Mohamed Khalid Ebn- Elwaleed Diab, Manal Rafie Hassan And Mohammed Moustafa Shalaby,

ABSTRACT

Objectives: The Aim Of This Study Was To Assess The Effect Of Finishing Techniques On Translucency Of Two All Ceramic Materials (pressed Lithium Di Silicate And Yttrium Stabilized Tetragonal Zirconia). Methods: Sixty Discs Were Fabricated; Thirty Of Each Material Was Divided Randomly To Three Sub Groups According To Techniques Of Traditional Polishing, Auto Glaze And Add-on Glaze. All Of Discs Were Subjected To Aging Procedures Of Thermocycling & Subjected To Different Coloring Solutions That Mimic The Conditions Of Oral Cavities Tea, Coffee, Orange Juice, Lemon Juice And Cola . All Discs Were Subjected To Translucency Test Using Portable Intraoral Digital Spectrophotometer (Vita Easy Shade) Against Black & White Backgrounds For Comparison With The Respective Control Groups.

Results: Regarding To Polishing & Glazing Tests Was The Only Significant Test From The Three Way ANOVA (p Value 0.001). Pressed Lithium Di Silicate Discs Were More Translucent In All Subgroups With High Statistical Significance (P Value <0.001). Pressed Lithium Di Silicate Discs Were Non-significant Before And After Emersion In Coloring Solutions And Aging Thermo-cycling Test. (P Value 0.336). Yttrium Stabilized Tetragonal Zirconia Discs Was Non-significant Before And After Emersion In Coloring Solutions And Aging Thermo-cycling Test When Subjected To Auto Glaze. (P Value 0.586). Tetragonal Zirconia Discs Were Significant Before And After Emersion In Coloring Solutions And Aging Thermo-cycling Test When Subjected To Add-on Glaze (P Value 0.175) And Traditional Polishing (P Value 1). Conclusion: It Could Be Concluded From This Study, That Pressed Lithium Di Silicate Was The Material Of Choice When It Comes To Esthetics As It Was More Translucent Than Yttrium Stabilized Tetragonal Zirconia & It Was Resistant To Staining By Food And Drinks, More Over It Was Highly Resistant To Ageing As Proven By Thermocycling.