Which compounds are added to dentifrices for controlling the formation of supramarginal calculus?

The inclusion of pyrophosphates in dentifrices is specifically aimed at controlling the formation of supramarginal calculus, which is the mineralized plaque that accumulates above the gum line. Pyrophosphates work by inhibiting the crystallization of calcium phosphate, which is a key component in the formation of calculus. By interfering with this process, pyrophosphates help to reduce the rate of calculus formation, making them effective agents for patients prone to tartar build-up.

In contrast, other agents listed serve different purposes. For example, triclosan is primarily an antibacterial agent intended to reduce plaque and gingivitis rather than directly preventing calculus formation. Hydrogen peroxide is often used for its whitening properties and antiseptic effects but does not play a significant role in calculus control. Stannous fluoride is effective for its ability to prevent caries and reduce sensitivity, but its impact on supramarginal calculus formation is not as direct as that of pyrophosphates. Thus, pyrophosphates stand out as the most effective compounds in addressing the specific challenge of supramarginal calculus formation.