Mechanical side of anatomical articulation / by George Wood Clapp.

  • Clapp, George Wood, 1870-
Date:
1910
Catalogue details

Licence: Public Domain Mark

Credit: Mechanical side of anatomical articulation / by George Wood Clapp. Source: Wellcome Collection.

    17/104 page 9
    tinuous groove, narrow in some places and wide in others. Into this groove the buccal cusps of the lower bicuspids and molars fit. When the teeth have been slightly worn by the processes of mastication, the fit of the cusps into the sulci and fosse of the opposing teeth is nearly perfect. The occlusal surfaces of the lower bicuspids and molars beginning Int. No. 8.—Natural dentures in position illustrated diagrammatically in Illustration No. 7. Seen somewhat from below. From the right lateral backward, both dentures are in close contact, the buccal cusps of the posteriors being interdigitated. The lower left third molar is in contact with the upper left second molar, establishing balance. The teeth are considerably worn by use. with the second bicuspid, show a similar groove, and into this groove the lingual cusps of the upper bicuspids and molars fit. POSITIONS OF THE TEETH IN THE LATERAL EXCURSION OF THE MANDIBLE When the jaw starts on that movement which is to end in the trit- urating of food, it moves downward and to the right (or perhaps to the left). It thus separates the occlusal surfaces of the teeth and into the space thus provided the cheek and tongue thrust the food to be triturated. The mandible, still held to the side, moves upward and comes in contact with the upper jaw in such position that the buccal cusps of the lower bicuspids and molars, on the side engaged in crush-
    digitised image 1
    digitised image 2
    digitised image 3