What aspect of filled sealant material contributes to a lower wear rate?

The aspect of filled sealant material that contributes to a lower wear rate is the inclusion of added fillers. Fillers enhance the physical properties of the sealant, including its abrasion resistance and overall hardness. This helps the sealant material to withstand the mechanical forces that occur during chewing and grinding, which can otherwise lead to wear over time. The presence of fillers increases the density and structural integrity of the sealant, resulting in a more durable and long-lasting application.

Higher viscosity relates to the flow and application characteristics of the sealant but does not directly influence wear resistance. A strong chemical bond may enhance adhesion to the tooth surface but is not primarily responsible for mitigating wear. Pulpal protection, while important in terms of preserving tooth health, does not have an impact on the wear rate of the sealant material itself. Therefore, the added fillers play the critical role in reducing wear rates, making them the key factor in this context.