Effect of Mouth Washes on Hardness and Roughness of Lithium Disilicate and Zirconia Reinforced Lithium Silicate Ceramics; An In Vitro Study

AIM: The purposes of this study were to evaluate hardness, surface roughness and analysis the surface elements of lithium disilicate (LDS) and zirconia reinforced lithium silicate (ZLS) ceramics submitted to different mouth washes.MATERIALS AND METHODS: A total of sixty disc shaped samples (5mm diameter and 2mm thick) were fabricated of the two types of ceramic; 30 discs for group A, LDS (IPS e.max ceram) and 30 discs for group B, ZLS (VITA SUPRINITY). Each group were subdivided into 5 subgroups I-V (n=6) according to the type of immersion solution: distilled water, chlorhexidine based, povidone iodine based, green tea based and whitening mouth wash, for subgroups I-V respectively. Each sample was stored in 20 ml of distilled water which renewed daily for 90 days. For subgroups II-V samples were immersed with agitation in 10ml of fresh corresponding mouth wash solution for 1 minute/12 hours. All samples were evaluated quantitatively for hardness, surface roughness and Energy Dispersive Analytical X-Ray (EDAX) before and after immersion. RESULTS: All subgroups reveal statistically significant decrease in mean for hardness after immersion except for subgroup I. Subgroup I reveal the highest statistically significant mean comparing to other subgroups for both types of ceramics after immersion. Furthermore, all subgroups disclose statistically significant increase in mean for roughness after immersion except for subgroup I. Subgroup I reveal the lowest statistically significant mean compared to the other subgroups for group ICONCLUSION: Using mouth washes for 90 days affects surface properties of LDS and ZLS ceramics.