Simulation of naturally appearing enamel in fixed prosthodontics could be achieved with all ceramics. The purpose of this study was to investigate the stain resistance of 4 different all ceramics materials (In-ceram, IPS Empress, Celay, Vintage). Forty specimens were prepared using manifacture´s instruction and the samples were divided into two groups. The specimens for one group were glazing and those for other group were ground to remove the glazing layer. All specimens were immersed in methylene-blue for 24hours.The color values for each specimen was -measured. with colorimeter (Mode Tc-6Fx, Tokyo Denshoku Co.) prior to and after immersion in methylene-blue.
The following conclusions were drawn from this study.
1. The stain resistance of glazing ceramics was higher than that of unglazing ceramics.
2. The changes of LIES and L` values were revealed in Vintage and unglazing Celay. 3. The changes of a` values were revealed in ,.nglazing vintage, Celay, In-ceram.
4. The changes of b´ value were revealed in Vintage, IPS Empress and unglazing Celay.
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