 A systematic review supports the use of RMGIC in small to moderate sized class II cavities, as they are able to withstand the occlusal forces on primary molars for at least one year.With their desirable fluoride releasing effect, RMGIC may be considered for Class I and Class II restorations of primary molars in high caries risk population.With regard to permanent teeth, there is insufficient evidence to support the use of RMGIC as long term restorations in permanent teeth.