What property does filler material primarily improve in a sealant?

• A. Wear resistance
• B. Color stability
• C. Adhesion to enamel
• D. Radiopacity

Answer: (A)

The main idea is that adding filler material to a sealant is aimed at boosting its mechanical durability, especially against wear from chewing. Inorganic fillers like silica or glass harden the resin and increase its abrasion resistance and strength, helping the sealant stand up to the grinding and chewing forces that act on occlusal surfaces. This keeps the sealant intact longer and maintains the seal in the pits and fissures.

Color stability, adhesion to enamel, and radiopacity are influenced by various factors, but they’re not the primary reason fillers are added. Fillers can influence color and polishability to some extent, and radiopaque fillers can be used to make a sealant more visible on X-rays, but the principal improvement provided by fillers is wear resistance.