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Does the combination of whitening toothpaste and hydrogen peroxide bleaching increase the surface roughness and change the morphology of a nanofilled composite?
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Keywords

Tooth bleaching
Toothpastes
Composite resins
Microscopy
Electron
Scanning

How to Cite

1.
Tenório CP da SB, Kury M, Mota GM dos SM, Turssi CP, Amaral FLB do, Cavalli V. Does the combination of whitening toothpaste and hydrogen peroxide bleaching increase the surface roughness and change the morphology of a nanofilled composite?. Braz. J. Oral Sci. [Internet]. 2024 Mar. 4 [cited 2024 Jun. 16];23(00):e241938. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8671938

Abstract

Aim: To evaluate changes in the surface roughness and morphology of a nanofilled composite following toothbrushing with a whitening (WT) or regular toothpaste (RT), alone or combined with 35% hydrogen peroxide bleaching (HP). Methods: Seventy disc-shaped nanofilled composite (Filtek Z350XT) specimens were randomly divided into groups (n=10): WT, RT, TB (without toothpaste – control) or the combinations WT/ HP, RT/HP, TB/HP and HP. All groups underwent toothbrushing simulation (60,000 cycles) and bleaching treatment (4 sessions). Mean surface roughness (Ra, μm) was measured before (T0) and after treatments (TB). Surface morphology was assessed by scanning electron microscopy (SEM) at TB. Mean Ra was analyzed using general mixed models and multiple comparisons by the Tukey-Kramer test (α=5%). Results: HP caused no surface roughness changes on the nanofilled composite after treatment (p>0.05). RT toothbrushing, combined or not with HP, increased the surface roughness (p<0.05). WT and WT/ HP protocols had no effect on the surface roughness of the composite (p>0.05). The nanofilled composite submitted to RT toothbrushing combined with HP (RT/HP) presented substantial surface alterations under SEM, showing deep depressions and round-shaped defects. Toothbrushing with RT combined with the bleaching agent increased exposure of the inorganic fillers. Conclusion: WT toothbrushing, regardless of HP combination, or the single HP protocol had no effect on the surface roughness of the nanofilled composite. However, RT combined with HP negatively affected surface roughness and presented the most noticeable surface changes among groups. 

https://doi.org/10.20396/bjos.v23i00.8671938
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References

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Copyright (c) 2024 Cecília Pereira da Silva Braga Tenório, Matheus Kury, Geyse Maria dos Santos Muniz Mota, Cecília Pedroso Turssi, Flávia Lucisano Botelho do Amaral, Vanessa Cavalli

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