Composites as a filling material has many advantages and is a now considered as most preferred tooth colored material for fillings. It has various components which are explained below:
Restoration of Lower Front Tooth with Composite Restoration
COMPONENTS OF COMPOSITES ARE:
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RESIN MATRIX
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FILLERS
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COUPLING AGENTS
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COLORING AGENTS
Composite Filling Material
RESIN MATRIX:
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Bisphenol glycidyl methacrylate(BISGMA)
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Urethane dimethacrylate (UDMA)
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Triethylene glycol dimethacrylate(TEGDMA)
The mixture of these three resins provides appropriate viscosity needed for binding of filler particles.
FILLERS:
These are quartz Silica Tricalcium phosphate and Zirconium dioxide
Addition of fillers provide
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Strength
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Rigidity
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Hardness
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Increase in modulus of elasticity
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Decrease in coefficient of thermal expansion
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Decrease in contraction.
COUPLING AGENTS:
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Organic silanes such as gamma-methacryloxy propyl trimethoxy silaneFunctions :- binds the filling particles to resin matrix
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Allow more flexible polymer matrix to transfer stresses to stiffer filler particles
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Provide hydrolytic stability by preventing the water from penetrating along the filler resin matrix.
COLORING AGENTS:
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Aluminum oxide
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Titanium dioxide in 0.001-0.007% by wt.