. The science and practice of dental surgery. Fig. 723.—Logan pin, and sectional view of Loganpin in root.(iS. >S. White Denial Manulacturing Co.) the attempt is made to secure a perfect fit—diffi-culties that can only be surmounted by undulysacrificing valuable tooth substance. They -can be fitted to the root direct in themouth or to a model in the workroom. Ineither case the sharp edges of the platinum pinshould first Ije removed with a file to lessen thenecessity for making such a very large hole inthe Fig. 724.—Lugan Crown. Shows the unsnitabihty ofa Logan Crown for a Ijifid root
. The science and practice of dental surgery. Fig. 723.—Logan pin, and sectional view of Loganpin in root.(iS. >S. White Denial Manulacturing Co.) the attempt is made to secure a perfect fit—diffi-culties that can only be surmounted by undulysacrificing valuable tooth substance. They -can be fitted to the root direct in themouth or to a model in the workroom. Ineither case the sharp edges of the platinum pinshould first Ije removed with a file to lessen thenecessity for making such a very large hole inthe Fig. 724.—Lugan Crown. Shows the unsnitabihty ofa Logan Crown for a Ijifid root. The pin of theLogan has been spht and the two halves havebeen bent away from each otlier. To accommodatethis an excessive amount of root-substance wouldhave to be removed, and the root lamentablyweakened. (<S. <S. White Dental Maniifacturuig Co.) To Fit a Logan Crmvn Direct to the —Enlarge the root-canal in the rou-tine way (see p. 549); then further enlarge itwith an Ottolenguis reamer, and make it oval insection by bearing on the reamer alternatelyanteriorly and posteriorly, until it is largeenough to admit the post. Shape the face of the root by grinding it toa simple form with a wheel, concaving it a littleunder the free edge of the gum at the labio- cervical edge, leaving it, if possible, a littlestanding free of the gum elsewhere, and arrivingas far as possible at a flatfish, or even ratherdomed, suiface. Now grmd the base of thecrown to fit the root-face with a carborundum
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
