The Dental cosmos . thread of one-eighth of an inchbelow the surface, we can run those screws in and then restore the restwith copper amalgam, then put on this crown, and we get one that isvery strong and that will hold. (Fig. 5.) I cannot attach a crown tosuch a root as that by any other method. I have several in use whereI have gone down below the edge of the gum for attachment, andthey are doing good service. This crown may also be set under water, with the exception ofsetting the oxyphosphate. The copper amalgam will go into thegrooves, or into a root, under water, and set just as good as
The Dental cosmos . thread of one-eighth of an inchbelow the surface, we can run those screws in and then restore the restwith copper amalgam, then put on this crown, and we get one that isvery strong and that will hold. (Fig. 5.) I cannot attach a crown tosuch a root as that by any other method. I have several in use whereI have gone down below the edge of the gum for attachment, andthey are doing good service. This crown may also be set under water, with the exception ofsetting the oxyphosphate. The copper amalgam will go into thegrooves, or into a root, under water, and set just as good as if put indry. Gutta-percha may be used instead of oxyphosphate, with goodresults. I also recommend the Howland all-porcelain crown to beset by this method ; the bicuspids and molars should be ground outwith diamond drill. I have tried to present to you this crown as simply as possible. Ifthere is any point which I have not made clear, I will be very glad toanswer any questions which may be put to me. Fig. 4. Fig. FIRST DISTRICT DENTAL SOCIETY, STATE OF NEW YORK. 133 The President. Gentlemen, this very interesting discourse upontooth-crowns is before you for discussion. Dr. A. R. Starr. Mr. President, I want to ask how the doctor fastensthe post in the root; whether with oxyphosphate, or by screwing itinto the root. Dr. Stowell. By tapping out the root and using a screw-post, as Ihave already stated. We have three drills and three taps, and threesizes of screws. I have used the first size for all single-root teeth ; forbicuspids and molars I frequently use the second and third sizes. Ihave in some cases set the screw with oxyphosphate, where the holein the root had been reamed out too large for the screw-thread tohold. Dr. Starr. I have used a similar method in setting what is calledthe Howland crown. It is a hollow countersunk crown, and can beadjusted over either a single or a double pin, and can also be used formolars. I presume the reason I have had trouble with it is be
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