32 



AXI.MAl. DK.v'riSTRV 



The I'lrst superior molar a\era<4es 48 milliiiietcrs 1<mi<^. 

 the second 55 milHineters, the third yi^ millimeters, the fourth 

 68 millimeters, the hfth 65 millimeters, and the sixtii 60 to 

 63 millimeters. 



The inferior molars are somewhat longer and much more 

 flattened than the superior ones. In volume, tooth for tooth, 

 the superior ones greatly exceed them. Their surfaces are 

 smoother, their borders less distinct, and the longitudinal 

 ridges less j^romincnt. The longitu(hnal ridges of the 



WW SZ 



Z5 M.M. 



Fig. 16. 



Tabic Surface of a Supcrifir Alolar, 



witli Measurement. 



Fig. 17 



Arrangement of tlic Dental Tissues 



on tlie Talile of a .Superior 



Alolar. 



I, 2. Infundibula. 



3. Crusta petrosa. 



4. l^entine. 



5. Enamel. 



internal or lingual surface are three in number and termi- 

 nate at the tables in sharp enamel points similar to 

 the external ones of the superior molars. The tables present 

 the same dental substances as the superior, but the enamel 

 is arranged in the form of an irregular figure, and not in 

 the shape of the letter "B," as on the superior tables. The 

 enamel is but a single organ and is not divided into internal 

 and external enamel, as in the incisors and superior molars. 

 This arrangement leaves the inferior molars without per- 

 fectl}' inclosed infundibula and allows all the crusta petrosa 



