Please use this identifier to cite or link to this item:
|Title:||Effects of incorporation of HA/ZrO2 into glass ionomer cement (GIC)|
|Citation:||Gu, Y.W., Yap, A.U.J., Cheang, P., Khor, K.A. (2005). Effects of incorporation of HA/ZrO2 into glass ionomer cement (GIC). Biomaterials 26 (7) : 713-720. ScholarBank@NUS Repository. https://doi.org/10.1016/j.biomaterials.2004.03.019|
|Abstract:||Glass ionomer cements (GICs) are a class of bioactive cements that bond directly to bone. In this paper, a new bioactive hydroxyapatite (HA)/zirconia (ZrO2)-filled GIC composite was developed to improve the biocompatibility and bioactivity of the GICs with the surrounding bone and connective tissues. Nano-sized HA/30wt% ZrO2 powders were heat treated at 700°C and 800°C for 3h to elucidate the influence of the crystallinity of composite powders on the performance of HA/ZrO 2-GICs. The effects of different volume percentages of HA/ZrO 2 powders (4, 12, 28 and 40vol%) substituted within GICs were investigated based on their microhardness, compressive strength and diametral tensile strength. The HA/ZrO2-GICs composite was soaked in distilled water for 1 day and 1 week before subjecting the samples to mechanical testing. Results showed that the glass and HA/ZrO2 particles were distributed uniformly in the GIC matrix. The substitution of highly crystalline HA/ZrO 2 improved the mechanical properties of the HA/ZrO2-GICs due to the slow resorption rate for highly crystalline powders in distilled water. The mechanical properties of HA/ZrO2-GICs increased with increasing soak time due to the continuous formation of aluminium salt bridges, which improved the final strength of the cements. The compositions 4 and 12vol% HA/ZrO2-GICs exhibited superior mechanical properties than the original GICs. The mechanical properties of HA/ZrO2-GICs were found to be much better than those of HA-GICs because ZrO2 has the attributes of high strength, high modulus, and is significantly harder than glass and HA particles. Furthermore, ZrO2 does not dissolve with increasing soaking time. © 2004 Elsevier Ltd. All rights reserved.|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Oct 12, 2018
WEB OF SCIENCETM
checked on Oct 2, 2018
checked on Sep 29, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.