Transactions of the Fourth International Dental Congress Volume 1

Transactions of the Fourth International Dental Congress Volume 1

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ... about which that rotation takes place, and it appears to me that it is necessary, in addition to securing a record of the directions and form of the condylar path, that we secure a record of the axes about which this rotation of the jaws in the horizontal plane takes place. When that has been accomplished, I think another step will have been taken in the matter of solving the problem of reproducing by an instrument all the movements of the mandible. At this point Dr. C. K. Turner took the chair. Dr. Ceyer. Mr. Chairman, I wish to say a few words. The subject of the movements of the mandible is a very interesting one, not only from the standpoint of the prosthetic dentist, but from the standpoints of the anatomist, the physiologist, and even the pathologist. Even our best anatomists speak of the mandible swinging from the point of the condyloid process. It certainly does swing against this pivotal or focal point when the mouth is slightly opened--say perhaps in opening it not more than half an inch between the incisal edges. Such action does not change the pivotal point; but at the very moment the jaws are opened wide enough to take in food the arrangement is changed, and the mandible acquires the character of a floating bone, just as is the case with the hyoid bone. We cannot give any specific description of the movements of the hyoid bone for this reason, viz, that it has no bony articulation. It is controlled by muscles from above, below, anteriorly, and posteriorly, and even muscles coming from various directions control its movements. It will rock or move according to the tension of any one of those muscles, or to the combination of their individual forces. We could not say what the pivotal point is of the hyoid bone. I am inclined to class...show more

Product details

  • Paperback | 204 pages
  • 189 x 246 x 11mm | 372g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236621999
  • 9781236621993