Browsing by Subject "Denture, Complete"

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    A Cephalometric Appraisal of Dentofacial Changes Following the Insertion of Artificial Dentures
    (1955) Starr, Richard; Muhler, Joseph; Phillips, Ralph
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    Changes in Lip Position Coincident with the Movement of Artificial Teeth
    (1960-06) Robinson, Robbie G.
    A method was devised and described to study changes in lip position coincident with the movement of artificial teeth. Investigation was initiated in an attempt to find out if when factors such as growth and occlusion are eliminated and if when factors such as centric relationship and vertical height of the maxilla and mandible remain constant, how much change a given amount of movement of the maxillary central incisors will produce in the lips. Not only was the anterior-posterior position of the lips measured but also the amount of the interlabial gap was noted. Acrylic bite blocks were constructed. The maxillary one had wire pins imbedded in the molar region which would fit into holes in the same region of the mandibular one. This made it possible to maintain a given vertical and anterior-posterior relationship of the maxilla to the mandible. The anterior positions of the rims were constructed so that artificial anterior teeth rigidly set in acrylic could be fixed to the bite blocks or removed at will. There were three sets of artificial teeth for each patient. They were positioned forward from a point on the AP plans at increments of approximately 3 mm. The labial surface of these teeth had lead foil glued on them so that they could be easily seen in a lateral headplate. Four lateral headplates were taken of each subject. In all of the lateral headplates the subjects lips were at rest. There was one headplate with only the bite blocks in place and then one for each tooth position. Tracings were made of each of these headplates, and they were superposed one on the other by means of guide lines. Measurements of the position of the teeth and of the lips were taken from this composite by means of a vernier. A measurement of the amount of interlabial gap was taken directly from each lateral headplate. The means of the data showed that as the maxillary incisors were forward the upper and lower lips move forward and the amount of interlabial gap becomes larger. The means also showed that the amount of forward movement of the maxillary lip after each increment of tooth movement was larger than the previous one. This was also the pattern of the interlabial gap. The mandibular lip pattern was just the opposite, each movement forward after a given increment of tooth movement was smaller than the previous one. There was considerable individual variation and the results demonstrated by the means were not true for all of the individuals. Much of the variation could be related to the adequacy or inadequacy of the lip tissue covering the teeth. Generally it was noted that the more inadequate the tissues covering the teeth the more dramatic the tissue change.