Universiti Sains Malaysia, Malaysia
Title: Hardness assessment of new modified glass ionomer cement nanosilica- hydroxyapatite-zirconia composite using one-pot technique
Biography: Wan Zaripah Wan Bakar
Glass ionomer cement is among the commonly used material in dentistry but has some limitation such as low hardness and wear resistance which has trigger researchers to modify its powder composition. One-pot synthesis method was used to prepare new nanopowder hybrids of nanosilica-hydroxyapatite-zirconia (nanoSi-HA-Zr). This new nanopowder hybrid was added into commercial available conventional glass ionomer powder (Fuji IX, GC, Japan) at weight percentages of 1%, 3% and 5% by spatulation at controlled grinding process to produce GIC-nanosilica- hydroxyapatite-zirconia (GIC-nanoSi-HA-Zr). Vickers hardness of the new composite were assessed and compared with the Fuji IX and GIC-nanoSi-HA (GIC-nanoSi-HA) hybrid. In general, results showed that the hardness of GIC-nanoSi-HA-Zr composite was higher than Fuji IX and GIC-nanoSi-HA composite. The highest hardness values recorded is at 3% addition for GIC-nanoSi-HA-Zr which is ~75 HV (±2.48) compared to ~51 HV (±4.45) Fuji IX and ~56 HV (±6.67) GIC-nanoSi-HA. It could be concluded that incorporation of nanozirconia significantly improves the hardness of conventional glass ionomer and also GIC-nanoSi-HA.