An in vitro Prosthodontics Study on the Impact of Mouth rinses on the Color Stability of Monolithic and Multilayered Yttria –Stabilized Zirconia

The diverse array of restorative materials utilized in computer-aided design/computer-aided manufacturing (CAD/CAM) technology necessitates a comprehensive understanding of their aesthetic properties and color stability. This study aimed to evaluate the color stability of two different types of zirconia after immersion in Chlorhexidine and ANTIPLACA mouthwashes. We prepared 30 zirconia specimens (n = 15) as follows: Group 1 consisted of monolithic zirconia and group 2 consisted of KATANA™ YML Zirconia. Groups 1 and 2 were divided into three subgroups (n = 5). Each subgroup was immersed in one of the following three solutions: distilled water (control), CHX, or ANTIPLACA 0%Alcohol. We recorded the samples’ color values at baseline and after immersion according to the CIELab system by using a color spectrophotometer operated by an experienced operator. All data were collected and analyzed using Graph Pad Instat (Graph Pad, Inc.) software for windows. Irrespective of group totally it was found that immersion solutions significantly affected on mean values as revealed by two-way ANOVA test (p=<0.0001< 0.05) where (0% Alcohol > CHX ≥ DW). Mouthwashes staining had a marked effect on the color of the tested zirconia materials. The color change was material and staining solution-dependent, with Monolithic Zirconia showing the greatest color stability.