238 VE TERINAR T DENTAL S URGER T. 



To manipulate the instrument, first heat the cylin- 

 der, then by pressure on the ball with the thumb a 

 current of hot air is forced into the cavity, which has 

 been first dried with bibulous paper. This soon 

 dries it perfectly, the walls of the cavity becoming 

 white as it dries. We now have our cavity ready 

 for the introduction of the filling. 



In preparing amalgam for introduction, put a 

 sufficient quantity in a mortar, add mercury sufficient 

 to give the requisite plasticity, and then wash thor- 

 oughly to remove the oxide formed during the com- 

 bination of the metals. 



The excess of mercury can be removed by press- 

 ing the paste in a piece of chamois or between the 

 thumb and finger with a rolling or rocking motion. 

 After the mercury has been pressed out, break up in- 

 to small pieces and insert into the cavity pressing 

 down each piece firmly until the cavity is full, when 

 it should be finished with the corundum points or 

 disks, Fig. 60, and followed by the burnisher. 

 Burnishing is done by rubbing the round smooth 

 surface over the filling until it is perfectly smooth 

 and bright. 



In filling the molars the same course is followed, 

 but we find it often necessary to cast the animal so 

 as to obtain light, and confine the head in position 

 suitable for work ; we also find it necessary to use a 

 speculum to keep the mouth open. There are a 



