Microleakage of Glass Ionomer/composite restoration in Class II cavity in primary molars

Aim : To compare gingival marginal microleakage at the tooth structure / composite resin interface (closed sandwich technique) and tooth structure / glass ionomer interface (open sandwich technique). Method: forty-five exfoliated sound human primary molars extracted at time of shedding were selected. Class II cavity was prepared in each tooth. The teeth were randomly divided into three equal groups according to the restoration procedure, each group contained fifteen teeth; Group (I) open Sandwich Technique, Group (II) Closed Sandwich Technique, and Group (III) Open Sandwich Technique without etching. All specimens were stored in artificial saliva for one week before thermocycling Microleakage at the gingival margin between the tooth structure and both glass ionomer liner and composite resin was assessed for the extent of dye penetration.