Bonding Resin Composite To Two Different Types Of Resin Modified Glass Ionomer Utilizing Different Bonding Protocols

Abstract

This study was conducted to evaluate the shear bond strength and flexural strength of composite resin bonded to resin modified glass ionomer cement utilizing different bonding protocols. A total of 320 resin modified glass ionomer specimens were prepared in this study; 160 specimens for shear bond strength and 160 specimens for flexure strength. Each was divided into 16 groups (n=10) according to the three levels of the study; Level 1: type of glass ionomer (Fuji II LC or N100), Level 2: type of bonding protocol. Group 1: No adhesive was used (control group), group 2: self-etch adhesive only, group 3: self-etch adhesive and flowable composite, group 4: Flowable composite only). And Level 3: type of composite (Grandio composite resin, Grandio flow composite resin). For the shear bond strength test, specimens were prepared in a split teflon mold (6mm diameter x 2mm thickness). The surface of the filled mold was pressed with Polyester strip (Stripmat, Polydentia, Mezzovico, Switzerland) applied on the top of the specimen and then light cured for 20 seconds using LED curing unit. Prior to light curing of the adhesive, polyethylene tube (1.7mm diameter×2mm height) was placed over the uncured adhesive and each adhesive was cured for 10 seconds Composite was inserted inside the tube, Polyester strip (Stripmat, Polydentia, Mezzovico, Switzerland) was applied on the top of the tube and gently pressed to extrude the excess material. Light curing tip was placed directly over the polyester strip. The resin composite was cured for 20 seconds according tomanufacturer’s instructions.