One micron is a critical fill size. Fillers larger than one micron can be seen through the human eye. When the resin matrix around the fill particles is eroded, the filler material becomes prominent and visible, so that the compound surface appears rough. Fillers less than one micron do not form a rough surface with aging. Macrophils greater than one micron are called microfilfillers, which are smaller than a micron to fillers. A new classification of filler is nano particles. The nanoparticles fill all other particles to further reduce shrinkage. Mixtures of different particle sizes are called hybrids. The distribution of flux particles can be uniformly or evenly distributed over a bell curve, so that a microfill composite may contain a plurality of particles larger than one micron, but the dominance of the particles is one micron or less. placed. The physical properties of the composites are improved by fillers, but their composite properties vary depending on the filler material, surface, size, load, shape, surface changers, optical index, filler load and size distribution. The fillers are classified according to material, shape and size. The fillers are irregular or spherical depending on the type of production. It is easier to incorporate spherical particles into a resin mixture and fill more space with less resin. One dimensional spherical particle occupies a certain area. Adding smaller particles fills the gap between larger particles to make more space. Less resin remains and therefore less shrinkage in curing of larger particles used in the correct dispersion.
Industrial composites use glass, kevlar, graphite, mica, wood, hollow glass spheres or the like to replace the resin. Dental composites require materials that are suitable for tooth color and translucency, so an optical index of 1.5 is required. Materials such as strontium glass, barium glass, quartz, borosilicate glass, ceramic, silica, prepolymerized resin or the like are used.
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