. The Dental cosmos. A B A, End of screw notched to take Screw bent to bring crown in line withneighboring natural teeth. Fig. 6, a.) Care is to be taken that thepost nearly fills the perforation in theporcelain tooth. This is 2 mm. approxi-mately in diameter, and the most usefulsizes of posts will range from to 2mm. If the post is small, the terminalnotch can be prized open, so as to prac-tically rivet the tooth. The post isscrewed into the canal, and the selectedtooth tried. Invariably the anterior teethhave too much forward slant, and it isnecessary to bend the post wher
. The Dental cosmos. A B A, End of screw notched to take Screw bent to bring crown in line withneighboring natural teeth. Fig. 6, a.) Care is to be taken that thepost nearly fills the perforation in theporcelain tooth. This is 2 mm. approxi-mately in diameter, and the most usefulsizes of posts will range from to 2mm. If the post is small, the terminalnotch can be prized open, so as to prac-tically rivet the tooth. The post isscrewed into the canal, and the selectedtooth tried. Invariably the anterior teethhave too much forward slant, and it isnecessary to bend the post where itemerges from the root, till the correctslant is obtained and the chosen tooth isin line with the natural teeth on eitherside of it. (See Fig. 6. b.) Finally thepost is permanently screwed to place andfixed with cement to which some anti-septic such as powdered thymol has beenadded. If a removable post is required,gutta-percha is used for fixing. Gutta-percha reinforced by the screw can be Fig. Ready for investing. culty is avoided by selecting a tooth ofsuitable size, but if this is unobtainable,it is at the posterior margins that thedisparity shows. The posterior marginof the diaphragm must be thickened bybeveling either the root or the porcelaintooth behind, and allowing the finisheddiaphragm to overlap the bevel. Owing to the bend in the post, theanterior margin of the porcelain toothis thrown forward, so that, even whenit is of smaller size, it seldom falls shortof the root on this aspect. To make the wax form for the dia-phragm a special wax is prepared bymelting one part rosin with three partsordinary inlay wax. The rosin is addedto make the wax adhesive. A pellet issoftened and put on top of the previouslywarmed tooth, the whole being pushedto position over the end of the post, andtrimmed to fit the root. It is sometimesimpossible to complete the trimming in ELPHIXST0XE. TUBELESS TEETH IX PROSTHETIC WORK. 429 position on the root on account of thecloseness of the
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Keywords: ., bookcentury1900, bookdecade1910, bookiddent, booksubjectdentistry
