Composite Resin
Properties and applications of dental composite resin materials.
Dental composite resin is a tooth-colored restorative material consisting of a resin matrix (typically Bis-GMA or UDMA), inorganic filler particles (silica, glass, quartz), and a coupling agent (silane) that bonds the filler to the matrix. The material is cured by visible light activation of photoinitiators, transforming it from a moldable paste into a hard, durable restoration. Composite resins are classified by filler particle size: macrofilled, microfilled, hybrid, nanofilled, and nanohybrid. Each type offers different characteristics. Nanofilled composites provide excellent polish and aesthetics, while hybrid composites offer a balance of strength and aesthetics suitable for both anterior and posterior restorations. Flowable composites have lower filler content for better adaptation in tight spaces. Modern composites have advanced significantly in strength, wear resistance, and color stability. They bond directly to tooth structure using adhesive systems, preserving more natural tooth compared to amalgam restorations. Bulk-fill composites allow placement in larger increments, reducing procedure time. Ongoing research focuses on self-healing composites, bioactive fillers that release therapeutic ions, and reducing polymerization shrinkage.