Which sealant type does not require mixing and hardens when exposed to a curing light?

Which sealant type does not require mixing and hardens when exposed to a curing light?

• A. Light-cured sealants
• B. Self-cured materials
• C. Filled sealants
• D. Unfilled sealants

Answer: (A)

Light-cured sealants are designed as single-component resins that harden when exposed to a curing light. Because there’s no need to mix two components, no mixing is required, and the polymerization is initiated by light energy during curing. Self-cured materials, on the other hand, rely on a chemical reaction between mixed components to set, so they require combining ingredients and do not depend primarily on light to start hardening (though dual-cure versions exist). Filled versus unfilled describes filler content and affects properties, not the basic curing mechanism—either type can be light- or chemically cured. So, the sealant that fits both criteria—no mixing and light-activated hardening—is the light-cured type.

Light-cured sealants are designed as single-component resins that harden when exposed to a curing light. Because there’s no need to mix two components, no mixing is required, and the polymerization is initiated by light energy during curing. Self-cured materials, on the other hand, rely on a chemical reaction between mixed components to set, so they require combining ingredients and do not depend primarily on light to start hardening (though dual-cure versions exist). Filled versus unfilled describes filler content and affects properties, not the basic curing mechanism—either type can be light- or chemically cured. So, the sealant that fits both criteria—no mixing and light-activated hardening—is the light-cured type.