ABSTRACT

Purpose: This research aimed to compare 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) each disc was tested for color stability. All discs were immersed in 4% acetic acid as a corrosive agent to study the effect of aging on color stability of glazed and polished ceramic.

Results: In terms of color stability (∆E), both glazed and polished subgroups of E-max samples exhibited statistically significant differences after corrosion, favoring the superior color stability of glazed over polished ones (p-value=0.001). Similar trends were observed in HTZ samples, with glazed samples demonstrating better stability (p-value=0.003). Additionally, when comparing glazed samples between E-max and HTZ, the HTZ group showed significantly better color stability (p-value=0.001). The same pattern was found in polished samples, favoring HTZ over E-max (p-value=0.001).

Conclusions: Corrosion of samples exerted a notable impact on the color stability of the tested Lithium Di-silicate (E-max) and High Translucent Zirconia (HTZ) ceramics, irrespective of the finishing techniques employed. The method of finishing played crucial roles, with glazed HTZ samples demonstrating the least susceptibility to corrosion in terms of color stability.