The Dental cosmos . or the Flexo Sepa-rating Files and Saws are, that they are thinner,and while they are tempered so hard that theywill cut as rapidly as the ordinary files, they canbe bent without breaking and will stay bent sothat they can be readily adapted to the shape ofthe tooth they are used upon, thus presentinga larger cutting-surface at one time ; that theylast longer than ordinary files, as there is practi-cally no breakage, and they are therefore usefuluntil worn out. Being made of steel, the Flexo Files cannot bebent like a piece of iron wire, but by manipu-lating them between th
The Dental cosmos . or the Flexo Sepa-rating Files and Saws are, that they are thinner,and while they are tempered so hard that theywill cut as rapidly as the ordinary files, they canbe bent without breaking and will stay bent sothat they can be readily adapted to the shape ofthe tooth they are used upon, thus presentinga larger cutting-surface at one time ; that theylast longer than ordinary files, as there is practi-cally no breakage, and they are therefore usefuluntil worn out. Being made of steel, the Flexo Files cannot bebent like a piece of iron wire, but by manipu-lating them between the thumbs and forefingersa little at a time they can be readily and quicklycurved to the desired form. Used wet, they willclear themselves. The regular numbers of the Files, 000, 00, o,1, 2, 3, are made with one safe side, cutting onone side and both edges. The Saws are onlymade No. 000, having both sides safe and cuttingon edges only. The No. 000 have 125 cuts tothe inch. Price, either Files or Saws . per doz. $ 37 TEST-PAPERS FOR DENTISTS. Very frequently it is important to the dentist to know whether his peroxideof hydrogen, which is so liable to change, is still good or has become de-composed ; or whether his solution of bichloride of mercury has become inertby the reducing action of organic matter in the water under the influence ofsunlight. And so of many other chemicals used in the dental office whichare apt to change in strength. Prof. Chas. Mayr, of Springfield, Mass., has prepared a series of test-papers,which will enable the dentist to learn quickly and accurately whether his prep-arations are good or worthless, and without the use of cumbersome are put up in neat little books, each containing eight different papers(of some, like litmus, several papers are provided), affording sixty-four differ-ent reactions. The papers are as follows : Phenyl- Carbinol, for strong acids and alkalies. Turmeric, for alkalies. Sulphide, for~solutions of metals. Potassi
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectdentist, bookyear1890
