Verhandlungen des XInternationalen medicinischen congresses, Berlin, 1890 . -dition noticed by all who have introduced artificial dentures in suchmouths. That this anterior protrusion is noticed only in persons at orpast middle age strengthens this theory. Points of diagnosis: 1. Facial angle normal. 2. Alveolar process normal. 3. Lower maxilla normal. 4. Upper incisors more or less protruding and diverging. 5. Bite shorter than normal. 6. Posterior teeth loose. Tartar may or may not be Anterior protrusion from Riggs disease. In Riggs disease the teeth are forced out of
Verhandlungen des XInternationalen medicinischen congresses, Berlin, 1890 . -dition noticed by all who have introduced artificial dentures in suchmouths. That this anterior protrusion is noticed only in persons at orpast middle age strengthens this theory. Points of diagnosis: 1. Facial angle normal. 2. Alveolar process normal. 3. Lower maxilla normal. 4. Upper incisors more or less protruding and diverging. 5. Bite shorter than normal. 6. Posterior teeth loose. Tartar may or may not be Anterior protrusion from Riggs disease. In Riggs disease the teeth are forced out of their sockets verygradually, so that the change in the contour of the mouth takes placeimperceptibly. The roots of the teeth are divided on the outside ofthe jaw, showing the action of the tartar from this direction. Itsaction in forcing the tooth out is not unlike that of an instrumentinserted between a bottle and a stopper. As the teeth project fromtheir sockets the occlusion is impaired. The distance between thejaws when at rest being practically the same, while the upper or the. Fig. 6. lower or both incisors are lengthening, the angle at which they strikeeach other, must necessarilv become more acute. In the occlusion oftwo normal arches we have an angle that is decidedly obtuse. Thebase of this triangle (the distance between the jaws when at rest)being the same, while the sides, the upper and lower incisors, are leng-thened, it follows that these must meet at an angle that becomesacute in proportion to the lengthening of the teeth. It is owing tothis changed relation of the teeth to each other and to the distancebetween the jaws that protrusion is effected. In these cases the facial Talbot, Irregularities of the teeth. 115 angle remains virtually the same, the alveolar process is diseased, thestate of the lower maxilla has nothing to do with the defect. Bothupper and lower incisors protrude in proportion to the extent of thedisease. The gums are chiefly affected as every
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