A resin blend was formulated containing 50:30:20 mass% bis-phenol A diglycidyl dimethacrylate, urethane dimethacrylate and triethylene glycol dimethacrylate (Esstech, Essington, PA, USA). 2,2-dimethoxy-2-phenylacetophenone at 0.1 mass%, and 2,6-di-tert-butyl-4-methylphenol at 0.5 mass% (SigmaAldrich, St. Louis, MO, USA), were used as the initiator and inhibitor, respectively. This formulation was similar to prior studies evaluating the addition of thiourethane to composite. [5 (link)] Ytterbium Fluoride fillers with average size of 0.11 μm (YBF100) and 0.05 μm (YBF402), and radiopaque Barium glass fillers with 0.80 μm were used in the study, and all fillers (Sukgyung AT. Co. Ltda, Ansa City, Korea) were almost spherical with a refractive index of 1.54. Fillers silanized using thiourethane or methacrylate were added at 40 mass% to the resin matrix.
Protocol detail
Resin Blend for Dental Composites
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Barium glass fillers
Di tert butyl methylphenol
Methacrylate
Phenol
Radiopaque
Resin
Triethylene glycol dimethacrylate
Urethane dimethacrylate
Ytterbium fluoride
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Variable analysis
independent variables
- Mass% of bis-phenol A diglycidyl dimethacrylate, urethane dimethacrylate and triethylene glycol dimethacrylate in the resin blend
- Filler type (Ytterbium Fluoride with average sizes of 0.11 μm and 0.05 μm, Barium glass with 0.80 μm average size)
- Filler surface silanization (thiourethane or methacrylate)
- Not explicitly mentioned
- Mass% of 2,2-dimethoxy-2-phenylacetophenone (0.1%) and 2,6-di-tert-butyl-4-methylphenol (0.5%) in the resin blend
- Filler refractive index (1.54)
- Filler shape (almost spherical)
- Positive control: Prior studies evaluating the addition of thiourethane to composite
- Negative control: Not mentioned
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