To examine the effect of different bleaching agents on the solubility and percentage of inorganic components of human dentin and cementum.
Intact teeth were crushed, pulverized, and separated to dentin and cementum powders. The pulverized tissues were exposed to treatments for 15 min and 1, 24, and 72 h with the following:
- 30% H202
- 3% H202
- 2% sodium perborate in 30% H202
- 2% sodium perborate in 3% H202
- 2% sodium perborate in bidistilled water
- 30% H202 and 2% sodium perborate in 30% H202 treatments significantly increased the solubility of dentin and cementum
- The degree of dissolutions and the percentage of inorganic material remaining in the undissolved dentin and cementum increased with time progression
The greatest increase occurred with 30% H202 and 2% sodium perborate in 30% H202 after 24- and 72-h treatments.
30% hydrogen peroxide treatment may cause alteration in the chemical structure of the dentin and cementum making them more susceptible to degradation.