The Dental cosmos . If the canal is unusually large, as in Fig. 8, a narrow strip of platemay be bent around the post and pinched close upon it. A suitableclamp will hold the plate ends together while they and the plate arebeing soldered on the post. The piece is then filled to the shapeshown in Fig. 9. Before drilling the root, it is well to drill a trial-pieceof bone, and with a large round bur, followed by an inverted conebur, form the enlargement of the socket, and with a fissure-bur cutthe groove for the feather. Of course, the better way is to make a Fig. 15. Fig. 16. Fig. 17. Fig. i<
The Dental cosmos . If the canal is unusually large, as in Fig. 8, a narrow strip of platemay be bent around the post and pinched close upon it. A suitableclamp will hold the plate ends together while they and the plate arebeing soldered on the post. The piece is then filled to the shapeshown in Fig. 9. Before drilling the root, it is well to drill a trial-pieceof bone, and with a large round bur, followed by an inverted conebur, form the enlargement of the socket, and with a fissure-bur cutthe groove for the feather. Of course, the better way is to make a Fig. 15. Fig. 16. Fig. 17. Fig. i<s. Fig. 19. Fig. countersink-drill that will at once and truly cut both the socket and itsenlargement at the same time. Fig. 10 shows in section the finishedcrown. In some instances a wedge-shaped seat may be burred and cutsquare by a file, as in Fig. 11. The feather is then to be made of apiece of plate and soldered to the wire (Fig. 12), the operation pre-paratory to removal for investment being shown by Fig. 13. Thecompleted and mounted crown is illustrated in Fig. 14. It may sometimes occur that a tapering post is desirable. Such aone is shown straight in Fig. 15, and bent inwardly, as in Fig. 16, to 368 THE DENTAL COSMOS. suit some requirements of adjustment. The How four-pin crown, , may be readily adjusted on the feathered post by bending the longpins around it, as in Fig. 18, and be then removed, invested, contouredwith porcelain body and enamel, and baked in the Parker-Stoddardfurnace with the excellent result shown in Fig. 19, the mounted crownresembling that seen in Fig. 20. It would
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectdentist, bookyear1890
