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Les résines composites fluides utilisées en odontologie : influence du taux de charges

Abstract : Conservative dentistry has undergone a genuine revolution, with the advent of adhesive dentistry and the development of resin composites combined with dental bonding. The emergence of flowable resin composites 20 years ago further expanded the treatment options open to dental practitioners. The appearance on the market of a large number of resin composites that differ in terms of their matrix type, along with the size and the proportion of the fillers incorporated, combined with a lack of information from manufacturers concerning the exact compositions of their products, means that practitioners do not really know all the characteristics of the materials they are using. In vitro hypercharacterization of these materials is an important approach to help us gain a better understanding of their properties. In order to assess the impact of variation of filler contents on the mechanical and physicochemical properties of flowable resin composites, we studied two groups of materials: a first group, composed of experimental flowable resin composites with the same matrix and a variable filler content, and a second group, composed of commercially available flowable resin composites. For each of these materials, after determination of the filler content using the calcination method, assessment of their rheological properties (complex viscosity and storage modulus), measurement of microhardness (Vickers microhardness), volumetric setting shrinkage using the glass slide deflection technique, dynamic thermo-mechanical analysis in flexure (storage modulus, loss modulus, damping factor), along with the water absorption and dissolution capacities (determination by thermal gravimetry differential following immersion in different media) are all factors potentially influenced by the said filler contents studied. While the filler content should clearly be one of the decision-making criteria used by practitioners given the influence it seems to have on both mechanical and physicochemical properties, it nonetheless appears that a high filler content is not, in itself, a sufficient guarantee that the material meets the optimum specifications for an ideal filling material. The use of deformulated flowable composite resins with a variable filler content makes it possible to assess the role of the dispersed phase. However, a parallel study of commercially available materials highlights the influence of the matrix type and the various monomeric entities included in the polymer structure.
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Stéphanie Jager. Les résines composites fluides utilisées en odontologie : influence du taux de charges. Autre. Université de Lorraine, 2016. Français. ⟨NNT : 2016LORR0053⟩. ⟨tel-01752244⟩

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