Mechanical performance of a conventional glass ionomer cement by varying the powder: liquid ratio
DOI:
https://doi.org/10.21727/rpu.v16i2.4282Abstract
Introduction: Caries disease is one of the main public health problems that can cause great dental destruction. Atraumatic restorative treatment (ART) consists of selective removal of carious dentin with manual instruments and insertion of high viscosity glass ionomer cement (GIC). It is a technique of wide social reach and easy usability. To obtain similar behavior to high viscosity GIC regarding consistency, it is common for dentists to change the powder:liquid ratio of conventional GICs. The present study proposed to evaluate the impact on the compressive strength of a conventional GIC by varying the powder:liquid ratio. Materials & Methods: Were distributed 48 specimens in 4 groups (n=12): G1 - Maxxion R (MR) 1:1 (negative control), G2- MR (1.5:1), G3- MR (2:1) and G4- Vitro Molar 1:1 (positive control). The GICs were inserted in a cylindrical matrix of 6X4mm. After setting, the specimens were stored in an oven at 37ºC/24h and subjected to mechanical compression test in a universal testing machine with a speed of 1mm/min until the moment of failure. Results & Discussion: According to the ANOVA test, the G4 presented the highest mean of the compression test (26.8 MPa), followed by G3 (20.0), G1 (17.60) and G2 (15.5), p<0.05. The Tukey test showed statistically significant difference between G1 and G4; G2 and G4. Final Considerations: Based on the analysis of the results found and considering the limitations of this in vitro study, it was possible to infer that changing the powder:liquid ratio 1.5:1 (G2) reduced the mechanical resistance to compression of the conventional GIC.
Keywords: Dental Caries; Glass Ionomer Cements; Mechanical Tests.
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Copyright (c) 2025 Geovana A. Brum Lisboa, Ester de Lemos Guimarães, Letycia Gonzaga Fernandes, Tamires de Andrade Silva, Laísa Araújo Cortines Laxe, Vitória Celeste Fernandes Teixeira do Carmo
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