IMPROVING THE MECHANICAL PROPERTIES OF GLASS IONOMER CEMENT

Mohamed Abdulmunem

doi:10.46903/gjms/23.3.1958

IMPROVING THE MECHANICAL PROPERTIES OF GLASS IONOMER CEMENT

Mohamed Abdulmunem

Abstract

Background: Glass ionomer cement (GIC) exhibits limitations such as low mechanical strength, poor fracture resistance, and limited durability, restricting its clinical applications. This study aimed to evaluate the impact of nano-hydroxyapatite( nHA) incorporation on the mechanical properties of GIC, focusing on tensile strength, fracture resistance, fatigue limit, and microhardness.

Materials & Methods: Study type is experimental , the research is done in faculty of dentistry, University of Almaarif, Alanbar, Iraq. All samples were collected and tested in a duration of two year (2023 to 2025). A total of 50 GIC formulations were prepared, divided into control (25 samples without nHA) and modified (25 samples with nHA) groups. Mechanical tests were performed to measure tensile strength, fracture resistance, fatigue limit, and microhardness. Data were analyzed statistically to compare the two groups .

Results: The modified GIC group exhibited significantly higher tensile strength (25.41 MPa vs. 20.21 MPa), fracture resistance (101.48 N vs. 84.15 N), fatigue limit (12,659 cycles vs. 8,095 cycles), and microhardness (62.80 VHN vs. 48.27 VHN) compared to the control group (p < 0.05 for all). Regression analysis highlighted tensile strength and fracture resistance as strong predictors of microhardness.

Conclusion: The incorporation of nHA significantly improved the mechanical properties of GIC, making it a promising material for dental restorations requiring enhanced strength and durability.

Keywords

Dental cements; Glass ionomer cement; Microhardness; Nano-hydroxyapatite; Tensile strength.

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References

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DOI: https://doi.org/10.46903/gjms/23.3.1958