Tais Munhoz1, Yann Fredholm2, Pascaline Rivory3, Sandra Balvay4, Daniel Hartmann5, Pedro da Silva6, Jean-Marc Chenal7. 1. INSA de Lyon, Laboratory MATEIS, UMR CNRS 5510, Bâtiment Blaise Pascal, 7 Avenue Jean Capelle, 69621 Villeurbanne, France. Electronic address: tais.munhoz@insa-lyon.fr. 2. Noraker, 13 Avenue Albert Einstein, 69100 Villeurbanne, France. Electronic address: y.fredholm@noraker.com. 3. Université de Lyon, Laboratory MATEIS, UMR CNRS 5510, ISPB Faculté de Pharmacie, 7 rue Guillaume Paradin, 69372 Lyon, France. Electronic address: pascaline.rivory@univ-lyon1.fr. 4. Université de Lyon, Laboratory MATEIS, UMR CNRS 5510, ISPB Faculté de Pharmacie, 7 rue Guillaume Paradin, 69372 Lyon, France. Electronic address: sandra.balvay@univ-lyon1.fr. 5. Université de Lyon, Laboratory MATEIS, UMR CNRS 5510, ISPB Faculté de Pharmacie, 7 rue Guillaume Paradin, 69372 Lyon, France. Electronic address: daniel.hartmann@univ-lyon1.fr. 6. INSA de Lyon/INRA, Laboratory BF2I, UMR203, Bâtiment Louis Pasteur, 20 Avenue Albert Einstein, 69621 Villeurbanne, France. Electronic address: pedro.da-silva@insa-lyon.fr. 7. INSA de Lyon, Laboratory MATEIS, UMR CNRS 5510, Bâtiment Blaise Pascal, 7 Avenue Jean Capelle, 69621 Villeurbanne, France. Electronic address: jean-marc.chenal@insa-lyon.fr.
Abstract
OBJECTIVE: To prepare organically modified montmorillonite (OM MMT) and assess mechanical, physical, chemical and biological effects of its introduction into resin-composites. METHODS: Natural MMT clay was modified by a methacrylate functionalized quaternary ammonium intercalating agent. Interlayer distance was measured by X-ray diffraction. Dental composites were then prepared with x=0, 1, 2.5, 5 or 7.5wt.% of OM MMT, (75-x) wt.% of silanated barium glass and 25wt.% of methacrylate based matrix). Relative weight loss was measured and the effect of the substitution on mechanical properties was studied by dynamic mechanical analysis and hardness tests. Properties of resin composites were evaluated in terms of water sorption, light transmittance, biological tests and by high-performance liquid chromatography (HPLC). RESULTS: Resin based composites with well-dispersed organically modified MMT were successfully prepared. There were no significant weight loss differences shown by TGA within all samples. The DMA analysis showed that the introduction of clays have a beneficial effect in increasing the storage and elastic modulus of composites. Clay presence was shown to interfere with the blue light transmittance, affecting Vickers hardness and water sorption levels. The amount of released monomers measured from extracts was below expected levels for this type of materials and biological tests show satisfactory cell compatibility. SIGNIFICANCE: This paper reports the successful functionalization of MMT by a methacrylate group and further incorporation in experimental dental composites. Physical and biological results show a potential interest to the application of nanoclays into dental resin composites.
OBJECTIVE: To prepare organically modified montmorillonite (OM MMT) and assess mechanical, physical, chemical and biological effects of its introduction into resin-composites. METHODS: Natural MMT clay was modified by a methacrylate functionalized quaternary ammonium intercalating agent. Interlayer distance was measured by X-ray diffraction. Dental composites were then prepared with x=0, 1, 2.5, 5 or 7.5wt.% of OM MMT, (75-x) wt.% of silanated barium glass and 25wt.% of methacrylate based matrix). Relative weight loss was measured and the effect of the substitution on mechanical properties was studied by dynamic mechanical analysis and hardness tests. Properties of resin composites were evaluated in terms of water sorption, light transmittance, biological tests and by high-performance liquid chromatography (HPLC). RESULTS: Resin based composites with well-dispersed organically modified MMT were successfully prepared. There were no significant weight loss differences shown by TGA within all samples. The DMA analysis showed that the introduction of clays have a beneficial effect in increasing the storage and elastic modulus of composites. Clay presence was shown to interfere with the blue light transmittance, affecting Vickers hardness and water sorption levels. The amount of released monomers measured from extracts was below expected levels for this type of materials and biological tests show satisfactory cell compatibility. SIGNIFICANCE: This paper reports the successful functionalization of MMT by a methacrylate group and further incorporation in experimental dental composites. Physical and biological results show a potential interest to the application of nanoclays into dental resin composites.
Authors: Alef Vermudt; Milton Carlos Kuga; João Felipe Besegato; Eliane Cristina Gulin de Oliveira; Thaís Piragine Leandrin; Marcus Vinicius Reis Só; João Carlos Silos Moraes; Jefferson Ricardo Pereira Journal: Polymers (Basel) Date: 2022-09-26 Impact factor: 4.967