A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . 320 PART VI. DENTO-FACIAL MALOCCLUSIONS treatment. The dental models shown below the facial casts were made fromimpressions taken in the usual manner by pressing modeling-compound againstthe front teeth, with the mandible in its most posterior position. When one con-siders the mechanism of the cause, it will be seen that this straightening of the man-dible, while not inhibiting its growth in other dimensions, increases the distancefrom the point of the chin to the condyle, with
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . 320 PART VI. DENTO-FACIAL MALOCCLUSIONS treatment. The dental models shown below the facial casts were made fromimpressions taken in the usual manner by pressing modeling-compound againstthe front teeth, with the mandible in its most posterior position. When one con-siders the mechanism of the cause, it will be seen that this straightening of the man-dible, while not inhibiting its growth in other dimensions, increases the distancefrom the point of the chin to the condyle, with a protruding movement of the bodyof the mandible and its contained lower denture. Again, when one remembersthat the prime cause of obstructed nasal breathing and its resultant open-bitemalocclusion is adenoids, which in themselves are the prime cause of inhibited de- FlG. velopment of the maxilla, and which result in the common upper retrusions, one canthen appreciate why it is that open-bite malocclusions are so frequently fovmd inClass III, and also why, in so many of these cases, the mandible appears to be sodecidedly prognathic in relation to the upper, but which no doubt is partly due to avisual effect in comparing the immediate relations of even a moderately protrudedlower with a decidedly retruded upper—the one enhancing in appearance the dis-harmony of the other. In three of these cases, as in many others of the same pronounced character,the mandible is bent appreciably to one side, as shown by comparing the relationsof the upper and lower front teeth. This condition may be due to an unevennessin the action of the forces, or perhaps what is more probable, as mentioned in thechapter on Lateral Malocclusion, it arises when the mother, either from thought-lessness or possible necessity, causes the babe to lie upon one side far more than CHAPTER
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