198 



ANIMAL DENTISTRY. 



retract and elevate it, then work the file with the right hand. 

 (See Figs. 141-137.) 



To blunt the left first superior molar place the right hand 

 in the left commissure, between the cheek and teeth, then 

 pass the twelve-inch file through the interdental space from 

 the opposite side to the finger tips of the right hand. Work 

 the file with the left hand and guide it with the finger tips of 

 the right. Change the position to blunt the anterior end of 



Fig. 138. 

 Second Position of the Hands and File to Blunt the Left First Superior 



Molar. 



the tooth, as follows : Place the palm of the left hand over 

 the nose and with the thumb retract and elevate the com- 

 missure of the mouth, then work the file with the right hand 

 as in filing the opposite side. (See Fig. 138.) 



To bevel the right first inferior molar place the palm of 

 the left hand on the inferior border of the lower jaw, and re- 

 tract and depress the commissure with the thumb, then work 

 the file with the right hand. (Fig. 139.) Change the position 



