Dualcured

Dualcured, often written dual-cured, describes resin-based dental materials that can polymerize through two activation mechanisms: chemical self-curing and light-activation (photo-curing). The term is commonly used in dentistry to describe materials that can harden even in areas where light cannot reach, while allowing rapid curing where illumination is available.

In a dual-cure system, initiators for chemical curing (such as benzoyl peroxide paired with an amine accelerator) work together with photoinitiators (often camphorquinone and related components). When light is applied, photoinitiation accelerates polymerization; in deeper or opaque regions, the chemical reaction continues after mixing or after light exposure ends. The resulting network forms via free-radical polymerization of methacrylate monomers, providing a more complete cure than light alone in challenging clinical conditions.

Common uses include resin cements for indirect restorations (crowns, inlays, onlays), core-build-up materials, and some bonding agents, where predictable polymerization is needed beneath opaque or thick restorations. Dual-cure formulations are chosen when sufficient light-reaching depth cannot be assured or when early strength and bond integrity are required.

Advantages of dual-cure systems include reliable curing in deep cavities or under opaque substrates, reduced risk of marginal gaps, and improved early strength. Potential considerations involve sensitivity to mixing quality and material compatibility, possible esthetic changes due to byproducts, and the need to follow manufacturer instructions to optimize both curing pathways.

See also: Dental materials, Light-curing, Self-cure resins.