. The Dental cosmos. aluminum plate to the model upon theproper plane. For the upper teeth it was naturallyfound advisable to make a plaster modelof the case, and adjust the aluminum toit, but in all lower cases they could bereadily fitted to the teeth. With such aguide it was only necessary to hold the61ms in position against the aluminum K ELLS.—STEREOSCOPIC DEN T A L SKIAGKAPItS. 749 plane, and results sufficiently accuratewere obtained. But, for reasons that must be obvious,no stereographs taken in that mannercould be mathematically mounted for use,and to place them in their proper relativ
. The Dental cosmos. aluminum plate to the model upon theproper plane. For the upper teeth it was naturallyfound advisable to make a plaster modelof the case, and adjust the aluminum toit, but in all lower cases they could bereadily fitted to the teeth. With such aguide it was only necessary to hold the61ms in position against the aluminum K ELLS.—STEREOSCOPIC DEN T A L SKIAGKAPItS. 749 plane, and results sufficiently accuratewere obtained. But, for reasons that must be obvious,no stereographs taken in that mannercould be mathematically mounted for use,and to place them in their proper relative Fig. positions for observation was by no meanseasy. To partly overcome this difficulty,opaque guides, preferably two in number,are affixed either to the teeth or tothe plane. These show upon the films, ofcourse, and in mounting them it is onlynecessary to see that they register witheach other, whereby this step is made a cork is placed between them, withoutwhich the lower jaw could not be heldimmovable. The next step in this direction was tomake a holder as shown in Fig. 3. Thebase is of brass, the top of compound is molded along itsedges to fit the teeth, which insures itsbeing held immovably and in is for the upper teeth only. Thereis just enough space between the upperand lower plates of this holder for theinsertion of a film when inclosed in itslight-proof cover, and the second onemust necessarily be on the exact plane Fig. 0.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
