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Yoshioka L. Characterization of encapsulated glass ionomer cement and influence of acceleration of setting reaction on properties and bond strength to dentin In vitro study. [thesis] São Paulo: University of São Paulo, Faculty of Dentistry; 2019. Original Version. The Glass Ionomer Cement (GIC) is a restorative material widely used in dentistry. Despite presenting some advantages that benefit its use, there are some disadvantages, such as slow initial setting reaction. Aim: To evaluate the influence of setting reaction acceleration of encapsulated GIC on its biomechanical properties and to characterize GIC microstructure. Methods: For Flexural Strength (FS) and Knoop Hardness (HK) testing, 8 experimental groups were divided according to the encapsulated GIC (Equia Forte or Riva Self Cure), the type of initial setting reaction acceleration (capsule heating, ultrasound application or double technique), and the control group prepared without the influence of any external interference. The threepoint FS assay (n=10) was performed at a speed of 0.5mm/min. For HK (n=10), some indentations were done on the surface of the specimen using the Knoop Pyramid with a load of 25g during 30s. Data were analyzed with ANOVA and Tukey's test with significance level of 5%. GIC characterization was performed within the 3 groups, Fuji 9 Gold Label, Equia Forte and Riva Self Cure. Elemental chemical analysis was performed using the X-Ray Fluorescence (XRF) technique. The particle distribution analysis was carried out using laser diffraction. GIC powder weight was measured on an analytical scale. Microstructure image analysis and chemical microanalysis were performed in two ways for the 3 groups of GIC, only using the powder of each group and the surface of test specimens from each experimental groups (n=3). All samples were analyzed in Scanning Electron Microscope (SEM) at magnification of 100X, 1000X, 1200X and 4000X. The chemical microanalysis was performed at 1200X magnification using Energy Dispersive X-ray Spectrometry (EDS). Results: There were no statistically significant differences between the experimental groups of encapsulated GIC Equia Forte and Riva Self Cure in the FS and HK tests. The chemical analysis revealed that the elements Al2O3, SiO2 and F were present in a higher percentage in all GIC analyzed. Equia Forte presented predominance of larger particles, whose size was between 13.06μm and 66.61μm in 40% of the powder composition. Fuji 9 Gold Label displayed 40% of the particles size between 7.57μm and 26.06μm. Riva Self Cure presented smaller particles, whose size was between 4.90 μm and 23.64 μm in 40% of all particles. Conclusions: Initial setting reaction acceleration of encapsulated GIC does not influence the biomechanical properties evaluated. The chemical and microstructural composition of GIC particles act on the performance of glass ionomer cements, being possible even to accelerate its setting reaction.

Caracterização do cimento de ionômero de vidro encapsulado e influência da aceleração da reação de presa nas propriedades e resistência de união à dentina - Estudo in vitro