PATHOLOGY OF THE INCISORS. 



79 



structural disease I have noticed has been, in one case, the 

 development of a tumour from the cement at the neck of one 

 of the lower incisors. The tumour was about the size of a 

 walnut, and in structure approached as much the characters 

 of true bone as any specimen of cement which may be ex- 

 amined. Such a growth is easily knocked off with a chisel 



The position of the incisors is subject to some deviations 

 from the normal state. This is well illustrated by Fig. 43, 



Pig. 43. 



which represents a peculiar curling in of the alveoli, and con- 

 sequent contracted appearance of the arch of the teeth. This 

 is certainly rare, and more commonly do we find anomalies 

 as to number. 



Fig. 44 indicates one of the very common irregularities 

 which give a still more peculiar appearance to the mouth 

 when the teeth over-ride each other, and as many as eleven, 



