Dental Headlight Volume 25

Dental Headlight Volume 25

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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 Excerpt: ...the matrix can be perfectly made and withdrawn without changing its shape in ever so slight a degree. To this end we need not hesitate to sacrifice frail walls, especially upon the occlusal surfaces, as the crowns of molars and bicuspids and the palatine walls of superior incisors. In all approximal cavities sufficient space must be gained by wedging or filing., i The preparation of a cavity for porcelain, while similar to that for gold, has one point of difference which, if not observed, will much lessen the durability of the filling, and that is the edge. At all occlusal surfaces the walls of the cavity must be at right angles, and thin edges must be avoided as much as possible. All the walls of the cavity should be as near right angles as circumstances permit. Avoid saucer-shaped cavities by squaring the bottom and thereby assisting retention. Occasionally some decayed dentine should be allowed to remain untillthe complete filling is ready to be set, if its premature removal would necessitate undercuts. But usually every particle of decay can be removed with advantage in the first preparation of the cavity. All edges should be clearly defined and well polished, so that you-may burnish the edges of the matrix perfectly. It is also well to polish the interior of the cavity, as this will make the removal of the matrix much easier. The instruments used to accomplish this perfect preparation must depend upon the operator and the case. It is not sufficient to simply have the cavity well-shaped and polished. Every visible portion of the tooth under treatment must be examined, every bit of tartar must be removed, every pit and blemish in the enamel must be made as smooth and clean as practicable, and often the very shape of the tooth must be...
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Product details

  • Paperback
  • 189 x 246 x 4mm | 159g
  • United States
  • English
  • black & white illustrations
  • 1236780922
  • 9781236780928