Avaliação espectrofotométrica do manchamento de resinas odontológicas contendo nanopartículas
Composite resins have been subjected to structural modifications aiming at improved optical and mechanical properties. The present study consisted in an in vitro evaluation of the staining behavior of two nanohybrid resins (NH1 and NH2), a nanoparticulated resin (NP) and a microhybrid resin (MH)....
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| Natura: | Dissertação |
| Lingua: | por |
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Universidade Federal do Rio Grande do Norte
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| Accesso online: | https://repositorio.ufrn.br/jspui/handle/123456789/12696 |
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| Riassunto: | Composite resins have been subjected to structural modifications aiming at
improved optical and mechanical properties. The present study consisted in an in vitro
evaluation of the staining behavior of two nanohybrid resins (NH1 and NH2), a
nanoparticulated resin (NP) and a microhybrid resin (MH). Samples of these materials
were prepared and immersed in commonly ingested drinks, i.e., coffee, red wine and
acai berry for periods of time varying from 1 to 60 days. Cylindrical samples of each
resin were shaped using a metallic die and polymerized during 30 s both on the bottom
and top of its disk. All samples were polished and immersed in the staining solutions.
After 24 hours, three samples of each resin immersed in each solution were removed
and placed in a spectrofotome ter for analysis. To that end, the samples were previously
diluted in HCl at 50%. Tukey tests were carried out in the statistical analysis of the
results. The results revealed that there was a clear difference in the staining behavior of
each material. The nanoparticulated resin did not show better color stability compared
to the microhybrid resin. Moreover, all resins stained with time. The degree of staining
decreased in the sequence nanoparticulated, microhybrid, nanohybrid MH2 and MH1.
Wine was the most aggressive drink followed by coffee and acai berry. SEM and image
analysis revealed significant porosity on the surface of MH resin and relatively large
pores on a NP sample. The NH2 resin was characterized by homogeneous dispersion of
particles and limited porosity. Finally, the NH1 resin depicted the lowest porosity level.
The results revealed that staining is likely related to the concentration of inorganic pa
rticles and surface porosity |
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