OPERATIONS ON THE MOUTH, PHARYNX, ETC. 137 



by a iew lateral movements, and ^\■ithdra\\■n by being pulled 

 in a direction which is contmuous with the fang or fangs. 

 If pulled in a direction out of this straight line, unless the 

 tooth is \'ery loose, the crown is apt to be broken off. 

 Canines are probably the most difficult to extract, and milk- 

 teeth always require \'ery delicate handling, or they will 

 break off and a portion be left in the gum. A mouth 

 speculum may or may not have to be used, depending upon 

 the position and condition of the tooth to be extracted. 



Fiy. 106. — Different Patterns of Tooth Forceps. 



When a general anaesthetic is administered, care must be 

 taken that neither blood nor an}' other foreign body finds its 

 way down the trachea. 



Insertion of False Teeth. 



This has been twice successfully attempted.^ 



The first subject was an aged Schipperke (see Fig. 109), whose teeth 

 had almost all disappeared. The only remaining ones were four canines, 

 the four carnassial molars, and a few very loose incisors. The latter 

 were extracted, and impressions taken of the mouth. A set of false teeth 

 was made, and fitted in with springs and wires in the same way as in 

 human dentistry. JMost of this had to be done under chloroform, as the 

 patient was very intractable. 



Twenty-four teeth only were used (six incisors, six molars and pre- 

 molars in each jaw), it not being thought worth while to restore the small 



' Journal of Co/nparativc Pathology and Therapeutics, vol. x., pp. 294 

 and 362 (Mosely and Hobday). 



