218 MECHANICAL APPLIANCES 



Mr. Tomes's " Manual." Or for the purpose of 

 drawing back a bicuspid, the spring is brought 

 round to the anterior portion of the tooth, and the 

 end bent, so as to bear tightly on the median sur- 

 face. It is occasionally very useful, and has the 

 advantages of being clean and easily removed. 



Some models, with the instruments used by Mr. 

 Sercombe, to whom I am indebted for their loan, 

 illustrate the plans he adopted for expanding the 

 arch of the mouth, somewhat, I believe, after that 

 described in one of the American journals. By 

 means of two gold plates fitted to the grinding sur- 

 faces of the bicuspids and first molars, and con- 

 nected by a spiral spring keeping up a constant 

 pressure outwards, he afterwards fitted a bone 

 plate to the hard palate; on to the bone was 

 riveted a piece of metal, to which was soldered 

 four grooved pieces, for the purpose of carrying- 

 compressed hiccory in order to force the anterior 

 teeth forward. And another case, in which he 

 succeeded in drawing into line a lateral incisor 

 and cuspid by means of a bone-piece, to which 

 he attached elastic bands, one passing through 

 a hole cut in the bone for the purpose of keeping 

 the band on the cuspid, which was only partially 

 erupted. 



Another illustration Mr. Sercombe has kindly 

 favoured me with, for drawing the central incisors 

 back. It consists of capping the two first molars, 

 and connecting the caps by means of a gold bar 



