Is home tooth bleaching gel cytotoxic?

Area of Science:

• Biomaterials Science
• Cell Biology
• Dental Materials

Background:

• Tooth whitening systems are extensively utilized in both clinical and home settings.
• Understanding the biocompatibility of whitening agents is crucial for patient safety.

Purpose of the Study:

• To evaluate the in vitro cytotoxicity of carbamide peroxide bleaching gels on human endothelial cells.
• To determine if the gel base or the carbamide peroxide concentration is responsible for cytotoxicity.

Main Methods:

• Human endothelial cells were exposed to varying concentrations of carbamide peroxide bleaching gels (10% and 15%), carbamide peroxide alone, and a gel base without peroxide.
• A 30-minute incubation period was followed by a colorimetric MTT viability assay.
• Comparison was made against a negative control (culture medium).

Main Results:

• The gel base without carbamide peroxide showed no significant cytotoxicity compared to the negative control.
• Carbamide peroxide alone, 10% carbamide peroxide gel, and 15% carbamide peroxide gel all demonstrated significant cytotoxicity.
• No statistically significant differences in cytotoxicity were observed among the three carbamide peroxide-containing groups (p > 0.05).

Conclusions:

• Carbamide peroxide is the cytotoxic component in tooth whitening gels.
• Both 10% and 15% carbamide peroxide bleaching gels exhibit in vitro cytotoxicity towards human endothelial cells.
• Further investigation is warranted to understand the discrepancy between in vitro cytotoxicity and in vivo clinical safety.