Color stability against accelerated aging of alumina- and leucite-based ceramic materials

Jing Cao, DDS, Hui-ming He, DDS, and Zhong-yi Wang, DDS

Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi’an,
P. R. China

Purpose: The purpose of the current study was to examine the effect of accelerated aging on color stability of the In-Ceram and Cergogold ceramic materials.
Materials and Methods: Ceramic samples with 1.0 mm in diameter and 1.5 mm in thickness were prepared in three commonly used shades. CIE Lab readings were recorded with a spectrophotometer prior to experiments and after 100-hour accelerated aging.
Results: The effect of ceramic type on the color change was similar for three shades (A1, A3, and A4). In-Ceram had less color change than Cergogold on every shade. When the shades of ceramic were compared, A1 shade had a greater color change than those of A3 and A4 shades (p<0.05).
Conclusion: Both In-Ceram and Cergogold ceramic materials had small color change with accelerated aging, although the changing was almost undetectable by human eyes. (Int Chin J Dent 2007; 7: 49-52.)

Key Words: accelerated aging, ceramics, color stability.