Glass ionomers are used as cement and restorative materials. Which option best describes this dual use?

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

Answer: (C)

Glass ionomer cements are versatile because they can bond to tooth structure and release fluoride, giving two practical roles in dentistry. As a luting cement, they attach indirect restorations—such as crowns and inlays—to dentin and enamel through a chemical bond, helping seal margins and slightly protect against caries. As a direct restorative material, they provide a tooth-colored option that also releases fluoride, and their setting reaction tolerates moisture to some extent, making them useful for certain direct restorations, especially in cases like atraumatic restorative techniques or pediatric work. This dual capability is why they’re described as both a luting cement and a restorative material. They’re not primarily used as a base material, which is a different function under restorations.