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

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

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

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

STATEMENT OF PROBLEM: Shade selection has traditionally been accomplished by visual examination, which is particularly relevant to the shade selection of anterior teeth, but the subjective nature of visual analysis can lead to errors in shade matching. Recently shade selection systems have been developed to provide a more objective and scientific approach to understanding and clarifying shade selection. PURPOSE: The purpose of this study was analysis of various shade analyzing equipment with the goal of providing a more objective shade selection. Materials and method: Visual shade matching system selection(Vita Lumin Vacuum shade guide, Vitapan 3D Master shade guide) and mechanical shade matching method(ShadeEye (R) -EX Chroma Meter, ShadeScan(TM) System) used for this study. The shade guide tap specimens for 10 extracted maxillary anterior teeth were produced by selecting shades using each shade matching system. The accuracy of the selection of shades for the teeth and fabricated specimens were evaluated by analyzing the calculated shade difference(delta E*), using a spectrophotometer and calculating the output of value L*, a*, b*. RESULTS AND CONCLUSION: The results show that the average delta E* value (difference of shade) of the shade tap specimens to the actual specimen decreased in the following order: Vita Lumin Vacuum Shade Guide(VL), ShadeEye(R)-EX Chroma Meter(SE), Vitapan 3D Master Shade guide(V3), and ShadeScan(TM) System(SS); and that there are significant statistical differences between the VL and SS (p<0.05). In the analysis of the delta E* (difference of shade) value, 40% of the VL group was found to be less than 3.3 (limit value of shade tap specimens clinically acceptable), 60% in the V3 group, 50% in the SE group, and 80% in the SS group.
Dental Porcelain* ; Spectrophotometry* ; Tooth ; Vacuum

A new spectrophotometry was described for the simultaneous analysis of pseudoephedrine sulfate-Ioratadine combination. The derivative spectrophotometry dA/d values were read at zero-crossing point. Mean recoveries were found to be more than 98% for these compound in mixture. The procedure does not require any separation step and proven to be rapid, simple and accurate for determination of the mentioned sample or corresponding multi-component mixture
Spectrophotometry ; Ultraviolet Therapy ; Loratadine ; tablets

PURPOSE: To identify the most frequent natural tooth colors using the Easyshade Compact (Vita -Zahnfabrik) spectrophotometer on a sample of the Spanish population according to the 3D Master System. MATERIALS AND METHODS: The middle third of the facial surface of natural maxillary central incisors was measured with an Easyshade Compact spectrophotometer (Vita Zahnfabrik) in 1361 Caucasian Spanish participants aged between 16 and 89 years. Natural tooth color was recorded using the 3D Master System nomenclature. The program used for the present descriptive statistical analysis of the results was SAS 9.1.3. RESULTS: The results show that the most frequent dental color in the total sample studied is 3M1 (7.05%), followed by the intermediate shade 1M1.5 (6.91%) and 2L1.5 (6.02%). CONCLUSION: According to the research methodology used, and taking into account the limitations of this study, it can be proposed that the most frequent color among the Spanish population is 3M1; the most common lightness group is 2; the most frequent hue group according to the 3D Master System is M and the most frequent chroma group is 1.5.
Incisor ; Research Design ; Spectrophotometry* ; Tooth*