"Investigation of the Effect of Zirconia an‎d Diopside Additives on the Mechanical Properties of Restorative Glass Ionomer"

9/18/2025 12:00:00 AM

Abstract: Glass ionomer cements are widely used in various clinical applications of restorative dentistry. The aim of the present study was to investigate the effects of incorporating different weight percentages of synthesized diopside (CaMgSi₂O₆) an‎d commercially purchased zirconia (ZrO₂) with an approximate particle size of200 µm into glass ionomer cement, an‎d to eva‎luate their influence on its mechanical properties. For this purpose, glass powders based on SiO₂-Al₂O₃-SrF₂ an‎d SiO₂-Al₂O₃-CaF₂ were synthesized using the melting method. After characterization an‎d comparison of their mechanical properties, the calcium-containing glass ionomer cement was selec‎ted for further experiments due to its superior compressive strength an‎d hardness. Subsequently, diopside (DIO) particles with the chemical formula CaMgSi₂O₆, synthesized via the sol–gel process, were incorporated into the cement at different weight percentages of 2, 4, an‎d 6 as reinforcing agents. The results indicated that the mechanical properties decreased in the presence of this additive. On the other han‎d, the addition of zirconia at 8, 10, an‎d 12 wt% revealed a 23% increase in compressive strength an‎d hardness at 8 wt%, which was considered the optimal percentage for further investigation. Furthermore, the combined incorporation of 2 wt% diopside an‎d 8 wt% zirconia into the cement was eva‎luated, resulting in an improvement of compressive strength from 44.08 MPa (baseline) to 66.15 MPa. The elastic modulus also increased from 743 MPa to 1008 MPa, an‎d hardness rose from 74.44 HV to 100.57 HV compared to the base sample. These improvements are likely attributed to pore filling, crack growth inhibition, an‎d partial surface area enhancement, which collectively promote stronger bonding with the polymeric matrix, thereby enhancing the overall mechanical properties.

گلس آيونومر , ديوپسايد , زيركونيا , خواص مكانيكي گلس آيونومر , كو پليمر مالئيك اسيد آكريليك اسيد

Glass ionomer , diopside , zirconia , mechanical properties of glass ionomer , maleic acid–acrylic acid copolymer

Mohaddeseh reyhani

Hamid reza rezaei