Improvements in dental cements / [Albert Paul Tschirner].

  • Tschirner, Albert Paul.
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in dental cements / [Albert Paul Tschirner]. Source: Wellcome Collection.

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    N° 22,230 A.D.1399 5 10 15 Date of Application, 7th Hov,, 1899-AcGQpted, 9th Dec,, 1899 CO^IPLKTE SrFX'IFICATIOX. Improvements in Dental Cements. I, Albert Paul TsrniRXER, a Citizen of tlio TAiited States, residing' at No. dOT, Xortli Spring’ Avenue, in the ('ity of St. Louis, State of Missouri, Fnited States of America, Dentist, do lierehy declare the nature of this inven¬ tion and in what manner tlie same is to ‘he performed, to he i)articulai‘ly described and ascertained in and by the following statement; — It is well known that zinc phosphate dental cements contain more or less glycerine, which is added for the purpose of obtaining a plastic, workable mass, and to lessen the quick action of the phosphoric acid on the oxide ot zinc. As these glycei-ine comjiounds are very unstable, being unable to '''’ilh- stand the action of the saliva, it has been desirable to obtain a tilling material avoiding the use of glycerine or any soluble, foreign substance which would deteriorate or waste awav in the mouth. . i i i i i i It is the object of my ])iesent invention to ])roduce an insoluble, pliospluile of zinc cement, in which no glycerine or any other solutile substance is used Mv invention consists in a liiinid compound, the base of which is an acu idiosphate of zinc, combined with a powder consisting mainly of oxide ot zinc, with other basic oxides added in various iiroportions, tor the purpose ot adapting mv cement to the various operations required ^ ‘hmtistn. fu canving out, mv iuventiou, 1 have fouu.l tho follo.v.no- anwer aainiiablv. but it is obvious that the i)ro|)ovtions fiivon can bo chanj.o , anil tho init,oaiout,s also obaug^ul, without, in tho least, .lopavtmg from ,1 o imturo and' ririiiciplo of mv iiivontion: In a fluid ouimo of phosidionc amd, ap lv-IxSelv a spocitlc gravity of l.bt), I dissolvo lb() f of zinc and then add two drams of aqua ammonia, after which the P'PJ ‘ 25 m-airatoii to a density of about 1.94.5.' The pouter,to be used with the above liquid is composed of four parts of oxide of /i , • * 1 of tin and two parts oxide of aluminium. ,. . , ,i To \me the cement, a desired .pmutity of powder is made plastic bj the liquid compound, as is well understood. f.ii„,rs • In a fluid ounce ot Another illustration of or;i.aii s of oxide of zinc, liud fortv grains of oxide of alnniinium. Ihe Pqvd^' . T ti,eclair me,I’tiid fonnula, the aluminium is introduced intoMle liquid compound instead of the is'loiid'of tion In both illustrations it will be noticed that <y ^ i,soluble basic phosphates, free of a,,y substance soluble in uatei, such glvcprino, gelatin, or other similai su ^stances. Ufx+L contain liquid and powder'conMM Tlfe liquid constituents of the z^m,. that the phos. [Price 8^Z.] 20 30 35 40