Verhandlungen des XInternationalen medicinischen congresses, Berlin, 1890 . greater arc of upward movementof the lower incisors than a Hat roof. When the second molars erupt, they are prevented from doing sofullv bv the closeness of the bite. •I V The following points are to be observed in diagnosis: 1. The facial angle is less than normal. 2. The alveolar process of the upper and lower maxilla are ex-cessively developed. 3. The upper incisors protrude below the upper lip in cases oflong standing and are spread more or less. 4. The lower maxilla mav be normal, or the chin mav recede
Verhandlungen des XInternationalen medicinischen congresses, Berlin, 1890 . greater arc of upward movementof the lower incisors than a Hat roof. When the second molars erupt, they are prevented from doing sofullv bv the closeness of the bite. •I V The following points are to be observed in diagnosis: 1. The facial angle is less than normal. 2. The alveolar process of the upper and lower maxilla are ex-cessively developed. 3. The upper incisors protrude below the upper lip in cases oflong standing and are spread more or less. 4. The lower maxilla mav be normal, or the chin mav recede. 5. Bite of molars too short. 112 Abtheilunff XIV: Zahnheilkunde. III. Anterior protrusion found in the V-shaped arch. When, from a want of harmony between the size of the teeth andthat of the upper maxilla, their combined diameters form an arch largerthan that of the maxilla, the teeth are necessarily crowded, andwhen the cuspid erupts, it pushes the anterior column forward. Thisleads to a flexion in the alveolar process at its weakest point whichis at or near the mesial Fig. 3. The local causes producing the same condition on the forwardmovement of the first molars of the upper jaw due to the prematureextraction of the deciduous teeth or the arrested growth of the ramusof the lower maxilla. In these cases the following points should be noted:1. The facial angle is normal or nearly The alveolar process is normal with the exception of anteriorflexion only indicated by the crowded central incisors. 3. Lower maxilla normal or shortened at the rami. 4. Upper incisors crowded coming to an angle at the mesial line. 5. Bite usually more or less defective. 6. Gums usually healthy. IV. Anterior protrusion due to thumbsucking. The habit of thumbsucking manifests itself early, sometimes evenduring the first or second week. The location of this deformity isnot uniform, as it depends upon the hand used and the habitual po-sition of the finger or thumb: The development of th
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