Evaluation of mechanical properties of dental composite resins

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  • コンポジットレジンの機械的性質
  • コンポジットレジン ノ キカイテキ セイシツ

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Abstract

<p>Composite resins are cured by mixing multifunctional monomers and silane-treated glass powder. Physical properties have been markedly improved by advancing the polymerization method and justifying the filler particle size and distribution. Among the physical properties, compression, diametral compression, and direct tensile tests are used to evaluate mechanical properties, but the three-point bending test may be the most practical. Thermal cycling is used as an accelerated degradation test for composite resins；however, storage in high-temperature water using a Soxhlet extraction device is also considered to be effective. Composite resin blocks for CAD/CAM are commercially available, but their flexural strength is decreased by immersion in water for 7 days and thermal cycling. Wear tests of composite resins showed that the amount of wear varied between two-body wear and three-body wear with poppy seeds and PMMA, and composite resin blocks for CAD/CAM generally showed less wear than those for restorative composite resins.</p>

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