Which type of glass ionomer cement is used primarily for cementing metal restorations?

Type I glass ionomer cement is primarily used for cementing metal restorations due to its specific formulation that allows for strong adhesion and support for load-bearing applications. This type of cement is designed to bond effectively with metal surfaces, creating a durable and lasting bond essential for the longevity of dental restorations such as crowns and bridges.

Type I glass ionomer cement excels in its ability to provide a strong mechanical retention and also releases fluoride, which adds to its benefits in preventing secondary caries. It is specifically formulated to deliver the necessary characteristics required for luting, making it the preferred choice for dentist in contexts where metal restorations are involved. This differentiates it from other types of glass ionomer cements, which may be utilized for different purposes such as restorative work or as a liner or base in cavity preparation but are not primarily focused on cementing metal restorations.