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Master Thesis

Effet du vieillissement thermique sur les propriétés mécaniques de 2 ciments verres ionomères à haute viscosité : tests de microdureté et de compression

Abstract : Glass Ionomer Cements (GIC) are biocompatible and bioactive restaurative materials due to fluoride release. They can naturaly bind to dental tissues but have poor mechanical properties. High-viscosity GIC (HV-GIC) are conventional GIC with inhanced mechanical properties. Aims : The objectives of this study were to evaluate and compare the effect of thermocycling (artificial thermal aging) on Vickers microhardness (MH) and compressive strength (CS) of two HV-GIC, as well as the CS of a two-layer system (combination of a flowable GIC and a HV-GIC) and a one-layer system (fluid GIC or HC-GIC only).
Material and method : Two HV-GIC (Equia ForteTM HT (EF) by GC ; IonoStar PlusTM (IS) by VOCO) and a flowable GIC (Fuji TriageTM (T) by GC, control) were formed as samples (26 plots of 5/2mm for MH ; 10 cylinders of 4/6mm for CS) and were divided in 2 categories (t0 = without thermocycling ; t5000 = 5000 thermal cycles) before being tested (13 plots and 5 cylinders for each group). Moreover, the CS of two-layer samples (EF+T) were compared to one-layer samples (EF or T only). Statistical analysis was made with a Wilcoxon-Mann-Whitney test.
Results : Thermocycling significantly improves MH values for all materials, mostly for IS, but has no significant effect on CS. MH and CS values of EF are significantly higher that IS without aging, but are equivalent at t5000. The two-layer system is superior to T and inferior to EF, at t0 and t5000. Conclusion : GIC have a slow maturation that can take up to several months. Thermal aging seems to accelerate this process in the lab. The results show that at the begining of maturation, EF has superior properties than IS, but are statistically equivalent after thermal aging. The CS mean of the two-layer system has an intermediate value between the CS of T and EF.
Document type :
Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-03046703
Contributor : Bibliothèque Universitaire de Médecine Nice <>
Submitted on : Tuesday, December 8, 2020 - 3:12:25 PM
Last modification on : Saturday, March 20, 2021 - 3:10:44 AM

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  • HAL Id : dumas-03046703, version 1

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Sacha Koskas. Effet du vieillissement thermique sur les propriétés mécaniques de 2 ciments verres ionomères à haute viscosité : tests de microdureté et de compression. Médecine humaine et pathologie. 2020. ⟨dumas-03046703⟩

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