Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . is put intoa suitable perfectly dry wide-mouth bottle and covered with Jounce of a colorless pure paraffin oil (nujol, etc.). The bottlecontaining the mixture is placed on a heated sand bath until com-plete solution is obtained. On cooling, the mixture has the con-sistence of butter in cold weather. With a broach a very smallquantity of this paste is transferred to the varnished canal andspread over its wall. A blast of warm air will greatly assist inits even distribution. The object
Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . is put intoa suitable perfectly dry wide-mouth bottle and covered with Jounce of a colorless pure paraffin oil (nujol, etc.). The bottlecontaining the mixture is placed on a heated sand bath until com-plete solution is obtained. On cooling, the mixture has the con-sistence of butter in cold weather. With a broach a very smallquantity of this paste is transferred to the varnished canal andspread over its wall. A blast of warm air will greatly assist inits even distribution. The object of using this paste is primarilyto place a lubricant into the canal to facilitate the ready adapta-tion of the gutta percha under pressure, and secondarily to occludeevery nook and corner by an unshrinkable material. We againemphasize that only the smallest possible quantity of this paste must be employed. Final Plugging of the Root Canal. —Before starting the final opera-tion of plugging the root canal the roentgenogram with the diag-nostic wire in position is carefully examined so as to obtain a fair. Fig. 139.—Glass contained for gutta-percha cones. Gutta-percha cones cut in shortlengths ready for use. (Coolidge.) conception of the size, general outline and length of the canal. Toapproximately determine the size of the foramen, a suitable sterileroot-canal plugger is selected and inserted. Too small a pluggerwill pass through the foramen which is indicated by pain. Thecorrect instrument should pass up to, but not quite to the very small piece of rubber dam stretched over a smooth broachmay be used as a guide to determine the length of the canal. Asuitable sterile gutta-percha cone which approximately fits thelumen of the canal is selected from the cone sterilizer and is cut 230 DISEASES OF THE DENT \L IT Li into pieces about j inch (.3 nun.: in length. A suitable piece whichapproximately will lit the upper end of the canal as determined by ml olguttapercha must
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