Glass ionomers have two primary clinical roles; which are they?

• A. Cement
• B. Restorative material
• C. Both luting cement and restorative material
• D. Base material

Answer: (C)

Glass ionomer cements are valued for two main clinical roles because of their chemical bonding to tooth structure and their fluoride-releasing, biocompatible nature. As a luting cement, they bond directly to dentin and enamel without needing a separate bonding agent, helping to seal the margins around indirect restorations such as crowns, inlays, and onlays. The fluoride released at the tooth-restoration interface adds an anti-cariogenic benefit and can contribute to long-term marginal health. As a direct restorative material, they can fill small to moderate defects, especially in areas with moisture control challenges or in the pediatric or non-load-bearing contexts, where their chemical bond to tooth structure, ease of use, and fluoride release are advantageous. They are less wear-resistant than some composites, so their use as a primary posterior restoration is more limited, but their dual function as both cement and direct-restorative material is what distinguishes them. Using them primarily as bases or liners is less characteristic of their main clinical roles.