La porosité des résines composites utilisées en odontologie : étude de son origine et évaluation de son influence sur différentes propriétés

Abstract : For the past 60 years, dental resin composites have been constantly evolving, becoming increasingly functional and aesthetic materials. However, obtaining the ideal dental restorative material, with optimum mechanical and physicochemical properties, is still a significant challenge today. The nature and proportion of the monomers, the type, size and content of fillers, the quality of the bonds between the fillers and the matrix and the presence of porosities inside materials all emerge as aspects that can influence these properties. To improve our understanding of the impact of these various factors, a number of studies have been undertaken using three commercially-available resin composites with different viscosities: one high-viscosity resin (Filtek P60 – 3M ESPE), one moderate-viscosity resin (Grandio – Voco) and one low-viscosity resin (Filtek Supreme XTE – 3M ESPE). The influence of clinical handling of materials on the rate and volume of porosities has been evaluated by 3D X-ray computed tomography. Handling increases the porosity percentage and reduces the average porosity volume. Furthermore, the more flowable the material is, the more porosities it has within it. Two groups of samples were prepared in order to evaluate the influence of porosity on the mechanical and physicochemical behavior of materials: one group of samples consisted of materials simply extruded from syringes, while additional porosities were added artificially in the other samples. The polymerization stress was determined using a tensile testing machine, the absorption/solubility was measured in accordance with ISO 4049, the true tensile mechanical behavior was assessed using the VidéoTractionTM system, and the apparent compressive and flexural behaviors were studied using a compression test machine and a 3-point flexural test machine, respectively. The various organic and mineral components appear to be key elements in the physicochemical and mechanical behavior of materials. The initial porosity is also a predominant factor in terms of explaining this behavior. However, its influence is not proportional to its rate, since the addition of artificial porosities does not significantly affect the results
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Rémy Balthazard. La porosité des résines composites utilisées en odontologie : étude de son origine et évaluation de son influence sur différentes propriétés. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0209⟩. ⟨tel-01754474⟩

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