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Etude des endommagements interfaciaux de restaurations dentaires polymérisées

Abstract : Interface tightness, polymerization shrinkage, conversion rate, polymerization stress and corresponding C-factor, and water absorption/ solubility of three photo-polymerizable composite resins were evaluated in vitro. They included a condensable resin (Filtek P60), a fluid resin (Filtek Flow), both with their adhesive (Scotchbond 1), and an ormocer with its adhesive (Admira & Admira Bond). Polymerization was performed using a LED lamp in two continuous modes (20s and 40s), and in the exponential mode (20s). Tightness was evaluated using a dye penetration test (ISO 11405) and SEM analysis. The glass slide deflection technique was used to determine polymerization shrinkage. Polymerization stress was determined with a materials testing machine. Conversion rate was measured by Fourier Transform Infrared Spectroscopy, and absorption/ solubility was measured by the ISO 4049 test method. All materials with enamel interfaces were significantly better for tightness than were cement interfaces. Polymerization shrinkage was significantly different for all materials. The polymerization mode had a significant impact on shrinkage kinetics. Conversion rates and polymerization stresses were significantly different for all materials but were not affected by the polymerization mode. The decrease in factor-C reduced stress and stress kinetics. The different materials showed marked differences in absorption/ solubility.
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Eric Mortier. Etude des endommagements interfaciaux de restaurations dentaires polymérisées. Autre. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10011⟩. ⟨tel-01748493⟩

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