Foil REDUCING IRREGULARITY. 217 



within the upper, being previously more than 

 double that distance beyond the upper teeth. 



This I adopted in preference to the strap on 

 the chin and strong elastic bands carried to the 

 back of the head, which I had found considerably 

 increased the inconvenience to the patient, and 

 was much less effective in its operation. 



Another plan is sometimes used for the upper 

 central incisors, where, from the persistence of the 

 temporary teeth, the permanent have made their 

 appearance considerably on the lingual side of the 

 alveolar ridge. This is very simply remedied by 

 means of a piece of bone fitted against and rather 

 beyond the edges of the growing teeth, which, as 

 they descend, the thicker part of the teeth rubbing 

 against the bone, forces them forward into their 

 proper line. Nature might possibly correct this 

 state, if the under teeth did not interfere on closing 

 the mouth. A case in illustration of this method 

 has been kindly lent me by Mr. Harrison. 



A very useful and efiective method of sus- 

 taining pressure on any part of a tooth is 

 frequently resorted to, especially for the pur- 

 pose of turning it, by means of a piece of flat 

 gold spring soldered to a gold plate. A specimen 

 has kindly been lent me, showing how the 

 pressure has been directed on the edge of the 

 central incisor. It is likewise of use for pressing 

 the teeth apart to obtain space. A case of this 

 description will be found most ably described in 



