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International Poster Journal of Dentistry and Oral Medicine



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Int Poster J Dent Oral Med 20 (2018), No. 4     15. Dec. 2018
2nd Prize for Best original research category Int Poster J Dent Oral Med 20 (2018), No. 4  (15.12.2018)

Poster 1238, Language: English

Characterisation and Physico-Chemical Evaluation of a Novel Glass Ionomer Nano Zirconia- Silica- Hydroxyapatite Hybrid Material
Wan Bakar, Wan Zaripah / Sajjad, Arbaz / Mohamad, Dasmawati / Kannan, T. P.
Glass ionomer cement (GIC) is among popularly used materials in prosthodontics for core build-up and cementation of prostheses. A novel GIC-nano Zirconia- Silica- Hydroxyapatite (GIC-nano ZrO2-SiO2-HA) has been developed which has better hardness and aesthetics.
Aim: To characterisze and evaluate the fluoride release and colour stability of a new GIC-nano ZrO2-SiO2-HA hybrid material.
Materials and Methods: The nano ZrO2-SiO2-HA was synthesiszed using modified sol-gel technique, and the nanopowder was characterized using TEM and FTIR. Ten samples per group were prepared by adding 5% by weight of nano ZrO2-SiO2-HA powder into the conventional GIC (Fuji IX). The colour stability was measured with a spectrophotometer using the CIE L*a*b* system, and the fluoride release was measured using an ion- specific electrode (ISE) meter, over a one-month period. The data wereas statistically analysed using repeated measures ANOVA.
Results: TEM micrographs confirmed that all particles were in the nanoscale range with spherical ZrO2 and SiO2 particles embedded in the voids between rod-shaped HA crystallites. FTIR confirmed the presence of functional groups corresponding to each element. The statistical analysis demonstrated that the ΔE values for GIC-nano ZrO2-SiO2-HA were lower than for conventional GIC, indicative of greater colour stability, and fluoride release was significantly higher for all the time intervals (p<0.05).
Conclusion: The addition of nano ZrO2-SiO2-HA has improved the physico-chemical properties of GIC with greater colour stability and fluoride elusion, making it a potentially stronger anticariogenic aesthetic dental material for the future.

Keywords: Sol-gel synthesis, glass ionomer, hydroxyapatite, zirconia, fluoride release

Poster Award: 2nd Prize for Best original research category

11th Biennial Congress of Asian Academy of Prosthodontics (AAP2018)
20.-23. September 2018
Kuala Lumpur, Malaysia