SYNOPSIS IN INTERLINGUA REACTIONES DE FLUORURO STANNOSE CON CERTE COMPOSITOS INORGANIC.—Le hic-reportate studios del chimia de SnFl concerneva su reactiones con varie cationes, incluse Ba, Ca, Na, e St e altere species que exerce un distincte effecto in le pH. Le concentrationes de solubile iones stannose e fluoruric esseva determinate in liquido supernatante de suspensiones de 0,4 pro cento de SnFl, e iste compositos inorganic esseva studiate como function del tempore. Compositos que augmentava le pH o que provideva un cation que forma un fluoruro insolubile reduceva le concentration de solubile iones stannose. Le concentration de solubile iones fluoruric non esseva un function del pH.

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Baths containing molten metal,' heated salt,2 glass beads,3 or steel balls4 have been suggested for sterilization of root-canal instruments. The principle involved is a simple one: application of sufficient heat to the instrument to cause rapid destruction of bacteria with as little damage as possible to the instrument.Two questions must be answered in evaluating the usefulness of these well-type sterilizers containing a hot, dry medium: Does the bath heat the inserted instruments to sterilizing temperatures, and does it heat them in a time interval short enough to make the use of the bath practical?A 10-second exposure to the temperature range 213°-2180 C. (415'-424' F.) has been found to render root-canal instruments sterile, at least with respect to nonsporulating organisms.3 In bacteriological tests with a molten-metal sterilizer, Stewart and Williams5 found that wet and dry instruments, paper points, and cotton pellets were sterilized in 2 seconds at 218°-226°C. (424°-439' F.). However, paper points contaminated with Stapkylococcus aureus and spores of Bacillus globigii required a 10-second exposure at these temperatures for sterilization. Other bacteriological examinations by Oliet3 showed that a 10-second exposure to molten metal or very fine glass beads at 213°-218°C. (415o-424°F.) destroyed all forms of organisms commonly found in root canals.Grossman6 listed three objections to molten-metal sterilizers: dross formation; adherence of metal particles to instruments, paper points, and cotton pellets; and danger of burns caused by upsetting the molten-metal bath. In an attempt to overcome these objections, he tested a bath containing ordinary table salt as the heat-transfer medium.2More recently, Oliet, Sorin, and Brown,7 using molten metal, glass beads, and salt, determined temperature gradients within these well-type sterilizers and found considerable differences in temperatures at different points in the well when salt or glass beads were the heat-transfer media.The present study was designed to clarify the following with respect to well-type sterilizers: the relation of instrument temperature to time, during and after immersion in different media; the relation of instrument size and shape to the temperatures attained by the instruments; the relation of sterilizer media to the temperatures attained by the instruments; and the effect of immersed instruments on the temperature of the media.A portion of this paper was presented at the annual meeting of the International

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