THIRTY YEARS. 



121 



Fig. 124. 



Thirty Years (Figs. 122, 123, 124).— This plate shows the char- 

 acter of extreme old ag-e. In front, the superior incisive arch overlaps 

 the inferior, Aviiich has become considerably narrower ; the convergence 

 of the corner and intermediate teeth becomes more marked. In i)rofile, 

 the inferior incisors are almost horizontal, especially the corner ones; 

 the jaws are thinned and are wider a]):irt from each other in the region 

 of the bars. The tables of the inferior teeth are flattened from side to 

 side (biangnlar). The peripheral enamel has almost disappeared from 

 the posterior border of the teeth. In the np|)er jaw the tables are flat- 

 tened from side to side and the enamel is nearly worn away. Sometimes 

 in one or in both jaws the teeth have acquired an extreme length and 

 are not leveled ; or, at other times they are worn away almost to the 

 roots and level with the gums, and are surrounded by a large deposit 

 of the radical cement which covers the dentine, while the enamel has 

 entirely disappeared. 



