Mechanical Properties of Glass-Ionomer Cement Composited by ZrO۲ and CaMgSi۲O۶ in Submicron Particle Size: Their Acidic-Basic Behaviors in The Presence of Poly Acrylic Acid

Glass ionomer cements (GICs) are widely utilized in clinical restorative dental applications, which suffer from poor mechanical strength. Recent research shows that GIC achieves optimal performance when modified with lower percentage of filler materials, particularly when using nanoparticles, due to the resultant increase in surface area and packing density of the cement. Notably, while some modifications show promise, others fail to deliver improvements in material characteristics. This study addressed a gap in the literature by investigating the impact of acidic/basic additives, such as Diopside (CaMgSi۲O۶) and Zirconia (ZrO۲), on the properties of the cement. The reactivity of zirconia and Diopside differ distinctly from traditional calcium-aluminosilicate glass when exposed to acidic conditions in GICs. Also, to clarify the impact of acidity/basicity on filler reactivity during cement setting, the potential mechanical enhancement effects by using nano-sized particles is limited to submicrons. This research incorporated Diopside at concentrations of ۲, ۴, and ۶ wt.%, and zirconia at ۸, ۱۰, and ۱۲ wt.% into a glass powder component. Results demonstrated that adding ۸ wt.% Zirconia led to a ۴۹% enhancement in compressive strength, also improve microhardness by ۱۶ wt.%, attributed to its non-reactive nature, minimal dissolution, and high inherent strength of ZrO۲. In contrast, Diopside had a detrimental effect due to its basic nature compared to that of glass powder. These findings highlight the potential of zirconia as a valuable reinforcing material for the successful mechanical performance of glass ionomer cements. Conversely, basic fillers like diopside appear unsuitable for achieving improved mechanical performance in these systems.

کلیدواژه ها:

ZrO۲ ، Diopside ، Glass Ionomer Cements ، Mechanical Properties ، Dental Materials.