Synopsis HPLC separation and quantitative determination of aromatic quaternary ammonium compounds in cosmetic products by means of cation-exchange silica gel material and UV spectrophotometric detection.
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| http://dx.doi.org/10.1111/j.1467-2494.1987.tb00473.x | DOI Listing |
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Surface roughness of composite resins subjected to brushing with whitening toothpastes: an in vitro study.
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The emergence of toothpastes containing different abrasive and whitening substances has been a constant concern among dental professionals. The aim of the present study was to perform an in vitro assessment of the surface topography of nanoparticle composite resins subjected to simulated brushing with dentifrices. Test samples were prepared with Filtek Universal (3M ESPE), Filtek Bulkfill (3M ESPE) and Z350 (3M ESPE), with 24 samples per resin.
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