Hoda Mostafa Omar , Amira Farid Elzoghbi And Maha Abd.Elsalam Elbaz,

ABSTRACT
This Study Was Conducted To Investigate The Influence Of Self-etch Conditioning On Micro-shear Bond Strength Of Different Types Of Glass Ionomers When Used Underneath Nano Filled Composite Restoration Compared To Direct Application Without Surface Treatment.

Materials and Methods: In This Study, 15 Glass Ionomer Cement Base Material Discs Were Prepared Using A Specially Designed Cylindrical Teflon Mold. Moreover A Total Number Of 84 Specimens Were Prepared And Divided Randomly Into 3 Groups (28 Specimens Each), According To Type Of Glass Ionomer Base Materials Either Nano Glass Ionomer, Zinc Containing Or Conventional Glass Ionomer Cement Base. Each Group Was Further Subdivided Into Two Groups (14 Specimens) According To The Surface Treatment Protocol To Glass Ionomer Disc: Either No Surface Treatment Or Using Self-etching Adhesive. Micro-shear Bond Strength Test Was Performed Using Universal Testing Machine And Mode Of Failure Was Assessed Using Digital Microscope And Classified Either Adhesive, Cohesive Or Mixed. Two Way- ANOVA Used In This Study Showed A Significant Effect On Mean Micro-shear Bond Strength (?SBS) (Mpa) At P�0.001 For Different Glass Ionomer Cement Base Materials And Surface Treatments.

Results: Results Showed That Higher Value Was Obtained When Using Self-etching Adhesive System As Surface Treatment Protocol With All Types Of Glass Ionomer. Nano Glass Ionomer Gave Higher Results In Comparison With Zinc Containing And Conventional Glass Ionomer Cement Base Materials.