The chrome content of 8 Korean cements and 11 Korean bleaching detrgents was analyzed by the qualitative DPC method and the quantitative atomic absorption spectrophotometry and UV-visible spectrophotometry. In cements, there was no detectable chrome in 1 sample and the range of chrome content in other 7 samples was 1.32 5.29ppm. The qualitative result was welJ. correlated with the quantitative result. In bleaching detergents, there was no detectable chrome in 4 samples and the range of chrome content in other 7 samples was 0.0329 0.362ppm. However, the qualitative result was not correlated with the quantitative result.
Detergents* ; Spectrophotometry ; Spectrophotometry, Atomic

No abstract available.
Spectrophotometry, Atomic*

The Atomic Absorption Spectrophotometry method for quantifying the lead and copper content of some herb products containing Panax pseudoginseng was reported. The proposed process of analyzing, using Graphite Furnace Atomizing Mode, were applied for 5 randomly selected samples and proved to be accurate. Results: Lead calibration curve: standard solution have exact lead concentrations of 10, 20 and 30ng/ml in 2% nitric acid. Copper calibration curve: standard solutions have exact copper concentration of 5, 10 and 20ng/ml in 2% nitric acid. Both techniques for decomposition of samples, wet ashing and microwave can be used in preparation of sample solutions
Spectrophotometry ; Panax

Investigating UV absorption spectrum of paracetamol (5µg/ml, solvent HCl 0.1N) and quinine sulfate (4µg/ml, solvent HCl 0.1N) of antigrip F tablet within the range 200nm to 400nm with HCl 0.1N solution as blank sample showed that: At wavelength 340nm, paracetamol did not absorb, which was not influence to analyze method. The comparison between MCA and normal spectrum method showed that the difference was not statistical significantly α = 0.05 (compared 2 variances, F test, mean values). The advantages of MCA method are rapid, accurate, and solvent-saving. For mixture containing two above ingredients, the content of each formulation’s ingredient can be simultaneous and accurate assayed by measuring absorption level of 4 wavelengths on normal spectrum machine
Spectrophotometry ; Acetaminophen ; Quinine

On basis of colour reaction of artersunate with hydroxylamine hydrochloride in alkaline medium and then with ferric chloride solution in acidic medium, a method for assay of artersunate in tablets is proposed. The results of the determination are validated and they show that the method is precise, accurate, linear in studied range and relatively specific. While there is no more specific method, this method may be applied in determination of artersunate in tablets in place of current methods.
Artersunate ; spectrophotometry ; tablets

PURPOSE: The aim was to study the masking ability of high-translucency monolithic zirconia and provide guidance in selecting resin luting cements in order to mask discolored substrates. MATERIALS AND METHODS: 160 high-translucency zirconia specimens were divided into 32 groups depending on their thickness and shades. Using five shades of try-in paste, the specimens were luted onto the sub strates (Co-Cr, precious-metal, opaque porcelain-sintered Co-Cr, opaque porcelain-sintered precious-metal, and 5M3-shade zirconia). All CIELAB color parameters were measured and statistically analyzed. RESULTS: Zirconia shade and thickness and try-in paste shade affected CIELAB color parameters (P=.000) in different substrates groups, and there were interactions among these factors (P=.000). All five try-in paste shades can be chosen to achieve ΔE values of zirconia with 1.2 – 1.5 mm for masking dark-tooth-like 5M3-shade and zirconia with 1.5 mm for masking precious-metal groups < 2.6. Only suitable try-in paste shades were used, can ΔE values that less than 2.6 be achieved when applied translucent monolithic zirconia with 0.7–1.0 mm for masking dark-tooth-like 5M3-shade and zirconia with 0.7 – 1.2 mm for masking precious-metal groups. CONCLUSION: Choosing suitable resin cement shades is necessary for high-translucency monolithic zirconia to achieve ideal masking ability (ΔE < 2.6) on the dark-tooth.
Masks ; Resin Cements ; Spectrophotometry

This experiment was performed to investigate the response of inorganic substances in alveolar bone in relation to the experimental tooth movement. Right canine in maxillary jaw was tipped in cats by coil springs generating 80 gm. force, in mandibular jaw, the force was 100 gm. force. Cats were divided into five groups and orthodontically treated for one hour, 1, 7, 14 and 28 days, respectively. Alveolar bone samples were obtained from tension and compression sites as well as from contralateral control sites. The level of calcium of alveolar bone was determined by atomic absorption spectrophotometry and inorganic phosphorus was measured by spectrophotometry. The results obtained were-as follows: 1. In tension and compression site of maxillary alveolar bone, calcium levels were decreased at 1, 7 and 14 days, but recovered at 28 days. 2. The levels of inorganic phosphorus in compression site of maxillary alveolar bone had little change but in tension site of maxillary alveolar bone,, phosphorous levels were decreased. 3. Calcium levels in tension and compression site of mandibular alveolar bone were decreased, especially at 28 days. 4. In tension and compression site of mandibular alveolar bone, inorganic phosphorus were slightly decreased from I day.
Animals ; Calcium* ; Cats* ; Jaw ; Phosphorus ; Spectrophotometry ; Spectrophotometry, Atomic ; Tooth Movement

OBJECTIVETo study the distribution of the chromatic value of gingival porcelains.

METHODSThe color change of Shofu VINTAGE and Vita VMK95 gingival porcelains on the black and white backings was determined with a spectrophotometer (PR-650).

RESULTSThe results showed that the chromatic value of gingival porcelains was different on varying backings. The color space of gingival porcelain was L*: 41.85 - 50.64, a*: 12.46 - 19.46, b*: 1.33 - 4.62.

CONCLUSIONThe chromatic value distribution cannot cover the color region of natural gingiva.

Barium ; urine ; Spectrophotometry, Atomic ; methods

OBJECTIVETo measure the translucency parameter (TP), masking effect (ME), and contrast ratio (CR) of opal porcelain of Ceramco, Shofu, Noritake, and Vita, and to compare the correlations among the three transmission parameters, in order to provide reference for selecting opal porcelain correctly.

METHODSThe color of specimens was measured according to CIE L*a*b* under different background and reflectance mode with a Color-Eye 7000A spectrophotometer. The color difference, TP, and ME value were calculated. Within 400-750 nm spectra, the ratio of light reflectance was measured, and CR was also calculated. The data was compared by ANOVA and SNK-q test (alpha=0.05). The correlation and multiple linear regression between TP, CR, and ME were analyzed (alpha=0.05).

RESULTSThere were statistical difference with different shade of the same brands (P<0.05). The correlations between ME and TP, TP and CR, ME and CR were existed (P<0.05). TP was correlated not only with ME but also with CR based on multiple regression analysis (P<0.05). The partial correlation coefficients were statistically significant (P<0.05). CR was the main devotion to translucency parameter on multiple regressions.

CONCLUSIONIt is recommended to select opal porcelains based on transmission parameters. CR value has an inner significance of opaque property of opal porcelain and can express opacity property of opal porcelain more appropriately than ME.