الفهرس 
Effect of aging on the color stability of stained dental monolithic ceramics
ContentOnly 14 pages are availabe for public view
 |  | from | 125 |  |  |
| | | from | 125 | | |
Abstract
With all the recent developments in dental ceramics, it has succeeded in enhancing the dental esthetics and fulfilling patients{u2019} demands. Together with the use of the CAD/CAM technology and monolithic ceramics blocks and blanks, it saved time for treatment visits and provided high quality restorations. However, as monolithic ceramics are formed of a single shade, the concept of ceramic staining was introduced in attempt of mimicking the natural tooth appearance. Nevertheless, the stability of these stains is still questionable when placed in the severe conditions of the oral cavity. Therefore, due to the limited number of researches discussing the stability of these stains, the aim of this study was to investigate the effect of aging on the color stability, translucency, surface roughness and hardness of stained monolithic ceramics. A total of 60 specimens were used in this study, which were divided into six groups according to the monolithic ceramics material used (n=10/ material). These materials represents the currently available all ceramic materials in the market such as (I) Mark II (II) Empress CAD, (III) e.max CAD, (IV) ZirCAD LT, (V) ZirCAD MT Multi and (VI) Suprinity. Each group was further divided into two subgroups based on the type of stain used, (subgroup A) IPS Ivocolor (n=5/ subgroup) and (subgroup B) Vita Akzent stain (n=5/ subgroup). The staining procedure was done in two step manner, where the stains were applied and fired followed by glazing and firing, as mentioned by the manufactures. Subsequently, the specimens of each subgroup were placed in separate beakers of 10 ml of 4% acetic acid for 16 hours at a temperature of 80{u00B0}C. The color change (xE) due to aging including all color coordinates and translucency parameter of all specimens were evaluated using the spectrophotometer. Whereas, the surface roughness was examined by using two different methods, the profilometry and atomic force microscopy. Scanning electron microscopy were also used to monitor the surface topography after aging