Conventional glass ionomer cement is one of the commonly used dental restorative material due to its properties especially bond to tooth structure and anticariogenic. However, their uses are limited due to some weaknesses such as low in mechanical strength. Many modifications have been done to improve it but not fully successful. Recently a group of researchers has proved that addition of hydroxyapatite, silica and zirconia able to enhanced the mechano-physico and aesthetic properties. 14. Wan

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... akar WZ, McIntyre J (2008) Susceptibility of selected toothcoloured dental materials to damage by common erosive acids. Aust Dent J 53 (3): 226-234. 15. Mallmann A, Ataíde JCO, Amoedo R, Rocha PV, Jacques LB (2007) Compressive strength of glass ionomer cements using different specimen dimensions. Braz Oral Res 21(3): 204-208.