“Effect of Different Storage Media on the Surface Roughness and Color Stability of two CAD/CAM materials” (An In-Vitro Study)

Abstract

The importance of esthetic dentistry was increased by the introduction of improved and new restorative materials (Ceramics and Hybrid ceramics). The promising results in restorations’ esthetics, biocompatibility, better strength and smoothness - which lead to better plaque control- all made ceramics a popular restorative material. Color reproduction and its stability is an important point in having a long-term successful restoration. To maintain color stability and stain resistance of ceramic restorations; glazing before final cementation must be achieved and for other types only polishing according to manufacturer’s instructions is done. On the other hand; rough surfaces are not an advantage as it affects the color of the restoration and increases extrinsic staining consequently to reduced amount of reflected light after surface roughness occurred. As a result; both color and surface roughness of ceramic restorations are very important factors to ensure a long term esthetically-accepted, successful restoration. Therefor in this study color and surface roughness are measured after thermocycling to mimic oral environment and storing in different storage media. A total number of forty-two specimens were prepared divided into 2 groups: Group I, IPS e.max CAD with total number of twenty-one specimens and Group II, Cerasmart CAD/CAM block with total number twenty-one specimens, both materials were A3 shade and cut to 1.5 mm by low speed diamond saw isomet 4000* with water coolant. Each group was divided into three subgroups each of 7 specimens and each subgroup immersed in different storage media. Subgroup 1 in instant coffee, subgroup 2 in citric acid and subgroup 3 in Artificial Saliva. Consequently, in this study it was found that; storing in instant coffee, citric acid and artificial saliva had no significant difference on surface roughness of IPS e.max CAD and Cerasmart. However; the storage media had a significant difference on color changes of both group, all have clinically accepted ΔE except for Cerasmart