Resin cements are popular and well-accepted for veneers, tooth-colored inlays, onlays and crowns, Maryland bridges and salvaging old useful crowns and fixed prostheses. Although used by a few practitioners for routine cementation of all crowns and fixed prostheses, it is doubtful that this trend will grow. A new category of cements--glass ionomer resin--soon will be available from several companies. It should be considered a routine cement as soon as it has proved itself. Its properties appear promising and nearly ideal.