1) The nano-filled composites with relatively low filler weight, such as VITA LC, showed relatively poor wear resistance. The hybrid resin composite, with high filler weight and well filler distributions, such as Filtek P60, showed greater wear resistance. 2) Artificial saliva and cola can play an important role in lowering the friction coefficient and wear loss of dental composites.3) Abrasive wear is the main wear mechanism for the tested composites.
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