The Dental cosmos . one that is slightly curved. Toovercome this difficulty the cone bur isused. It comes in various sizes, and istherefore easy of manipulation in allplaces. The approximal spaces as well asbadly decayed roots that extend for someconsiderable distance beyond the gummargin can be reached with it and bev-eled, as easily as can the labial and pala-tal surfaces. The bleeding from the gumsthat usually accompanies all operationsof this nature is easily checked by astream of cold water from a syringe,which also cleans the part from the debriscaused by the bur. An impression tube, fun
The Dental cosmos . one that is slightly curved. Toovercome this difficulty the cone bur isused. It comes in various sizes, and istherefore easy of manipulation in allplaces. The approximal spaces as well asbadly decayed roots that extend for someconsiderable distance beyond the gummargin can be reached with it and bev-eled, as easily as can the labial and pala-tal surfaces. The bleeding from the gumsthat usually accompanies all operationsof this nature is easily checked by astream of cold water from a syringe,which also cleans the part from the debriscaused by the bur. An impression tube, funnel-shaped, ismade from a thin piece of German silvercut in the shape of a keystone, the edgesof which are bent together and solderedwith silver solder. By means of pliersand shears, it is made to fit loosely aroundthe bevel and under the gums. It is then filled with wax to within one-quarter inchof its wide surface. (Fig. 2.) Anycheap quick-setting cement is then mixedto a medium consistence, placed in the Fig. tube, and pressed against the face andbevel of the root. The tube is held be-tween the thumb and the first and middlefingers, the other fingers resting againstthe adjoining teeth or the roof of themouth so as to keep the tube in balance. An impression of the root and bevelthus taken, a facsimile of the root in ce-ment is the next desired step. As a sep-arating medium, the soaking of the im-pression for about ten minutes in for-malin or the coating of its surface withglycerin can be employed. The glycerinworks better in my hands, and is there-fore always used. As the outer edge ofthe bevel is usually on a line with theedge of the impression tube, in order thata cast of a suitable size may be ob-tained, it is necessary to form a matrixaround the impression. This is accom-plished by holding the tube in the cornerof a piece of paper about the size of aprescription blank, and rolling until itis well wrapped. A wax thread is woundaround the paper tube to hold it in place.
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