Compromised dental cells viability following teeth-whitening exposure

• Published in: Scientific reports Vol. 11; no. 1; p. 15547
• Main Authors: Redha, Ola, Mazinanian, Morteza, Nguyen, Sabrina, Son, Dong Ok, Lodyga, Monika, Hinz, Boris, Odlyha, Marianne, McDonald, Ailbhe, Bozec, Laurent
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 30.07.2021; Nature Publishing Group; Nature Portfolio
• Subjects: 631/1647/767; 692/698/3008/3010; 692/698/3008/3011; 692/698/3008/3012; Cell morphology; Cell viability; Cytology; Dental enamel; Dental pulp; Dentin; Enamel; Humanities and Social Sciences; Hydrogen peroxide; multidisciplinary; Perfusion; Science; Science (multidisciplinary); Stem cells; Teeth
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-021-94745-w

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% H 2 O 2 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 H 2 O 2 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.