Abd El Azeem Mostafa Abd El Azeem And Cherif Adel Mohsen,

ABSTRACT
Background: Many Minimum Esthetic Problems Can Be Solved By Ceramic Laminate Veneer Restoring.AIM: The Aim Of This Study Was To Investigate The Effect Of Changing The Cement Space Measure On The Fracture Resistance Of Ceramic Laminate Veneer.

Materials and Methods: A Resin Central Incisor Model Was Reduced For Laminate Veneer. An Intraoral CAD/CAM Optical Scanner Was Used To Scan Resin Model. The Laminate Veneer Design Was Planned On The Scanned Preparation By CAD/CAM Software. Thirty Ceramic Laminate Veneer Samples Were Machined From Zirconia-reinforced Lithium Silicate Blocks With The Change Of The Cement Space Settings. The Samples Were Divided To 3 Groups According To Their Cement Space Parameters (CSP) (20, 60, 100 ?m) (n= 10). Thirty Epoxy Dies Were Duplicated From The Prepared Resin Model. Total Etch Resin Cement System Was Used To Cement The Ceramic Laminate Veneer Samples To Epoxy Dies. Each Epoxy Die Sample Base Was Fittedin A Specially Constructed Jig. A Compressive Load Was Applied On The Ceramic Laminate Veneer. The Load Required To Fracture Was Measured In Newton.

Results: The Highest Mean Value Was Recorded In G20 Group (582.06?124.81), Followed By G60 Group (528.07?61.24), With The Least Value Recorded In G100 Group (501.15?83.24). ANOVA Test Revealed No Statistically Significant Diference Between Groups (p=0.163).Conclusion: The Change Of Cement Space Volume Has No Effect On The Fracture Resistance Of Ceramic Laminate Veneers.