| Popis: |
The prognathous type of man represents a symmetrical protrusion of both maxillary bones. Prognathism is an asymmetrical protrusion of one or the other maxillary bone, or one side of one of them, producing a malocclusion of the teeth and a variable degree of deformity of facial profile. The Neanderthal man, changing by evolution according to Wells into the Cro-Magnon, was the prognathous type, and his classification of the paleolithic, the first true man (Homo sapiens) represents the orthognathous. so-called Grecian profile. Prognathism is not racial nor hereditary but a pathologic entity. It may be embryologic, an error in development, or a disparity in the symmetry of growth due to existing factors not well understood. Anatomically viewed, when occurring in connection with the mandible, it represents an obtuse angle of the mandible rather than an increased length of the body. Usually concomitant overdevelopment of the mental process exists. Thus a deformity |
