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Q: Sodium perborate monohydrate incorporated in tooth bleach compositions.

A: Since its introduction in early 1989, there has been significant interest among the dental profession and the general public for home-use tooth bleaching products and methods. Typical dental bleaching compositions include from 5-20% by weight of carbamide peroxide (CO(NH2)2.H2O2), which is a complex of urea and hydrogen peroxide. However, sodium perborate has been found to be an another dental bleaching agent. An advantage of perborate-based bleaching agents rather than aqueous hydrogen peroxide or carbamide peroxide is that perborates are allowed for dental bleaching procedures in some countries that do not permit the use of aqueous hydrogen peroxide and carbamide peroxide for dental bleaching. Perhaps perborate compounds are more gentle on surrounding gums and tissues compared to either aqueous hydrogen peroxide or carbamide peroxide. Nevertheless, perborates were found to be unstable when blended with carboxypolymethylene, which is the tackifying agent of choice in the vast majority of home bleaching kits presently on the market. For this reason, a tackifying agent that is stable in the presence of perborate bleaching agents has been developed, which comprises a mixture of a suitable polyol and a finely divided gel-forming particulate such as fumed silica, otherwise known as silica fume. 

 

Below is a sample dental bleaching composition that combines the following ingredients (in weight percent):

• Anhydrous Propylene Glycol         54.3% 

• Fumed Silica                                  20%

• Sodium Perborate Monohydrate   25%

• Sodium Saccharine                       0.7%

A: Since its introduction in early 1989, there has been significant interest among the dental profession and the general public for home-use tooth bleaching products and methods. Typical dental bleaching compositions include from 5-20% by weight of carbamide peroxide (CO(NH2)2.H2O2), which is a complex of urea and hydrogen peroxide. However, sodium perborate has been found to be an another dental bleaching agent. An advantage of perborate-based bleaching agents rather than aqueous hydrogen peroxide or carbamide peroxide is that perborates are allowed for dental bleaching procedures in some countries that do not permit the use of aqueous hydrogen peroxide and carbamide peroxide for dental bleaching. Perhaps perborate compounds are more gentle on surrounding gums and tissues compared to either aqueous hydrogen peroxide or carbamide peroxide. Nevertheless, perborates were found to be unstable when blended with carboxypolymethylene, which is the tackifying agent of choice in the vast majority of home bleaching kits presently on the market. For this reason, a tackifying agent that is stable in the presence of perborate bleaching agents has been developed, which comprises a mixture of a suitable polyol and a finely divided gel-forming particulate such as fumed silica, otherwise known as silica fume. 

 

Below is a sample dental bleaching composition that combines the following ingredients (in weight percent):

• Anhydrous Propylene Glycol         54.3% 

• Fumed Silica                                  20%

• Sodium Perborate Monohydrate   25%

• Sodium Saccharine                       0.7%