The Science and Practice of Dental Surgery

The Science and Practice of Dental Surgery

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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. 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 more

Product details

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