Color Stability Tests

Color Stability Tests

Dental restorative material has evolved to meet the aesthetic requirements of restorative dentistry. Today, many practitioners tend to use these attractive materials much more than they do in clinical practice. On this basis, the conservative nature of restorative techniques, minimal preparation requirements, shorter chair times and the diversity of materials available to dentists increase patient knowledge.

Although the excellent aesthetic properties and excellent biocompatibility of dental porcelain as an aesthetic material is undoubtedly notable, the fragile nature of ceramic materials and the great shrinkage that arose during the process raised questions and the trends had to use their modern polymeric / composite counterparts. Unfortunately, the tendency of gradual discoloration of polymeric dental materials over time is relatively high, and it is often necessary to change the entire restoration immediately after treatment.

Discoloration of resin-based restorations is considered a common obstacle in restorative dentistry. Many studies directly evaluated the color stability of resin composites; However, little is known about indirect / laboratory composite resins (ICRs). The purpose of this test is to compare the color stability of the two ICRs with a feldspathic porcelain after dipping.

Using a machine-made metal mold, each proposed material is fabricated with an 20 disk sample (10 mm diameter and 2 mm thickness). The discs were randomly divided into four groups. Initial measurements of EUROLAB metric parameters are performed in all samples with a spectrophotometer. The three groups are then subjected to a dipping process in different media (coffee, tea and cola) for 2 weeks. The last group 300 hours of aging is subjected to UV. Color coordinates and corresponding color changes are measured.


Under the limitations of this in vitro study, it was found that the color stability of commonly used ICRs was significantly affected by the staining materials used. Standard methodologies, such as those described in this article, can be very reliable for evaluating the clinical properties of ICR materials.

Single color difference value (total color difference)

It is a single value representing quantitative differences between L, a, and b values ​​of samples before and after testing. In both ICR samples, maximum color changes are made after dipping in coffee, changes after UV aging are looked for differences to a large extent. The changes in the valueE value for porcelain samples mostly occurred in the tea solution. Bidirectional indicates that the dipping medium and material type have a significant influence on the ΔE color value. The unidirectional also indicates that the immersion medium has a significant effect on ΔE values. The bidirectional statistical analysis results show that there is no significant relationship between changes in E color value on porcelain samples or UV-aging / cola / brown in SR-Adora. 

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