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Restorative Materials (Main) (Composite Resin Micromechanical Adhesion …

- - - - Material
        
        Non-crystalline (Easier to polish)
        
        Glasses
        
        eg. Pyrogenic silicon dioxide
        
        Crystalline (Harder)
        
        Quartz
        
        Amorphous silica
      - Particle Size
        
        Traditional Macrofiller
        
        Radiolucent
        
        Quartz
        
        Microfiller
        
        Hybrids
        
        Midifills: small particle hybrid
        
        Minifills: Micro-hybrids
        
        Nanofills:
        
        Nanohybrids:
      - Loading : Vol / Weight
  - - - BisEMA
      - TEGDMA
        
        Properties
        
        Co-monomer (10% by weight)
        
        Improve plastification / flexibility
        
        Introduce cross-linking
        
        Difunctional Monomer :question:
        
        Diluent to attain high filler levels
        
        Reduce viscosity
        
        Extensive cross-linking
      - Bis-GMA
        
        Properties
        
        High molecular weight, size and chemical structure (dimethacrylate)
        
        High cross-linkage
        
        Colourless
        
        Very viscous :red_cross:
        
        Handling :check:
        
        Add low viscosity liquids like MMA/D3MA/TEGDMA :question:
        
        Hydrophobic
        
        Low volatility
        
        Relatively low polymerization shrinkage (5-6%)
        
        Polymerization inhibited by air
        
        Hardens rapidly in oral conditions
        
        Biocompatible
        
        Radiolucent
      - UDMA