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Background: Glass ionomers have good biocompatibility and the ability to adhere to both enamel and dentin.
However, they have certain demerits, mainly low tensile and compressive strengths. Therefore, this study was done
to assess consistency and compressive strength of glass ionomer reinforced by different amount of hydroxyapatite.
Materials and Methods: In this study hydroxyapatite materials were added to glass ionomer cement at different
ratios, 10%, 15%, 20%, 25% and 30% (by weight). The standard consistency test described in America dental
association (ADA) specification No. 8 was used, so that all new base materials could be conveniently mixed and the
results would be of comparable value and the compressive strength test described by
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