Four calcined alumina abrasive particles [ultrafine (0.05 ?m), 3 ?m, 9 ?m and 20 ?m] with defined sizes were investigated for their effects on toothbrush abrasion, surface polishing stain removal in vitro . The existence of a critical particle size (CPS) was shown the first time tooth model system present study CPS ~2.3 d10, 4.3 d50 or 7.8 d90 abrasives apparent. values indicate that 10%, 50% 9...

in this paper, after collecting the rock samples from eight mines and one high way slope, the tests for determination of dry density, uniaxial compressive strength, tensile strength (brazilian test), elastic modulus, schmidt hammer rebound number have been done on samples. in addition, in order to calculating the mean size of rock grains, quartz content, hardness and abrasivity, a thin sections...

This in vitro study evaluated the biocompatibility and abrasivity of whitening conventional toothpastes. Samples (non-whitening) - Edel White Infant (EWI) toothpastes Whitening (EWW), CAREFORTE (EWC), Colgate Total 12 Ò Professional (C), Oral-B (OB) were dissolved culture medium (0.2 g sample weight per mL). Human gingival fibroblasts (hGF) placed contact with different dilutions media that had...

Objective: Tocompare the effect of tooth brushing on surface roughness Resin-Modified Glass Ionomer Cement (RMGIC; GC Gold label 2LC Light Cured Universal Restorative) and Hybrid (GH; EQUIA SYSTEM- Forte™ Fil Coat) restorative material at 1- 3-months interval simulated by brushing. Material Methods: RMGIC GH specimens (20 each) were prepared according to manufacturer instructions in 10mm × 2 mm...

CP Ti was mirror-polished and then abraded with waterproof SiC papers of two different grit sizes: 16 and 3 microm. As-polished and abraded surfaces were characterized by means of EPMA, XPS, XRD, and hardness test. Oxygen in the mirror-polished surface was uniformly distributed at the lowest level. Comparatively, abrading with SiC papers increased the surface oxygen amount and hardness. Owing t...