Scientific Reports (Jul 2021)

Compromised dental cells viability following teeth-whitening exposure

  • Ola Redha,
  • Morteza Mazinanian,
  • Sabrina Nguyen,
  • Dong Ok Son,
  • Monika Lodyga,
  • Boris Hinz,
  • Marianne Odlyha,
  • Ailbhe McDonald,
  • Laurent Bozec

DOI
https://doi.org/10.1038/s41598-021-94745-w
Journal volume & issue
Vol. 11, no. 1
pp. 1 – 9

Abstract

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Abstract This study aimed to assess the viability of dental cells following time-dependent carbamide peroxide teeth-whitening treatments using an in-vitro dentin perfusion assay model. 30 teeth were exposed to 5% or 16% CP gel (4 h daily) for 2-weeks. The enamel organic content was measured with thermogravimetry. The time-dependent viability of human dental pulp stem cells (HDPSCs) and gingival fibroblast cells (HGFCs) following either indirect exposure to 3 commercially available concentrations of CP gel using an in-vitro dentin perfusion assay or direct exposure to 5% H2O2 were investigated by evaluating change in cell morphology and by hemocytometry. The 5% and 16% CP produced a significantly lower (p < 0.001) enamel protein content (by weight) when compared to the control. The organic content in enamel varied accordingly to the CP treatment: for the 16% and 5% CP treatment groups, a variation of 4.0% and 5.4%, respectively, was observed with no significant difference. The cell viability of HDPSCs decreased exponentially over time for all groups. Within the limitation of this in-vitro study, we conclude that even low concentrations of H2O2 and CP result in a deleterious change in enamel protein content and compromise the viability of HGFCs and HDPSCs. These effects should be observed in-vivo.