منابع مشابه
Thermogravimetric analysis of waxes.
Differential thermal analysis and calorimetric analysis of commercial and dental waxes have been reported in the dental literature."2 Thermogravimetric analysis is described in most textbooks on thermal analysis3-5 and is essentially a method of measuring the weight of a sample as a function of temperature or as a function of time at a fixed temperature. The purpose of this study was to examine...
متن کاملCalorimetric analysis of commercial and dental waxes.
Dental waxes are often a blend of several waxes that are necessary to develop the most desirable qualities. In general, more information is available on physical properties and manipulation of dental waxes than on the composition or nature of the ingredients. Since heats of transition are fundamental in characterizing the chemical nature of matter, this information was obtained from waxes and b...
متن کاملDetermination of Coal Rank by Thermogravimetric Analysis
INTRODUCTION The thermogravimetric analysis patterns of coals and their residues reveal subtle differences between coals and changes which occur during the processing. It is the purpose of this paper to call attention to some of the various processes occurring during the TG analysis, and to show how these patterns can be interpreted in terms of changes or differences in coal structure. It is al...
متن کاملThermal analysis of dental impression waxes.
Ten dental impression waxes were characterized by penetration and differential thermal analysis. Penetration and initial transition temperatures were directly correlated. Penetration at 37 C ranged from 2.5 to 22% for bite waxes and was 100% for corrective waxes. Distortion of an impression wax may occur upon removal from the mouth.
متن کاملCharacterization and analysis of waxes by differential thermal analysis.
The characterization of waxes by differential thermal analysis is described. An endothermic peak at 475-480 degrees is characteristic of microcrystalline and polyethylene waxes, and measurement of its area provides a method for the estimation of these waxes in mixtures.
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ژورنال
عنوان ژورنال: Journal of Dental Research
سال: 1971
ISSN: 0022-0345,1544-0591
DOI: 10.1177/00220345710500025601