Prevest Crysta Bioactive is a radiopaque, Hydroxyapatite Modified-Glass lonomer Cement for restoration of primary teeth, core build up, restoration of class I, limited class II cavities and as a base and liner material. Hydroxyapatite provides a positive environment and indirectly decreases the caries susceptibility of individuals. It has excellent tooth adhesion, sustained fluoride release, high compressive strength and mineralizing potential. Indications :- Core build-up Restoration of primary teeth Cases where radiopacity is required Temporary endodontic fillings Class I, limited Class II, temporary fillings, etc. As a base or liner Intermediate restoratives and base material for class I and II cavities using the sandwich technique Advantages :- Anticariogenic Tooth coloured Accelerated remineralisation Excellent chemical bonding to dentin and enamel Radiopaque for easy post operative diagnosis