ANIMAL DENTISTRY. 



197 



of passing the left hand into the interdental space, through 

 the right commissure, grasping the free end of the tongue 

 firmly with the fingers and then passing it gently out of the 

 opposite commissure. In this position the float is worked 

 with the right hand, and the shaft is guided by the wrist, 

 which is slightly arched upward into the roof of the mouth. 

 The right inferior arcade is more dif^cult to float than the 

 others and as a result is usually found neglected posteriorly. 

 (See Fig. 136.) 



Fig. 137. 

 Position of the Hands and File to Blunt the Right First Superior Molar. 



To blunt the right first superior molar place the left hand 

 into the right cominissure between the cheek and the molar 

 arcades, then pass the twelve-inch file (in the right hand) 

 through the interdental space from the opposite commissure 

 to its finger tips. Work the file with the right hand and 

 guide it around the end and side of the arcade with the finger 

 tips of the left. Change positions to round the arcade an- 

 teriorly and internally as follows : Place the left hand to- 

 ward the nasal roof and the thumb into the commissure to 



