Color stability of dental resin modified glass ionomer (RMGI) has been a challenge to dentistry; therefore, systematic changes in 2-hydroxyethyl methacrylate (HEMA) content were performed experimentally to find an idea to enhance the color stability. Changes in color ( ΔEab*) and color coordinates (ΔL*, Δa* and Δb*) of experimental 10-50 wt pct HEMA-added dental glass ionomers (HAGIs) and corresponding RMGIs were determined after 5000 cycles of thermocycling. Color changes of HAGIs were not influenced by the HEMA content while ΔL*, Δa* and Δb values were in°uenced by the HEMA content. Color stability of 30% or 40% HEMA-added HAGIs was not different from those of the commercial RMGIs. Since the in°uence of HEMA itself on the color stability of HAGIs was limited, compositional modi¯cation to increase the color stability of these materials should be developed.
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