Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:A7KAX9 (grit)
 1,275 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The objectives of this study were to evaluate the effect of surface conditions of dental resin composites on the measured color depending on the measuring geometry (SCE, SCI), and to determine the color difference (DeltaE*) caused by varied surface conditions. Color and surface roughness (Ra) of five brands of resin composites of A2 shade were measured after polymerization and polishing with 600-, 1000-, or 1500-grit SiC paper. Color was measured according to the CIE L*a*b* color scale. DeltaE* between different surface conditions was calculated by the equation DeltaE* = [(DeltaL*)(2) + (Deltaa*)(2) + (Deltab*)(2)](1/2). Before polishing, CIE L* values with the SCE were significantly lower than those measured with the SCI. Before polishing, DeltaE* values depending on the measuring geometry were very high (3.78-5.93). However, those after polishing were lower than 1.61. CIE L* values increased after polishing (p < 0.05) with the SCE; however, they were not changed with the SCI. DeltaE* values between Mylar-covered and 600-grit polished specimens were 4.20-5.99 with the SCE and 0.27-1.46 with the SCI. Measurement with the SCE geometry may result in accurate color determination, which reflects the surface conditions of dental restorative materials. DeltaE* values measured with the SCE between the specimens of different surface conditions were significantly higher than those with the SCI (p < 0.05).
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PMID:Effect of surface conditions on the color of dental resin composites. 1220 13

The objectives of this study were to evaluate the color difference depending on the surface topography of roughness and glazing, and to determine the effects of color measuring geometry and the standard illuminant on the color of a dental porcelain. Disk specimens of A3 shade were fired with commercial dental porcelain for PFM. Specimens were divided into non-polished (ST 1), polished with 200, 400, 1000, 1500-grit SiC papers (ST 2, 3, 4, 5) and glazed (ST 6) groups. After measuring the average surface roughness (Ra), color was determined under the illuminant A and D65 on a spectrophotometer with the specular component excluded (SCE) and included (SCI) geometry. Ra values were significantly influenced by the surface topography. With the SCE, the CIE L* value after glazing was significantly lower than that after polishing. Color differences (DeltaE*) measured with the SCE were higher than those with the SCI (2.61-4.66 vs. 0.93-1.57). Therefore the SCE geometry seemed to more accurate protocol for the color measurement of dental porcelain.
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PMID:Effect of surface topography on the color of dental porcelain. 1534 43