles were used. Five materials were obtained by loading a photocurable Bis‐GMA/TEGDMA co‐monomer with a total mass fraction of 60% inorganic fillers. The mass fraction of nanoparticles was set at 0% (control), 1% (G1), 2.5% (G2.5), 5% (G5), or 10% (G10). The properties evaluated were flexural strength (σ) and modulus (E f ), Knoop hardness number (KHN), and film thickness (FT). Dispersion/interaction of the particles with the resin phase was assessed by scanning electron microscopy (SEM). Data were submitted to statistical analysis (5%). Results: For σ, G1 > G2.5 = G5 = G10, and control > G10. For E f , G2.5 > control = G1 > G5 > G10. For KHN, G5 = G10 > control = G1 = G2.5. For FT, G10 = G5 > control = G1, and G10 > G2.5. Incorporation of nanoparticles was associated with observation of clusters in the SEM analysis. The clusters were more frequent for higher nanoparticle loadings. Conclusion: Modest incorporation of nanoparticles may improve the properties of resin luting materials. Nanofiller mass fractions above 2.5% should, however, be avoided because they may be detrimental to the properties of the resin luting agents.