Thiourethane filler functionalization for dental resin composites: Concentration-dependent effects on toughening, stress reduction and depth of cure
Autor: | Maria Carolina Guilherme Erhardt, Jonas de Almeida Rodrigues, Carmem S. Pfeifer, A.P.P. Fugolin, S.H. Lewis, Marcelo Moraes Goulart |
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Rok vydání: | 2021 |
Předmět: |
Materials science
Surface Properties Bioengineering 02 engineering and technology 010402 general chemistry Methacrylate Composite Resins 01 natural sciences Article Polyethylene Glycols Biomaterials chemistry.chemical_compound Fracture toughness Polymethacrylic Acids Materials Testing Bisphenol A-Glycidyl Methacrylate Composite material Silanes 021001 nanoscience & nanotechnology Silane UDMA 0104 chemical sciences Polymerization chemistry Mechanics of Materials Silanization Methacrylates Surface modification 0210 nano-technology |
Zdroj: | Mater Sci Eng C Mater Biol Appl |
ISSN: | 0928-4931 |
Popis: | Objectives The aim of this study was to modify the surface of fillers used in dental composites by the synthesis of two novel thiourethane oligomeric silanes, used to functionalize the silica-containing inorganic particles. Several thiourethane silane concentrations were tested during the silanization process to systematically assess the effect of silane coverage on experimental composite conversion, polymerization stress and fracture toughness. Materials and methods Two different thiourethane silanes were synthesized based either on 1,6-hexanediol-diissocynate (HDDI), or 1,3-bis(1-isocyanato-1-methylethyl) benzene (BDI). Conventional 3-(Trimethoxysilyl)propyl methacrylate was used as the control. Glass fillers were silanized with 1, 2 or 4 wt% of each thiourethane silane, then evaluated by thermogravimetrical analysis. Photopolymerizable resin composites were prepared with Bis-GMA/UDMA/TEGDMA and 50 wt% silanized glass filler. Polymerization kinetics and degree of conversion were tested using Near-IR. Bioman was used to test polymerization stress. Data were analyzed with two-way ANOVA/Tukey's test (α = 5%). Results The mass of silane coupled to the filler increased with the concentrations of thiourethane in the silanizing solution, as expected. Thiourethane-containing groups exhibited significantly higher degree of conversion compared to control groups, except for BDI 4%. HDDI 4%, BDI 2% and BDI 4% showed significantly lower polymerization stress than control groups. HDDI 4% exhibited significantly higher fracture toughness. Conclusions and clinical significance Novel filler functionalization with thiourethane silanes may be a promising alternative for improving dental composites properties by significantly increasing the degree of conversion, fracture toughness and reducing the polymerization stress. |
Databáze: | OpenAIRE |
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