ABSTRACT

Purpose: This research aimed to compare translucency of lithium disilicate glass ceramic and high translucent monolithic zirconia using different finishing techniques and after being exposed to a corrosive medium.

Materials and Methods: Two main ceramic materials, Lithium Di-silicate (IPS e.max CAD LT A3, C14) and High Translucent Zirconia (HTZ) from DD BioZx2 A3-HT, along with acetic acid as a corrosive agent was employed in this study. Forty ceramic discs(10x12mm) were classified into two groups (20 discs each) according to the type of ceramic used then each group was subdivided into two subgroups (10 discs each) according to the finishing procedure (glazed and polished) then each disc was tested for translucency parameter. All discs were immersed in 4% acetic acid as a corrosive agent to study the effect of aging on translucency of glazed and polished ceramic.

Results: In terms of translucency parameter (TP), both glazed and polished subgroups of E-max samples exhibited statistically no significant difference after corrosion (p-value=0.149). Similar trends were observed in HTZ samples (p-value=0.853). Additionally, when comparing glazed samples between E-max and HTZ, Results showed that there was no statistically significant difference between both materials (E-max/HTZ) p-value=0.067. While for the polished samples there was statistically significant difference between both materials (E-max/HTZ) favoring the superior translucency of polished E-max samples over HTZ ones. p-value=0.029.

Conclusions: The translucency parameter (TP) of the studied materials is not significantly affected by the finishing procedure (mechanical polishing or glazing). But compared to glazing, mechanical polishing produced better translucency outcomes for the examined samples. Also corroded E-max exhibits superior translucency in comparison to HTZ.