Glass ionomer is a:

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Glass ionomer cement is a permanent luting cement that contains fluoride and can bond chemically to tooth structure. Its fluoride release helps fight decay, and its chemical adhesion to dentin and enamel makes it reliable for cementing crowns, inlays, onlays, and bridges. It also serves as a base material under restorations due to its insulating properties. Additionally, its esthetic qualities and fluoride benefit make it suitable for small anterior restorations. It is not used as a temporary cement, an adhesive bonding agent by itself, or an impression material.