The significance of the natural form and arrangement of the dental arches of man : with a consideration of the changes which occur as a result of their artificial derangement by filing or by the extraction of teeth / by Isaac B. Davenport.

  • Davenport, Isaac Burnet.
Date:
[1887]
Catalogue details

Licence: Public Domain Mark

Credit: The significance of the natural form and arrangement of the dental arches of man : with a consideration of the changes which occur as a result of their artificial derangement by filing or by the extraction of teeth / by Isaac B. Davenport. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Fig. 5 is the same as Fig. 4, excepting that the first planes of ar- ticulation are out of relation, owing to an over-projection of the front teeth, so that contact of the molars is lost on all the first planes of Fig. 5. articulation. With such a condition mastication is effected princi- pally by a chopping motion, with but a limited lateral and rotary movement. Fig. 6. Fig. 6 shows a fortunate result after extraction, for the general planes of articulation are not disturbed; only certain grinding sur- faces have dropped out of position, and become useless in consequence of the downward tipping of the molars in their search of support for the arch. Fig. 7. Fig. 7 shows the curved lines so much out of relation that there are no general planes of articulation. The striking of the points of the cusps of the second and third molars prevents what otherwise would be a perfect articulation of the bicuspids and first molars, and vice versa. We sometimes find patients with this condition doing most of their eating with the front teeth, for otherwise mastication