Omar Elmahdi, Maged Elhakim And Lomaya Ghanem,

ABSTRACT
Statement Of The Problem: Many Studies Had Mentioned The Best Cementation Procedure And Surface Treatment Done To Lithium Disilicate E Max Crowns, However None Has Tackled The Cementation Of E Max With The New Bioactive Cement And Testing The Specimens Fracture Resistance. Aim Of The Study: Is To Evaluate The Effect Of Bio-active Cement On The Fracture Resistance Of E Max Crowns. Methodology: Teflon Bars Were Collected. Fifteen Teflon Molar Blocks Will Be Created From Teflon Bars, Five Blocks Will Be Unprepared And Ten Blocks Were Prepared To Receive Emax Crown. The Created Blocks Were Divided Into Three Groups (n=5). Group 1 (control Unprepared), And According To Cement Used Group 2 (conventional Glass Ionomer Cement) And Group 3 (bio-active Cement). Fracture Resistance Of All Samples Was Done Using Universal Testing Machine. One-way ANOVA Test Was Used To Compare Between The Three Groups. Bonferroni?s Post-hoc Test Was Used For Pair-wise Comparisons When ANOVA Test Is Significant. The Significance Level Was Set At P� 0.05. Statistical Analysis Was Performed With IBM? SPSS? Statistics Version 20 For Windows.

Results: There Was No Statistically Significant Difference Between Bio Active Cement Group And Glass Ionomer Cement Group. Conclusion: There Is No Influence Of The Cement Type Either Conventional Glass Ionomer Or Bio Active On The Fracture Resistance Of Posterior E Max Crowns.