Atlas and text-book of dentistry including diseases of the mouth by Preiswerk Gustav

Author:Preiswerk, Gustav
Language: eng
Format: epub, pdf
Publisher: Philadelphia : W.B. Saunders Company
Published: 1906-03-25T05:00:00+00:00

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Piitholog'ic proonatliisin shows many variations ; it may consist simply in a moderate extension forward of the upper teetli which are separated from the lower teeth by only a few millimeters ; or the separation may eqnal a centimeter, in which case, of course, the superior maxilla has developed to an unusual size. In many cases l)rog-nathism of the U})per jaw is simulated by failure of the lower jaw to develop to its nornuil si/e, while the superior maxilla is fully developed. If, on the other hand, the lower jaw protrudes, we have the condition known as prorinathism of ihe inferior maxilla (Plate 17). According to Virchow, the lower jaw of the inhabitants of Fries-land protrudes normally so far beyond theujiper jaw, that the lingual surface of the lower incisors points to the labial surface of the upper incisor teeth. The pathologic form of prognathism of the lower jaw is not always due to excessive growth of the inferior maxilla (analagous to prognathism of the uj)j)er jaw), for on the contrary it may be normal in development, the superior maxilla having failed to reach its normal size.

Mordcx apcrfiis earahclli (Plate 18), or " malocclusion," is a rare condition in which the two rows of teeth do not meet in the neighborhood of the incisors. It occurs chiefly in children who sutler from hypertrophied tonsils or from adenoid growths of the nasopharynx, on account of which the mouth is continually kept ()j)en. As a result the alveolar portion of the; jaws in the region of tile molars grows abnormally large.

The coHtracfcdjain (Fig. 8-1, lower iliiisiratioiO, which undergoes a saddle-like contraction in the neighborhood of the bicuspid teeth, may also occasionally cause jirogna-thism and mordex apertus. This condition is always associated with a high ))alate, and is really an anomaly of the jaw in which the teelh do not assume their altered positions until the se('on<l dentition. Down found the contracted jaw with a high palate chieHy in idiots.

The so-called t'-.s7my>rr^jVn/'(Fig. 85) must not be mistaken for a contracted jaw. The former docs n<»t possess a dental arch, but instead the teeth form a straight lino

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