Quarterly Circular Volume 21

Quarterly Circular Volume 21

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 edition. Excerpt: ...has proved to us that this crosswise undercutting affords an excellent hold. The bold is still further increased if we cut the gutters by holding the diamond disc, not at right angles, but at an acute angle to the ground porcelain inlay, and if we provide one half of the inlay with gutters running to the left, and the other half with gutters running to the right. The gutters should be cut as deeply as the ground inlay allows, and they should also reach over the edge, whereby the hold will be still greater. For the undercutting of ground inlays I only employ diamond discs, not FrG. 43. the very small ones, only the medium and large; but thin metal discs fed with wet carborundum powder are by many recommended for this purpose (Fig. 44). In undercutting the inlay, porcelain dust mixed with water coloured by the copper of the diamond disc becomes fixed in the fine gutters and Shows how the diamond disc is held when making the grooves or gutters on the inner end of the inlay. there forms lines of dark appearance. These must, of course, be removed before we think of cementing-in the inlay, not only because they make the transparent porcelain appear darker in colour, but also because the cement cannot enter the gutters so thoroughly if they are left partially clogged up. We must not employ excavators, tempting as they are, for clearing out the gutters, because in passing an excavator through the fine gutters splintering of the porcelain may take place.. It is best to lay the ground porcelain inlay in alcohol for a few minutes, at the end of which time the softened particles of dust can be easily removed by means of a rotating brush in the handpiece of the dental engine. I employ alcohol because it evaporates easily; if water is used moisture...show more

Product details

  • Paperback | 70 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236892631
  • 9781236892638