Surface topography and color changes of recent glass ceramics after acidic media exposure

Author : Fatma Makkeyah

Abstract :Objective: To investigate the changes induced by two acidic beverages on the surface topography and color stability of two widely used computer-aided design/computer-aided manufacturing (CAD/CAM) ceramic materials. Materials and Methods: Sixty samples of two CAD/CAM ceramic materials, lithium disilicate (IPS e-max CAD) and zirconia-reinforced lithium silicate (Vita Suprinity), were fabricated in accordance with the manufacturer's specifications. The samples were submerged in one of three media (fake saliva, orange juice, and H3PO4-containing carbonated beverage) and thereafter incubated at 37 °C for 24 hours. The surface roughness (Ra) of the samples was evaluated using a profilometer before and after immersion in various media, while color characteristics were quantified using the VITA Easyshade Advance 4.01. Surface topography was examined utilizing a scanning electron microscope (SEM), and the surface mineral composition was analyzed pre- and post-immersion. The results were analyzed using paired sample t-test to determine the change in Ra before and after immersion. The effect of materials and immersion media on the mean ΔRa and mean ΔE was analyzed using tTwo-way analysis of variance. Tukey’s honest significant difference posthoc test was used for multiple comparisons at a level of significance (α<0.05). Results: immersion in the two investigated acidic media resulted in a significant increase in Ra and a decrease in the color stability of the two ceramic materials compared to artificial saliva. SEM and energy-dispersive X-ray results showed changes in the matrix of the ceramic material and the exposure of silicate crystals. Conclusion: The pH of different acidic media affects the surface topography and color stability of glass ceramics

Keywords :CAD/CAM ceramics, lithium disilicate, zirconia-reinforced lithium silicate, Ra, ΔE Acidic beverages, surface roughness, color stability, SEM, pH effect, dental materials

Conference Name :International Conference on Dental Science and Dental Health (ICDSDH-25)

Conference Place Budapest, Hungary

Conference Date 18th Jul 2025