The Science and Practice of Dental Surgery

The Science and Practice of Dental Surgery

By (author) 

List price: US$64.86

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks

Description

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. 1914 edition. Excerpt: ...oils. It is insoluble in water, dilute acids and alkalies, and in alcohol. When incinerated pure guttapercha leaves about one per cent of ash only. The chief uses of gutta-percha in dental practice are: as a filling-material; to form rooti canal fillings; for taking impressions; as a I soft lining for lower dentures; for setting crowns and bridges. For these various purposes other substances are added with the object of imparting special properties. Gutta-percha as a Filling-material.--The chief advantages of gutta-percha as a filling-material are: when softened it is easily inserted; it is a very poor conductor of thermal changes; it is compatible with the tooth substance; it is insoluble in the oral fluids; and it protects the I tooth against recurrent caries. The chief disI advantage is that it is the least hard and rigid of any filling-material; its use is therefore contra-indicated in situations where it is liable to be subjected to much mechanical stress during mastication; some makes tend to swell and are to a certain extent porous, becoming foul after being in use for some time. To impart hardness and thus improve its wearing properties, zinc oxide and finely ground silica are added; this is accomplished by in. corporating a little at a time and thoroughly kneading it into the softened gutta. The forms of gutta-percha known as low, medium, and high heat, are produced by varying the amount of zinc oxide; thus, the low heat contains 4 parts of zinc oxide to 1 of gutta-percha and is softened at a temperature below 200 F.; the medium contains 6 to 1 and softens at 205 F.; whilst the high heat contains just sufficient gutta-percha to bind the particles of zinc oxide together and softens at about 220 F. (8). Whilst the addition of such...show more

Product details

  • Paperback | 518 pages
  • 189 x 246 x 26mm | 916g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236846176
  • 9781236846174