Sealant material often contains filler particles. What is their purpose?

The presence of filler particles in sealant materials primarily serves the purpose of making the sealant more resistant to abrasion and wear. These filler particles enhance the physical properties of the sealant, providing it with additional strength and durability. This is particularly important in the context of dental sealants, as they are applied to occlusal surfaces of teeth where they will come into contact with masticatory forces and abrasive foods. Enhancing the abrasion resistance helps in prolonging the lifespan of the sealant, effectively protecting the teeth from decay and wear over time.

Other options touch on different aspects such as aesthetics, adhesion, or fluidity, but the fundamental role of filler particles aligns closely with increasing the sealant's resistance to everyday wear and tear. This ensures that the sealant maintains its protective function over an extended period, which is critical to its effectiveness in preventing caries.