Angel W. Habib , Moustafa N. Aboushelib And A.Nour A. Habib,

ABSTRACT

Objectives: To Study The Effect Of Aging On The Surface Roughness And Surface Hardness Of Stained Different Dental Ceramics.

Materials & Methods: Six Different All Ceramic Substrates (n=10/material) Mark II, Empress CAD, E.max CAD, ZirCAD LT, ZirCAD MT Multi And Suprinity Were Used. The Ceramic Materials Were Stained With Either IPS Ivocolor (n=5/material) Or Vita Akzent Stain (n=5/material). Aging Was Done According To ISO 6872. The Surface Roughness (Ra) Was Evaluated Using Profilometer, While The Surface Microstructure Was Examined Using Scanning Electron Microscopy (SEM). The Surface Hardness Was Measured Using Vicker�s Hardness Test. All These Tests Were Performed Before And After Aging. The Two-way ANOVA Tests And Bonferroni�s Post-hoc Test Were Used For Statistical Analysis.

Results: Aging Had Significantly Increased The Surface Roughness (?Ra) In All Specimens. The SEM Images Supported These Results As It Showed Scratches And Pitting Of The Surface. Aging Also Significantly Decreased The Surface Hardness, However ZirCAD LT When Stained With IPS Ivocolor And ZirCAD MT Multi And E.max When Stained With Vita Akzent Showed Significant Increase.

Conclusions: Aging Had Significantly Affected The Surface Roughness And Hardness Of The Stained Monolithic Ceramics.