32 



ANIMAL DENTISTRY. 



The fii'st superior molar averages 48 millimeters long, 

 the second 55 millimeters, the third 73 millimeters, the fourth 

 68 millimeters, the fifth 65 millimeters, and the sixth 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 prominent. The longitudinal ridges of the 



WW SZ 



Z5 M.M. 



Fig. 16. Fig. 17. 



Table Surface of a Superior Molar, Arrangement of the Dental Tissues 

 with Measurement. on the Table of a Superior 



Molar. 

 I, 2. Infundibula. 



3. Crusta petrosa. 



4. Dentine. 



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- 

 fectly inclosed infundibula and allows all the crusta petrosa 



