VETERINARY DENTAL SURGERY. 169 



to wound either Steno's duct or the submaxillary 

 artery. Division of the former will result in a 

 fistula of the duct and the latter will cause more or 

 less trouble before the haemorrhage can be stopped. 

 Should the latter condition occur the artery may be 

 taken up and ligated, or it may be twisted and held 

 for a moment when the bleeding will have been 

 completely checked. After the operation of tre- 

 phining has been completed, should the muscle 

 which has been divided at the side of the jaw close 

 the opening so that the pus which forms cannot 

 escape freely, a portion of it may be excised. The 

 insertion of a large drainage tube will convey any 

 matter which forms, and is perhaps preferable. The 

 tube will have to be removed at each dressing of the 

 wound and if again inserted should be thoroughly 

 cleansed. It is best however to use new tubing at 

 each dressing. 



Superficial fracture and necrosis of the lower 

 jaw occurs very frequently and may be due to a 

 variety of causes. On this subject Professor Wil- 

 liams says : " Superficial fractures of the lower jaw 

 occur from severe curbs and bits; anteriorally and 

 from within the mouth from the bit, posteriorally 

 and under the jaw from the curb." 



SYMPTOMS FROM INJURIES OF THE BIT. 



Dribbling of saliva from or foaming in the mouth. 

 Animal shy or perhaps vicious if the mouth is touched ; 



