The Microhardness and Surface Roughness Assessment of Bulk-Fill Resin Composites Treated with and without the Application of an Oxygen-Inhibited Layer and a Polishing System: An In Vitro Study
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Fecha
2022-07-28Autor(es)
Cayo Rojas, César Félix
Carrillo-Marcos, Ann
Salazar-Correa, Giuliany
Castro-Ramirez, Leonor
Ladera-Castañeda, Marysela
López-Gurreonero, Carlos
Cachay-Criado, Hernán
Aliaga-Mariñas, Ana
Cornejo-Pinto, Alberto
Cervantes-Ganoza, Luis
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The aim of this study was to assess the microhardness and surface roughness of bulk-fill
resin composites treated with and without the application of an oxygen-inhibited layer (OIL) and a
polishing system. This in vitro experimental study consisted of 72 resin composite blocks divided into
three groups: Tetric N-Ceram Bulk Fill, Opus Bulk Fill APS, and Filtek Bulk Fill. Each resin composite
group was further divided into two subgroups: with and without OIL control. Subsequently, surface
roughness and microhardness were measured before and after polishing. A t-test was used to
compare independent and related measures. For the intergroup comparison of variation before and
after polishing, the Kruskal–Wallis test with Bonferroni post hoc was used considering a significance
level of p < 0.05. When comparing surface roughness, significant differences were observed between
Opus Bulk Fill resin composite with and without OIL control (p = 0.003) before polishing. The
same occurred when comparing Tetric N-Ceram resin composite with and without OIL control
(p = 0.039) after polishing. In addition, the surface roughness of Filtek Bulk Fill, Opus Bulk Fill, and
Tetric N-Ceram Bulk Fill resin composites, with and without OIL control, decreased significantly
after polishing (p < 0.001), while surface microhardness significantly increased (p < 0.05), with the
exception of Opus Bulk Fill resin with OIL control (p = 0.413). In conclusion, OIL control and polishing
significantly improved the surface roughness and surface microhardness of Filtek Bulk Fill and Tetric
N-Ceram Bulk Fill resin composites. However, in the case of Opus Bulk Fill resin composite, only its
surface roughness was significantly improved.
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