Mai Samy Sheta , Manal Ahmed El-Ebiary , Usama Mahmoud Abdel Karim, El-Refaie Kenawy And Hend Elkafrawy,

ABSTRACT


Purpose: The Purpose Of This Study Was To Evaluate The Effect Of Addition Of Different Percentages Of Zirconia And Silica Nanofiberson The Mechanical Properties And Bond Strength Of Conventional Glass Ionomer Cement (GIC).

Materials & Methods: In This Study Zirconia (ZrO2) And Silica (SiO2) Nanofiberswere Added In Different Percentages To Conventional Glass Ionomer Cement. This Study Included Control Group And Two Experimental Groups And Each Experimental Group Divided Into Two Subgroups; Group I: GIC Without Nanofibers(n=10) ?control Group?. Group II: GIC Reinforced With ZrO2 Nanofibers.Subgroup II A: 4% By Weight ZrO2 Nanofibers(n=10). Subgroup II B: 8% By Weight ZrO2 Nanofibers(n=10). Group III: GIC Reinforced With SiO2 Nanofibers.Subgroup III A: 4% By Weight SiO2 Nanofibers(n=10). Subgroup III B: 8% By Weight SiO2 Nanofibers(n=10). Compressive Strength, Indirect Tensile Strength, Microhardness, Surface Roughness And Shear Bond Strength Were Tested For All Groups.

Results: The Results Indicated That 8% ZrO2, 4%SiO2 And 8% SiO2 Nanofibersaddition Has Significantlyimproved Compressive And Indirect Tensile Strength. ZrO2 And SiO2 Nanofibersin All Percentages Tested In This Study Has Significantlyimproved Microhardness. Silica NanofibersmodifiedGIC Showed Significantlylower Surface Roughness. There Was No Significantdifference Between Shear Bond Strength Of Control And Tested Groups. Conclusion: Zirconia And Silica Nanofibersimproved The Mechanical Properties Of Conventional GIC. The Higher Percentages Of Nanofibers,the Better Improvement Of Mechanical Properties. Silica Nanofibersaddition To GIC Lowered Its Surface Roughness, While Zirconia Nanofiberdid Not Afffect It. Zirconia And Silica Nanofibers Addition To GIC Did Not Afect Its Adhesion To Dentine Surface.