A new approach for professional dental bleaching using a polymeric catalyst primer

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Oral Health Research

Background:

• Tooth bleaching is a common esthetic dental procedure.
• Hydrogen peroxide (H2O2) is the active agent in most bleaching gels.
• Concerns exist regarding the cytotoxicity and efficacy of H2O2-based bleaching agents.

Purpose of the Study:

• To evaluate the influence of a polymeric catalyst primer (PCP) on the esthetic efficacy (EE) of bleaching gels.
• To assess the impact of PCP on the degradation kinetics of hydrogen peroxide (H2O2).
• To determine the trans-amelodentinal cytotoxicity (TC) of bleaching gels when used with PCP.

Main Methods:

• Experimental groups included various concentrations of H2O2 with and without PCP.
• Esthetic efficacy was determined using stained enamel/dentin discs subjected to bleaching.
• Cytotoxicity was assessed by applying gel extracts to odontoblast-like cells, measuring viability and oxidative stress.

Main Results:

• The highest esthetic efficacy was observed with PCP and 35% H2O2.
• Using PCP with 10% H2O2 limited H2O2 diffusion, reduced oxidative stress, and increased cell viability.
• PCP application alongside bleaching gels demonstrated significant effects on H2O2 kinetics and cytotoxicity.

Conclusions:

• Coating enamel with PCP before 10% H2O2 bleaching maintains esthetic efficacy.
• PCP application minimizes the toxic effects of bleaching therapy on dental pulp cells.
• PCP shows potential to enhance in-office tooth bleaching while reducing its associated risks.